taxonID	type	format	identifier	references	title	description	created	creator	contributor	publisher	audience	source	license	rightsHolder	datasetID
03C495232072FFBC4BAFFE67FCC59631.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563716/files/figure.png	https://doi.org/10.5281/zenodo.15563716	FIGURES 1‒9. Isoperla altaica Šámal, 1939. Russia, Siberia, Krasnoyarsk Krai, Khakassia, Bely Iyus River, Shira Lake basin. Egg. 1. Habitus, cleaned, without anchor, lateral. 2. Habitus with deeply embedded, mushroom-shaped anchor lateral. 3. Collar, longitudinal wavy ridges with small transverse projections, base with wavy ridge, lateral. 4. Anchor with small globular bodies in a peripheral area. 5. Posterior pole, a “multi-level” collar, a view from above. 6. Anterior pole, micropylar row, a view from above. 7. Oval orifices on raised, tunnel-shaped, and long sperm guides. 8. Chorion structure, orifices associated with FCI rosettes. 9. Uncleaned egg, an external membrane with scattered adhesive mushroom bodies.	FIGURES 1‒9. Isoperla altaica Šámal, 1939. Russia, Siberia, Krasnoyarsk Krai, Khakassia, Bely Iyus River, Shira Lake basin. Egg. 1. Habitus, cleaned, without anchor, lateral. 2. Habitus with deeply embedded, mushroom-shaped anchor lateral. 3. Collar, longitudinal wavy ridges with small transverse projections, base with wavy ridge, lateral. 4. Anchor with small globular bodies in a peripheral area. 5. Posterior pole, a “multi-level” collar, a view from above. 6. Anterior pole, micropylar row, a view from above. 7. Oval orifices on raised, tunnel-shaped, and long sperm guides. 8. Chorion structure, orifices associated with FCI rosettes. 9. Uncleaned egg, an external membrane with scattered adhesive mushroom bodies.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232072FFB94BAFFA53FB0391A9.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563720/files/figure.png	https://doi.org/10.5281/zenodo.15563720	FIGURES 10‒17. Isoperla asiatica Raušer, 1968. Russia, Far East, Primorsky Krai, Barabashevka River. 10. Habitus, cleaned, with anchor, lateral. 11. Habitus, cleaned, without anchor, lateral. 12. Anchor, mushroom-shaped with globular bodies near the edge, lateral. 13. Collar with irregular longitudinal ridges, lateral. 14. Anterior pole, a view from above. 15. Posterior pole, collar with deeply serrated rim, a view from above. 16. Chorion structure. 17. Micropylar row, canal tunnel-shaped, and long, floating over the orifice and slightly covering it.	FIGURES 10‒17. Isoperla asiatica Raušer, 1968. Russia, Far East, Primorsky Krai, Barabashevka River. 10. Habitus, cleaned, with anchor, lateral. 11. Habitus, cleaned, without anchor, lateral. 12. Anchor, mushroom-shaped with globular bodies near the edge, lateral. 13. Collar with irregular longitudinal ridges, lateral. 14. Anterior pole, a view from above. 15. Posterior pole, collar with deeply serrated rim, a view from above. 16. Chorion structure. 17. Micropylar row, canal tunnel-shaped, and long, floating over the orifice and slightly covering it.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232077FFB94BAFFD2BFB299495.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563728/files/figure.png	https://doi.org/10.5281/zenodo.15563728	FIGURES 18‒23. Isoperla eximia Zapekina-Dulkeit, 1975. Russia, Far East, Jewish Autonomous Region, Kuldur River, Amur R. basin. 18. Habitus, with anchor and micropylar row, lateral. 19. Collar and mushroom-shaped anchor with grouped globular bodies, covered anchor evenly, lateral. 20. Posterior pole, collar with wide smooth shoulder limited by ring, a view from above. 21. Anterior pole, micropylar row, orifices surrounded with rosettes of FCI, view from above and lateral. 22. Chorion structure. 23. Orifices, setting in small oval cup-like depressions with long, smooth, and open sperm guides extending from cup rims, sperm guides slanted, lateral.	FIGURES 18‒23. Isoperla eximia Zapekina-Dulkeit, 1975. Russia, Far East, Jewish Autonomous Region, Kuldur River, Amur R. basin. 18. Habitus, with anchor and micropylar row, lateral. 19. Collar and mushroom-shaped anchor with grouped globular bodies, covered anchor evenly, lateral. 20. Posterior pole, collar with wide smooth shoulder limited by ring, a view from above. 21. Anterior pole, micropylar row, orifices surrounded with rosettes of FCI, view from above and lateral. 22. Chorion structure. 23. Orifices, setting in small oval cup-like depressions with long, smooth, and open sperm guides extending from cup rims, sperm guides slanted, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232077FFB94BAFFD2BFB299495.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563730/files/figure.png	https://doi.org/10.5281/zenodo.15563730	FIGURES 24‒27. Isoperla eximia Zapekina-Dulkeit, 1975. Japan, Hokkaido, Churui River basin, near Shibetsu town. 24. Habitus, with collar and micropylar row, lateral. 25. Collar with wide shoulder and ring. 26. Chorion structure. 27. Micropylar row, orifices, sperm guides, lateral.	FIGURES 24‒27. Isoperla eximia Zapekina-Dulkeit, 1975. Japan, Hokkaido, Churui River basin, near Shibetsu town. 24. Habitus, with collar and micropylar row, lateral. 25. Collar with wide shoulder and ring. 26. Chorion structure. 27. Micropylar row, orifices, sperm guides, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232075FFBB4BAFFB71FE709443.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563734/files/figure.png	https://doi.org/10.5281/zenodo.15563734	FIGURES28–34.Isoperla flavescens Zhiltzova &Potikha,1986.Russia,FarEast, PrimorskyKrai, LazovkaRiver, Partizanskaya R. basin. Egg, cleaned. 28. Habitus, with anchor, lateral. 29. Habitus with collar, micropylar row, and rosettes, lateral. 30. Mushroom-shaped anchor with small globular bodies, lateral. 31. Collar with irregular longitudinal ridges, rim incised, and flanged, lateral. 32. Collar, longitudinal ridges extending onto the shoulder with a ring, view from above. 33. Chorion structure. 34. Orifices and weakly visible sperm guides.	FIGURES28–34.Isoperla flavescens Zhiltzova &Potikha,1986.Russia,FarEast, PrimorskyKrai, LazovkaRiver, Partizanskaya R. basin. Egg, cleaned. 28. Habitus, with anchor, lateral. 29. Habitus with collar, micropylar row, and rosettes, lateral. 30. Mushroom-shaped anchor with small globular bodies, lateral. 31. Collar with irregular longitudinal ridges, rim incised, and flanged, lateral. 32. Collar, longitudinal ridges extending onto the shoulder with a ring, view from above. 33. Chorion structure. 34. Orifices and weakly visible sperm guides.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C49523207BFFB54BAFFF46FF789736.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563738/files/figure.png	https://doi.org/10.5281/zenodo.15563738	FIGURES 35–40. Isoperla kozlovi Zhiltzova, 1972. Russia, Far East, Amurskaya Oblast, Bureya River, Amur R. basin, Novobureysk settlement. Egg, cleaned. 35. Habitus, with micropylar row, orifices surrounded by rosettes, lateral. 36. Anchor and collar, lateral. 37. Posterior pole with mesh collar, view from above. 38. Anterior pole, convex, view from above. 39. Mesh of the collar, lateral. 40. Orifices in small oval depressions with short sperm guides.	FIGURES 35–40. Isoperla kozlovi Zhiltzova, 1972. Russia, Far East, Amurskaya Oblast, Bureya River, Amur R. basin, Novobureysk settlement. Egg, cleaned. 35. Habitus, with micropylar row, orifices surrounded by rosettes, lateral. 36. Anchor and collar, lateral. 37. Posterior pole with mesh collar, view from above. 38. Anterior pole, convex, view from above. 39. Mesh of the collar, lateral. 40. Orifices in small oval depressions with short sperm guides.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C49523207BFFB44BAFFB56FA8593D5.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563742/files/figure.png	https://doi.org/10.5281/zenodo.15563742	FIGURES 41‒47. Isoperla lunigera (Klapálek, 1923). Russia, Far East, Primorsky Krai, Ussuri River, near Stepanovka village, Amur River basin. Egg. 41. Habitus, lateral. 42. Anchor and collar, lateral. 43. Posterior pole with collar, view from above. 44. Collar, low, with empty pits between low longitudinal ridges, extending to rim. 45. Orifices in small oval depressions and sperm guides. 46. Anterior pole with convex apex, view from above. 47. Chorion structure with shallow punctations and tiny donutshaped rounded knobs.	FIGURES 41‒47. Isoperla lunigera (Klapálek, 1923). Russia, Far East, Primorsky Krai, Ussuri River, near Stepanovka village, Amur River basin. Egg. 41. Habitus, lateral. 42. Anchor and collar, lateral. 43. Posterior pole with collar, view from above. 44. Collar, low, with empty pits between low longitudinal ridges, extending to rim. 45. Orifices in small oval depressions and sperm guides. 46. Anterior pole with convex apex, view from above. 47. Chorion structure with shallow punctations and tiny donutshaped rounded knobs.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232078FFB64BAFFF46FC0A9712.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563746/files/figure.png	https://doi.org/10.5281/zenodo.15563746	FIGURES 48–55. Isoperla maculata Zhiltzova, 1977. Russia, Far East, Khabarovsk Krai,Anyuisky National Park,Anyui River, Nilo Chanell, Amur R. basin. Egg. 48. Uncleaned, habitus with anchor, extrachorion layer with mushroom bodies over FCIs, lateral. 49. Cleaned, habitus with collar lateral. 50. Posterior pole, collar rim view from above. 51. Anterior pole with concave apex. 52. Orifice round, lateral. 53. Anchor with globular bodies, lateral. 54. Collar with irregular and raised longitudinal ridges, lateral. 55. Micropyle row on raised, tunnel-shaped, and relatively long and weakly visible sperm guides; chorion structure, and orifices, lateral.	FIGURES 48–55. Isoperla maculata Zhiltzova, 1977. Russia, Far East, Khabarovsk Krai,Anyuisky National Park,Anyui River, Nilo Chanell, Amur R. basin. Egg. 48. Uncleaned, habitus with anchor, extrachorion layer with mushroom bodies over FCIs, lateral. 49. Cleaned, habitus with collar lateral. 50. Posterior pole, collar rim view from above. 51. Anterior pole with concave apex. 52. Orifice round, lateral. 53. Anchor with globular bodies, lateral. 54. Collar with irregular and raised longitudinal ridges, lateral. 55. Micropyle row on raised, tunnel-shaped, and relatively long and weakly visible sperm guides; chorion structure, and orifices, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232078FFB64BAFFBB2FA8D94BA.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563750/files/figure.png	https://doi.org/10.5281/zenodo.15563750	FIGURES 56–62. Isoperla mongolica Zhiltzova, 1972. Russia, West Siberia, Altai Republic, Tuekta River, Ob River basin. Egg. 56. Habitus lateral. 57. Anchor with globular bodies, lateral. 58. Collar, lateral. 59. Posterior pole with collar, view from above. 60. Anterior pole, chorion structure, micropylar row, orifices surrounded by rosettes, lateral. 61. Chorion structure thickened, slightly elevated ridges, and numerous deep pits. 62. Orifices in small, oval, cup-like depressions, sperm guides are tunnel-shaped and wider than ridges.	FIGURES 56–62. Isoperla mongolica Zhiltzova, 1972. Russia, West Siberia, Altai Republic, Tuekta River, Ob River basin. Egg. 56. Habitus lateral. 57. Anchor with globular bodies, lateral. 58. Collar, lateral. 59. Posterior pole with collar, view from above. 60. Anterior pole, chorion structure, micropylar row, orifices surrounded by rosettes, lateral. 61. Chorion structure thickened, slightly elevated ridges, and numerous deep pits. 62. Orifices in small, oval, cup-like depressions, sperm guides are tunnel-shaped and wider than ridges.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C49523207DFFB34BAFFF46FE29956F.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563752/files/figure.png	https://doi.org/10.5281/zenodo.15563752	FIGURES 63–70. Isoperla obscura (Zetterstedt, 1840). Russia, Siberia, Republic of Buryatia, Selenga River, settlement Tataurovo. Egg, cleaned. 63. Habitus, with collar and micropylar row, lateral. 64. Habitus, with anchor, lateral. 65. Collar with rough ring, lateral. 66. Anchor plate, covered with globular bodies, lateral. 67. Micropylar row, lateral. 68. Chorion evenly covered with small and deep pits, lateral. 69. Orifice in oval, cup-like depressions; sperm guides are tunnel-shaped and long. 70. Smooth chorion without punctations around orifice, lateral.	FIGURES 63–70. Isoperla obscura (Zetterstedt, 1840). Russia, Siberia, Republic of Buryatia, Selenga River, settlement Tataurovo. Egg, cleaned. 63. Habitus, with collar and micropylar row, lateral. 64. Habitus, with anchor, lateral. 65. Collar with rough ring, lateral. 66. Anchor plate, covered with globular bodies, lateral. 67. Micropylar row, lateral. 68. Chorion evenly covered with small and deep pits, lateral. 69. Orifice in oval, cup-like depressions; sperm guides are tunnel-shaped and long. 70. Smooth chorion without punctations around orifice, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C49523207DFFAC4BAFF962FC0A913D.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563756/files/figure.png	https://doi.org/10.5281/zenodo.15563756	FIGURES 71–80. Isoperla ornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Shkotovka River. Egg. 71–72. Habitus, with collar, lateral. 73. Anchor with globular bodies, lateral. 74–75. Collar with irregular and raised longitudinal ridges and a flanged rim, base offset with pits. 76. Orifice in a small, oval, cup-shaped depression; sperm guide is poorly visible. 77. Micropyles row weakly visible, orifices located singularly on follicle cell ridges. 78. Anterior pole with concave apex, view from above. 79. Posterior pole, with collar, view from above. 80. Chorion structure, lateral.	FIGURES 71–80. Isoperla ornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Shkotovka River. Egg. 71–72. Habitus, with collar, lateral. 73. Anchor with globular bodies, lateral. 74–75. Collar with irregular and raised longitudinal ridges and a flanged rim, base offset with pits. 76. Orifice in a small, oval, cup-shaped depression; sperm guide is poorly visible. 77. Micropyles row weakly visible, orifices located singularly on follicle cell ridges. 78. Anterior pole with concave apex, view from above. 79. Posterior pole, with collar, view from above. 80. Chorion structure, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232062FFAC4BAFFD5FFCD896C1.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563758/files/figure.png	https://doi.org/10.5281/zenodo.15563758	FIGURES 81–89. Isoperla pseudornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Ryazanovka River, near the hunting grounds. Egg. 81. Habitus, with anchor and micropylar row, lateral. 82. Habitus, with collar, lateral. 83. Anchor with globular bodies, lateral. 84. Collar with irregular and raised longitudinal ridges and flanged rim. 85. Posterior pole with shallow embedded anchor, view from above. 86. Anterior pole with slightly concave apex, view from above. 87. Posterior pole, with collar, smooth shoulder surrounded with a row of pits, view from above. 88. Chorion structure, lateral. 89. Micropylar row, orifices located on the top of FCI ridges, sperm guides are short and thickened.	FIGURES 81–89. Isoperla pseudornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Ryazanovka River, near the hunting grounds. Egg. 81. Habitus, with anchor and micropylar row, lateral. 82. Habitus, with collar, lateral. 83. Anchor with globular bodies, lateral. 84. Collar with irregular and raised longitudinal ridges and flanged rim. 85. Posterior pole with shallow embedded anchor, view from above. 86. Anterior pole with slightly concave apex, view from above. 87. Posterior pole, with collar, smooth shoulder surrounded with a row of pits, view from above. 88. Chorion structure, lateral. 89. Micropylar row, orifices located on the top of FCI ridges, sperm guides are short and thickened.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232062FFA94BAFF9C3FB5F90A5.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563763/files/figure.png	https://doi.org/10.5281/zenodo.15563763	FIGURES 90–98. Kaszabia nigricauda (Navás, 1923). Russia, Far East, Amurskaya Oblast, Norsky Nature Reserve, Nora River, cordon near Berezovoye Lake, Selemdzha-Zeya-Amur River basins. Egg. 90–91. Habitus, with collar, cross-shaped ridges, and micropylar row, lateral. 92. Anchor biscuit-shaped, flat, with large, single, globular bodies. 93. Collar covered with pits, extending to the rim, rim flanged and wavy. 94. Anterior pole with slightly concave apex, view from above. 95. Posterior pole with collar, view from above. 96. Orifices slightly elongated, sperm guides poorly visible, lateral. 97–98. Chorion surface uniformly and densely covered with numerous small punctations.	FIGURES 90–98. Kaszabia nigricauda (Navás, 1923). Russia, Far East, Amurskaya Oblast, Norsky Nature Reserve, Nora River, cordon near Berezovoye Lake, Selemdzha-Zeya-Amur River basins. Egg. 90–91. Habitus, with collar, cross-shaped ridges, and micropylar row, lateral. 92. Anchor biscuit-shaped, flat, with large, single, globular bodies. 93. Collar covered with pits, extending to the rim, rim flanged and wavy. 94. Anterior pole with slightly concave apex, view from above. 95. Posterior pole with collar, view from above. 96. Orifices slightly elongated, sperm guides poorly visible, lateral. 97–98. Chorion surface uniformly and densely covered with numerous small punctations.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563716/files/figure.png	https://doi.org/10.5281/zenodo.15563716	FIGURES 1‒9. Isoperla altaica Šámal, 1939. Russia, Siberia, Krasnoyarsk Krai, Khakassia, Bely Iyus River, Shira Lake basin. Egg. 1. Habitus, cleaned, without anchor, lateral. 2. Habitus with deeply embedded, mushroom-shaped anchor lateral. 3. Collar, longitudinal wavy ridges with small transverse projections, base with wavy ridge, lateral. 4. Anchor with small globular bodies in a peripheral area. 5. Posterior pole, a “multi-level” collar, a view from above. 6. Anterior pole, micropylar row, a view from above. 7. Oval orifices on raised, tunnel-shaped, and long sperm guides. 8. Chorion structure, orifices associated with FCI rosettes. 9. Uncleaned egg, an external membrane with scattered adhesive mushroom bodies.	FIGURES 1‒9. Isoperla altaica Šámal, 1939. Russia, Siberia, Krasnoyarsk Krai, Khakassia, Bely Iyus River, Shira Lake basin. Egg. 1. Habitus, cleaned, without anchor, lateral. 2. Habitus with deeply embedded, mushroom-shaped anchor lateral. 3. Collar, longitudinal wavy ridges with small transverse projections, base with wavy ridge, lateral. 4. Anchor with small globular bodies in a peripheral area. 5. Posterior pole, a “multi-level” collar, a view from above. 6. Anterior pole, micropylar row, a view from above. 7. Oval orifices on raised, tunnel-shaped, and long sperm guides. 8. Chorion structure, orifices associated with FCI rosettes. 9. Uncleaned egg, an external membrane with scattered adhesive mushroom bodies.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563720/files/figure.png	https://doi.org/10.5281/zenodo.15563720	FIGURES 10‒17. Isoperla asiatica Raušer, 1968. Russia, Far East, Primorsky Krai, Barabashevka River. 10. Habitus, cleaned, with anchor, lateral. 11. Habitus, cleaned, without anchor, lateral. 12. Anchor, mushroom-shaped with globular bodies near the edge, lateral. 13. Collar with irregular longitudinal ridges, lateral. 14. Anterior pole, a view from above. 15. Posterior pole, collar with deeply serrated rim, a view from above. 16. Chorion structure. 17. Micropylar row, canal tunnel-shaped, and long, floating over the orifice and slightly covering it.	FIGURES 10‒17. Isoperla asiatica Raušer, 1968. Russia, Far East, Primorsky Krai, Barabashevka River. 10. Habitus, cleaned, with anchor, lateral. 11. Habitus, cleaned, without anchor, lateral. 12. Anchor, mushroom-shaped with globular bodies near the edge, lateral. 13. Collar with irregular longitudinal ridges, lateral. 14. Anterior pole, a view from above. 15. Posterior pole, collar with deeply serrated rim, a view from above. 16. Chorion structure. 17. Micropylar row, canal tunnel-shaped, and long, floating over the orifice and slightly covering it.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563728/files/figure.png	https://doi.org/10.5281/zenodo.15563728	FIGURES 18‒23. Isoperla eximia Zapekina-Dulkeit, 1975. Russia, Far East, Jewish Autonomous Region, Kuldur River, Amur R. basin. 18. Habitus, with anchor and micropylar row, lateral. 19. Collar and mushroom-shaped anchor with grouped globular bodies, covered anchor evenly, lateral. 20. Posterior pole, collar with wide smooth shoulder limited by ring, a view from above. 21. Anterior pole, micropylar row, orifices surrounded with rosettes of FCI, view from above and lateral. 22. Chorion structure. 23. Orifices, setting in small oval cup-like depressions with long, smooth, and open sperm guides extending from cup rims, sperm guides slanted, lateral.	FIGURES 18‒23. Isoperla eximia Zapekina-Dulkeit, 1975. Russia, Far East, Jewish Autonomous Region, Kuldur River, Amur R. basin. 18. Habitus, with anchor and micropylar row, lateral. 19. Collar and mushroom-shaped anchor with grouped globular bodies, covered anchor evenly, lateral. 20. Posterior pole, collar with wide smooth shoulder limited by ring, a view from above. 21. Anterior pole, micropylar row, orifices surrounded with rosettes of FCI, view from above and lateral. 22. Chorion structure. 23. Orifices, setting in small oval cup-like depressions with long, smooth, and open sperm guides extending from cup rims, sperm guides slanted, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563734/files/figure.png	https://doi.org/10.5281/zenodo.15563734	FIGURES28–34.Isoperla flavescens Zhiltzova &Potikha,1986.Russia,FarEast, PrimorskyKrai, LazovkaRiver, Partizanskaya R. basin. Egg, cleaned. 28. Habitus, with anchor, lateral. 29. Habitus with collar, micropylar row, and rosettes, lateral. 30. Mushroom-shaped anchor with small globular bodies, lateral. 31. Collar with irregular longitudinal ridges, rim incised, and flanged, lateral. 32. Collar, longitudinal ridges extending onto the shoulder with a ring, view from above. 33. Chorion structure. 34. Orifices and weakly visible sperm guides.	FIGURES28–34.Isoperla flavescens Zhiltzova &Potikha,1986.Russia,FarEast, PrimorskyKrai, LazovkaRiver, Partizanskaya R. basin. Egg, cleaned. 28. Habitus, with anchor, lateral. 29. Habitus with collar, micropylar row, and rosettes, lateral. 30. Mushroom-shaped anchor with small globular bodies, lateral. 31. Collar with irregular longitudinal ridges, rim incised, and flanged, lateral. 32. Collar, longitudinal ridges extending onto the shoulder with a ring, view from above. 33. Chorion structure. 34. Orifices and weakly visible sperm guides.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563750/files/figure.png	https://doi.org/10.5281/zenodo.15563750	FIGURES 56–62. Isoperla mongolica Zhiltzova, 1972. Russia, West Siberia, Altai Republic, Tuekta River, Ob River basin. Egg. 56. Habitus lateral. 57. Anchor with globular bodies, lateral. 58. Collar, lateral. 59. Posterior pole with collar, view from above. 60. Anterior pole, chorion structure, micropylar row, orifices surrounded by rosettes, lateral. 61. Chorion structure thickened, slightly elevated ridges, and numerous deep pits. 62. Orifices in small, oval, cup-like depressions, sperm guides are tunnel-shaped and wider than ridges.	FIGURES 56–62. Isoperla mongolica Zhiltzova, 1972. Russia, West Siberia, Altai Republic, Tuekta River, Ob River basin. Egg. 56. Habitus lateral. 57. Anchor with globular bodies, lateral. 58. Collar, lateral. 59. Posterior pole with collar, view from above. 60. Anterior pole, chorion structure, micropylar row, orifices surrounded by rosettes, lateral. 61. Chorion structure thickened, slightly elevated ridges, and numerous deep pits. 62. Orifices in small, oval, cup-like depressions, sperm guides are tunnel-shaped and wider than ridges.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563752/files/figure.png	https://doi.org/10.5281/zenodo.15563752	FIGURES 63–70. Isoperla obscura (Zetterstedt, 1840). Russia, Siberia, Republic of Buryatia, Selenga River, settlement Tataurovo. Egg, cleaned. 63. Habitus, with collar and micropylar row, lateral. 64. Habitus, with anchor, lateral. 65. Collar with rough ring, lateral. 66. Anchor plate, covered with globular bodies, lateral. 67. Micropylar row, lateral. 68. Chorion evenly covered with small and deep pits, lateral. 69. Orifice in oval, cup-like depressions; sperm guides are tunnel-shaped and long. 70. Smooth chorion without punctations around orifice, lateral.	FIGURES 63–70. Isoperla obscura (Zetterstedt, 1840). Russia, Siberia, Republic of Buryatia, Selenga River, settlement Tataurovo. Egg, cleaned. 63. Habitus, with collar and micropylar row, lateral. 64. Habitus, with anchor, lateral. 65. Collar with rough ring, lateral. 66. Anchor plate, covered with globular bodies, lateral. 67. Micropylar row, lateral. 68. Chorion evenly covered with small and deep pits, lateral. 69. Orifice in oval, cup-like depressions; sperm guides are tunnel-shaped and long. 70. Smooth chorion without punctations around orifice, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563738/files/figure.png	https://doi.org/10.5281/zenodo.15563738	FIGURES 35–40. Isoperla kozlovi Zhiltzova, 1972. Russia, Far East, Amurskaya Oblast, Bureya River, Amur R. basin, Novobureysk settlement. Egg, cleaned. 35. Habitus, with micropylar row, orifices surrounded by rosettes, lateral. 36. Anchor and collar, lateral. 37. Posterior pole with mesh collar, view from above. 38. Anterior pole, convex, view from above. 39. Mesh of the collar, lateral. 40. Orifices in small oval depressions with short sperm guides.	FIGURES 35–40. Isoperla kozlovi Zhiltzova, 1972. Russia, Far East, Amurskaya Oblast, Bureya River, Amur R. basin, Novobureysk settlement. Egg, cleaned. 35. Habitus, with micropylar row, orifices surrounded by rosettes, lateral. 36. Anchor and collar, lateral. 37. Posterior pole with mesh collar, view from above. 38. Anterior pole, convex, view from above. 39. Mesh of the collar, lateral. 40. Orifices in small oval depressions with short sperm guides.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563742/files/figure.png	https://doi.org/10.5281/zenodo.15563742	FIGURES 41‒47. Isoperla lunigera (Klapálek, 1923). Russia, Far East, Primorsky Krai, Ussuri River, near Stepanovka village, Amur River basin. Egg. 41. Habitus, lateral. 42. Anchor and collar, lateral. 43. Posterior pole with collar, view from above. 44. Collar, low, with empty pits between low longitudinal ridges, extending to rim. 45. Orifices in small oval depressions and sperm guides. 46. Anterior pole with convex apex, view from above. 47. Chorion structure with shallow punctations and tiny donutshaped rounded knobs.	FIGURES 41‒47. Isoperla lunigera (Klapálek, 1923). Russia, Far East, Primorsky Krai, Ussuri River, near Stepanovka village, Amur River basin. Egg. 41. Habitus, lateral. 42. Anchor and collar, lateral. 43. Posterior pole with collar, view from above. 44. Collar, low, with empty pits between low longitudinal ridges, extending to rim. 45. Orifices in small oval depressions and sperm guides. 46. Anterior pole with convex apex, view from above. 47. Chorion structure with shallow punctations and tiny donutshaped rounded knobs.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563746/files/figure.png	https://doi.org/10.5281/zenodo.15563746	FIGURES 48–55. Isoperla maculata Zhiltzova, 1977. Russia, Far East, Khabarovsk Krai,Anyuisky National Park,Anyui River, Nilo Chanell, Amur R. basin. Egg. 48. Uncleaned, habitus with anchor, extrachorion layer with mushroom bodies over FCIs, lateral. 49. Cleaned, habitus with collar lateral. 50. Posterior pole, collar rim view from above. 51. Anterior pole with concave apex. 52. Orifice round, lateral. 53. Anchor with globular bodies, lateral. 54. Collar with irregular and raised longitudinal ridges, lateral. 55. Micropyle row on raised, tunnel-shaped, and relatively long and weakly visible sperm guides; chorion structure, and orifices, lateral.	FIGURES 48–55. Isoperla maculata Zhiltzova, 1977. Russia, Far East, Khabarovsk Krai,Anyuisky National Park,Anyui River, Nilo Chanell, Amur R. basin. Egg. 48. Uncleaned, habitus with anchor, extrachorion layer with mushroom bodies over FCIs, lateral. 49. Cleaned, habitus with collar lateral. 50. Posterior pole, collar rim view from above. 51. Anterior pole with concave apex. 52. Orifice round, lateral. 53. Anchor with globular bodies, lateral. 54. Collar with irregular and raised longitudinal ridges, lateral. 55. Micropyle row on raised, tunnel-shaped, and relatively long and weakly visible sperm guides; chorion structure, and orifices, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563756/files/figure.png	https://doi.org/10.5281/zenodo.15563756	FIGURES 71–80. Isoperla ornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Shkotovka River. Egg. 71–72. Habitus, with collar, lateral. 73. Anchor with globular bodies, lateral. 74–75. Collar with irregular and raised longitudinal ridges and a flanged rim, base offset with pits. 76. Orifice in a small, oval, cup-shaped depression; sperm guide is poorly visible. 77. Micropyles row weakly visible, orifices located singularly on follicle cell ridges. 78. Anterior pole with concave apex, view from above. 79. Posterior pole, with collar, view from above. 80. Chorion structure, lateral.	FIGURES 71–80. Isoperla ornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Shkotovka River. Egg. 71–72. Habitus, with collar, lateral. 73. Anchor with globular bodies, lateral. 74–75. Collar with irregular and raised longitudinal ridges and a flanged rim, base offset with pits. 76. Orifice in a small, oval, cup-shaped depression; sperm guide is poorly visible. 77. Micropyles row weakly visible, orifices located singularly on follicle cell ridges. 78. Anterior pole with concave apex, view from above. 79. Posterior pole, with collar, view from above. 80. Chorion structure, lateral.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563758/files/figure.png	https://doi.org/10.5281/zenodo.15563758	FIGURES 81–89. Isoperla pseudornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Ryazanovka River, near the hunting grounds. Egg. 81. Habitus, with anchor and micropylar row, lateral. 82. Habitus, with collar, lateral. 83. Anchor with globular bodies, lateral. 84. Collar with irregular and raised longitudinal ridges and flanged rim. 85. Posterior pole with shallow embedded anchor, view from above. 86. Anterior pole with slightly concave apex, view from above. 87. Posterior pole, with collar, smooth shoulder surrounded with a row of pits, view from above. 88. Chorion structure, lateral. 89. Micropylar row, orifices located on the top of FCI ridges, sperm guides are short and thickened.	FIGURES 81–89. Isoperla pseudornata Zhiltzova, 1988. Russia, Far East, Primorsky Krai, Ryazanovka River, near the hunting grounds. Egg. 81. Habitus, with anchor and micropylar row, lateral. 82. Habitus, with collar, lateral. 83. Anchor with globular bodies, lateral. 84. Collar with irregular and raised longitudinal ridges and flanged rim. 85. Posterior pole with shallow embedded anchor, view from above. 86. Anterior pole with slightly concave apex, view from above. 87. Posterior pole, with collar, smooth shoulder surrounded with a row of pits, view from above. 88. Chorion structure, lateral. 89. Micropylar row, orifices located on the top of FCI ridges, sperm guides are short and thickened.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
03C495232066FFAB4BAFFCCEFA049164.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/15563763/files/figure.png	https://doi.org/10.5281/zenodo.15563763	FIGURES 90–98. Kaszabia nigricauda (Navás, 1923). Russia, Far East, Amurskaya Oblast, Norsky Nature Reserve, Nora River, cordon near Berezovoye Lake, Selemdzha-Zeya-Amur River basins. Egg. 90–91. Habitus, with collar, cross-shaped ridges, and micropylar row, lateral. 92. Anchor biscuit-shaped, flat, with large, single, globular bodies. 93. Collar covered with pits, extending to the rim, rim flanged and wavy. 94. Anterior pole with slightly concave apex, view from above. 95. Posterior pole with collar, view from above. 96. Orifices slightly elongated, sperm guides poorly visible, lateral. 97–98. Chorion surface uniformly and densely covered with numerous small punctations.	FIGURES 90–98. Kaszabia nigricauda (Navás, 1923). Russia, Far East, Amurskaya Oblast, Norsky Nature Reserve, Nora River, cordon near Berezovoye Lake, Selemdzha-Zeya-Amur River basins. Egg. 90–91. Habitus, with collar, cross-shaped ridges, and micropylar row, lateral. 92. Anchor biscuit-shaped, flat, with large, single, globular bodies. 93. Collar covered with pits, extending to the rim, rim flanged and wavy. 94. Anterior pole with slightly concave apex, view from above. 95. Posterior pole with collar, view from above. 96. Orifices slightly elongated, sperm guides poorly visible, lateral. 97–98. Chorion surface uniformly and densely covered with numerous small punctations.	2025-05-29	Teslenko, Valentina A.		Zenodo	biologists	Teslenko, Valentina A.			
