Agyneta minorata ( Chamberlin & Ivie 1944 )

Dupérré, Nadine, 2013, Taxonomic revision of the spider genera Agyneta and Tennesseellum (Araneae, Linyphiidae) of North America north of Mexico with a study of the embolic division within Micronetinae sensu Saaristo & Tanasevitch 1996, Zootaxa 3674 (1), pp. 1-189 : 162-163

Agyneta minorata ( Chamberlin & Ivie 1944)

Figs 24 , 538–545 , map 36

Meioneta minorata Chamberlin & Ivie 1944: 88 , f. 146. (Description 3). Agyneta minorata Buckle et al. 2001: 100 . (Transferred from Meioneta ).

Type material: Meioneta minorata Chamberlin & Ivie 1944 , 3 HOLOTYPE from Georgia: East side of Okefenokee Swamp, W 82º 5’: N 30º 50’, August 23, 1933, Wilton Ivie collector ( AMNH). EXAMINED.

Diagnosis: Males are distinguised from all other species in the genus by their flared, serrated lamella characteristica, pointed apically ( Fig. 538 ). Females are diagnosed from most species by the proximal part of scape wider medially ( Fig. 543 ) and the extremely large receptacula of the internal genitalia ( Fig. 544 ). They differ from A. minorata by the rounded epigynal slits ( Fig. 543 ), straight in the latter ( Fig. 535 ).

Description: Male: Total length 1.30; carapace length 0.63, width 0.47.

CEPHALOTHORAX: Carapace light yellow, shiny, finely reticulate; radiating lines, margin suffused with gray. Sternum light yellow, lightly suffused with gray. Clypeus height 2. Chelicerae light yellow, excavated; setatipped tubercles absent; promargin one extra large ( Fig. 24 ) and one small teeth, retromargin two denticles, retromargin with large triangular projection near base of fangs. Cheliceral stridulatory organ ~18 striae, well spaced throughout. ABDOMEN: Uniformly light gray, sometimes with off-white apical mark ( Fig. 542 ). LEGS: Light yellow; leg I total length: 2.08; leg III total length: 1.50; Tm I: 0.25, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis small, smooth; dorsal tibial apophysis absent; one retrolateral trichobothria and one dorsal ( Fig. 538 ). Cymbium rounded; glabrous depression absent ( Fig. 538 ); dorsal cymbial tubercle elongated, smooth; ventral tubercle absent; prolateral notch absent ( Fig. 539 ). Paracymbium apical pocket medium, anterior pocket absent but area rugose, posterior pocket absent ( Fig. 538 ). Embolus tip rounded, narrow; Fickert’s gland absent; ventral lamella with row of long spines; thumb highly reduced ( Fig. 540 ). Embolus proper set apically, dorsal part elongated and associated with tip of embolus ( Fig. 540 ). Anterior terminal apophysis narrow, tip with long protrusions; posterior terminal apophysis small not well sclerotized; lamella characteristica broad, serrated ( Fig. 541 ).

MAP. 36. Localities of Agyneta minorata ( Chamberlin & Ivie 1944) .

Female: Total length 1.27; carapace length 0.50, width 0.41.

CEPHALOTHORAX: Coloration as in male. Chelicerae light yellow; promargin five teeth, retromargin four denticles. Cheliceral stridulatory organ ~16 striae, well spaced throughout. ABDOMEN: As in male. LEGS: Same coloration as male; palpal tarsus normal, claw absent; leg I total length: 1.94; leg III total length: 1.51; Tm I: 0.31, Tm IV: absent. GENITALIA: Female epigynum with wide proximal part of scape, widest medially; epigynal slits elongated, oval; pit hook depression small ( Fig. 543 ); lateral lobes short and wide; stretcher absent; pit small ( Fig. 545 ). Median part of scape narrow and short; genital pores situated at the base of the lateral lobes pockets ( Fig. 545 ). Internal genitalia with large, to some extent triangular receptacula ( Figs 544, 545 ).

Other material examined: USA: Florida: Gainesville, 01–15. ix.1926, 13, Bratley ( AMNH). New York: Clarksburg, 18.ix.1925, 13, Crosby ( AMNH). West Virginia: West Virginia University Forest Ridge, Chestnut Ridge, pitfalls in mixed oak-hardwood, 0 1–08.v.1989, 131Ƥ, 0 8–15.v.1989, 133Ƥ, 15–22.v.1989, 836Ƥ, 22– 30.v.1989, 53, 30.v–05.vi.1989, 2231Ƥ, 12–19.vi.1989, 534Ƥ, 19–26.vi.1989, 131Ƥ, 26.vi–03.vii.1989, 235Ƥ, 0 3–10.vii.1989, 1638Ƥ, 10–17.vii.1989, 532Ƥ, D. Jennings ( USNM); West Virginia University Forest Ridge, Chestnut Ridge, pitfalls in mixed oak-hardwood, 0 1–08.v.1990, 1933Ƥ, 0 8–15.v.1990, 4135Ƥ, 15–22.v.1990, 5734Ƥ, 22–29.v.1990, 5137Ƥ, 29.v–05.vi.1990, 32310Ƥ, 0 5–12.vi.1990, 34316Ƥ, 12–19.vi.1990, 38315Ƥ, 19– 26.vi.1990, 20313Ƥ, 26.vi–03.vii.1990, 1334Ƥ, 0 3–10.vii.1990, 35311Ƥ, 10–17.vii.1990, 133Ƥ, D. Jennings ( AMNH).

Distribution: Eastern USA.

Figures

FIGURES 17 – 24. 17. Tennesseellum formicum (Emerton 1882), palp retrolateral view. 18. T. formicum, palp prolateral view. 19. T. formicum, female spinnerets anterior view. 20. T. formicum, male chelicerae lateral view. 21. Agyneta fabra (Keyserling 1886), male carapace anterior view. 22. Agyneta fillmorana (Chamberlin 1919), male carapace anterior view. 23. Agyneta parva (Banks 1896), male chelicerae anterior view. 24. Agyneta minorata (Chamberlin & Ivie 1944), male chelicerae anterior view.

FIGURES 538 – 545. Agyneta minorata (Chamberlin & Ivie 1944). 538 – 542, Male. 543 – 545, Female. 538. Palp, retrolateral view. 539. Palp, prolateral view. 540. Embolus, prolateral view. 541. Radical division, retrolateral view. 542. Abdomen, dorsal view. 543. Epigynum, dorsal view. 544. Internal genitalia, ventral view. 545. Internal genitalia, dorsal view.

FIGURES 529 – 537. Agyneta leucophora (Chamberlin & Ivie 1944). 529 – 533, Male. 534 – 537, Female. 529. Palp, retrolateral view. 530. Palp, prolateral view. 531. Embolus, prolateral view. 532. Radical division, retrolateral view. 533. 534. Abdomen, dorsal view. 535. Epigynum, dorsal view. 536. Internal genitalia, ventral view. 537. Internal genitalia, dorsal view.