Hydnobius, Schmidt, 1841

Peck, Stewart B. & Cook, Joyce, 2009, Review of the Sogdini of North and Central America (Coleoptera: Leiodidae: Leiodinae) with descriptions of fourteen new species and three new genera, Zootaxa 2102 (1), pp. 1-74 : 12-13

publication ID	https://doi.org/10.11646/zootaxa.2102.1.1
DOI	https://doi.org/10.5281/zenodo.5317192
persistent identifier	https://treatment.plazi.org/id/D718473F-EA14-0C06-FF1C-F995F4EE5267
treatment provided by	Felipe (2021-08-22 09:12:09, last updated by Plazi 2023-11-04 08:06:45)
scientific name	Hydnobius
status

Treatment

Key to North American species of Hydnobius View in CoL (males)

1 Parameres narrow in apical one-half, straight ( Figs. 18 View FIGURES 15–20 , 40 View FIGURES 37–42 ) ...................................................................................... 2

- Parameres not as above, broad, sinuate, or curved ( Figs. 25 View FIGURES 22–27 , 33 View FIGURES 29–35 , 48 View FIGURES 44–50 )......................................................................... 3

2 Median lobe of aedeagus gradually narrowing to acute apex ( Fig. 18 View FIGURES 15–20 ); internal sac with two elongate rows of dark setae ( Fig. 18 View FIGURES 15–20 ), setae also visible posteriorly when internal sac is inverted; antennomere 7 clearly broader than antennomere 8 ( Fig. 15 View FIGURES 15–20 ) .................................................................................................................................. H. substriatus View in CoL

- Median lobe of aedeagus abruptly narrowing to acute apex ( Fig. 40 View FIGURES 37–42 ); internal sac densely covered with small scalelike setae ( Fig. 40 View FIGURES 37–42 ); antennomere 7 narrow, hardly broader than antennomere 8 ( Fig. 37 View FIGURES 37–42 )......................... H. laticeps View in CoL

3 Parameres broad or sinuate ( Figs. 25 View FIGURES 22–27 , 33 View FIGURES 29–35 , 59 View FIGURES 55–61 ); transcontinental or eastern species..................................................... 4

- Parameres narrow and outwardly curved ( Figs. 48 View FIGURES 44–50 , 54 View FIGURES 52–54 ); western species .................................................................. 6

4 Parameres broad, with apical one-half concave medially ( Fig. 25 View FIGURES 22–27 ); small body size, length of pronotum + elytra less than 2.2 mm ................................................................................................................................................ H. pumilus View in CoL

- Parameres not as above, larger body size, length of pronotum + elytra greater than 2.2 mm..................................... 5

5 Parameres sinuate ( Fig. 33 View FIGURES 29–35 ); internal sac with a pair of sclerotized oblong lobes ( Fig. 33 View FIGURES 29–35 ), lobes may be visible also when internal sac is inverted; male protibial spur broad ( Fig. 31 View FIGURES 29–35 ) ........................................................... H. longidens View in CoL

- Parameres straight ( Fig. 59 View FIGURES 55–61 ); internal sac does not contain sclerotized lobes; male protibial spur unmodified............. ............................................................................................................................................................... H. autumnalis View in CoL

6 Mesoventrite with median carina..................................................................................................................... H. kiseri View in CoL

- Mesoventrite without median carina.......................................................................................................... H. acarinus View in CoL

Figures

FIGURES 15–20. Hydnobius substriatus. 15. Right antenna, dorsal view. 16. Mandibles, dorsal view. 17. Male right metafemur. 18. Aedeagus, dorsal view. 19. Female coxites and styli, ventral view. 20. Female sternite 8, ventral view. Scale bar = 0.3 mm (Fig. 19), 0.4 mm (Figs. 15, 16, 18, 20), 0.5 mm (Fig. 17).

FIGURES 37–42. Hydnobius laticeps. 37. Right antenna, dorsal view. 38. Mandibles, dorsal view. 39. Male right metafemur. 40. Aedeagus, dorsal view. 41. Female sternite 8, ventral view. 42. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 40–42), 0.4 mm (Figs. 37, 38), 0.5 mm (Fig. 39).

FIGURES 22–27. Hydnobius pumilus. 22. Right antenna, dorsal view. 23. Mandibles, dorsal view. 24. Male right metafemur. 25. Aedeagus, dorsal view. 26. Female sternite 8, ventral view. 27. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 23, 25–27), 0.4 mm (Fig. 22), 0.5 mm (Fig. 24).

FIGURES 29–35. Hydnobius longidens. 29. Right antenna, dorsal view. 30. Mandibles, dorsal view. 31. Male right protibia. 32. Male right metafemur. 33. Aedeagus, dorsal view. 34. Female sternite 8, ventral view. 35. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 34, 35), 0.4 mm (Figs. 29, 30, 33), 0.5 mm (Figs. 31, 32).

FIGURES 44–50. Hydnobius kiseri. 44. Right antenna, dorsal view. 45. Mandibles, dorsal view. 46. Male right mesotibia. 47. Male right metafemur. 48. Aedeagus, dorsal view. 49. Female sternite 8, ventral view. 50. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 48–50), 0.4 mm (Fig. 44), 0.5 mm (Figs. 45–47).

FIGURES 55–61. Hydnobius autumnalis. 55. Right antenna, dorsal view. 56. Mandibles, dorsal view. 57. Male right mesotibia. 58. Male right metafemur. 59. Aedeagus, dorsal view. 60. Female sternite 8, ventral view. 61. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 55, 59, 61), 0.4 mm (Figs. 57, 58, 60), 0.5 mm (Fig. 56).

FIGURES 52–54. Hydnobius acarinus. 52. Right antenna, dorsal view. 53. Male right metafemur and metatibia. 54. Aedeagus, dorsal view. Scale bar = 0.3 mm (Fig. 54), 0.4 mm (Fig. 52), 0.5 mm (Fig. 53).