Diochus hibbsi, Irmler, 2017

Irmler, Ulrich, 2017, A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae), Beiträge Zur Entomologie = Contributions to Entomology 67 (1), pp. 1-62 : 12-13

Diochus hibbsi spec. nov.

urn:lsid:zoobank.org:act:FA01A055-A996-4C60-9FE8-6756FDFA9A36

Figs 17A–C , 38J , 42F

Type material: male Holotype: Ecuador: Sucumbios, Sacha Lodge (0°5'S, 76°5'W), 270 m elevation, collected by malaise trap, 4.– 14.3.1994, leg. Hibbs ( KNHM).

Paratypes: female, with same data as holotype ( UIC) ; female, same location and same collector, but 14.– 24.5.1994 ( KNHM) ; Peru: Tambopata Prov. 15 km NE Pto. Maldonado, 200 m elevation, liana fruit fall, female, 7.7.1989, leg. J. Ashe, R. Leschen ( KNHM) ; Madre de Dios, Tambopata , rotten figs, bamboo litter, 1 male, 2 females, 28.10.1983, leg. L.E. Watrous & G. Mazurek ( FMNH) ; Manu Prov., Parque Nat. Manu, Zona Res. , Rio Manu , Cocha Juarez , trail nr. Manu Lodge , flight intercept trap, male, 18.– 24.9.1991, leg. A. Hartman ( FMNH) .

Diagnosis: Among the species of this group, D. hibbsi is characterised by the bicoloured pronotum with black anterior half and lighter brown posterior half. Moreover, the long antennae differentiate it from the similarly large D. vicinus . The antennae of D. hibbsi are similarly long as in D. longicornis and are as long as head and of pronotum combined, whereas in D. vicinus antennae are only as long as head and half of pronotum combined. The thick globular seminal vesical of the endophallus is also characteristic within the group and the paramere has a specific shape.

Description: Length: 4.5 mm. Colouration: brown; pronotum light brown with anterior half darkened; head and elytra blackish; posterior margin of elytra lighter brown; legs and antennae yellowish.

Head: 0.71 mm long, 0.52 mm wide; eyes slightly prominent; large; temples 1.5 times as long as eyes; EL: HL = 0.29; temples slightly divergent; PW: EW = 1.14; posterior angles widely rounded; posterior margin nearly semi-circular; impunctate midline convergent from clypeus to posterior vertex; adjacent to midline with row of seven setiferous punctures; additional irregular lines of setiferous punctures on supraocular area; punctures differing in size; postocular area more densely punctate; without microsculpture; surface polished.

Antennae nearly as long as head and pronotum combined; first antennomere thicker than following antennomeres; second antennomere twice as long as apical width; third antennomere three times as long as apical width; following antennomeres longer than wide, but with decreasing length; fourth antennomere 1.4 times as long as wide; tenth antennomere only 1.1 times as long as wide; all antennomeres densely pubescent and with few apical setae.

Pronotum: 0.77 mm long, 0.66 mm wide; slightly divergent to posterior angles; anterior angles widely and evenly rounded; posterior angles obtusely rounded; lateral margin weak; in dorsal aspect visible in posterior half; setiferous punctation sparse and moderately deep; along impunctate midline three pairs of punctures; interstice between anterior pair of punctures more than twice as wide as interstices between posterior two pairs; on lateral disc and along lateral margin few more setiferous punctures; very sparse micro-punctation between larger setiferous punctures; without microsculpture; surface polished.

Elytra 0.81 mm long, 0.92 mm wide; sides divergent from shoulders to posterior angles; width at posterior angles 1.3 times as wide as at shoulders; shoulders forming obtuse angles; posterior margin with triangular emargination; setiferous punctation in irregular rows of six to eight punctures; inner row adjacent to suture and three additional rows on disc; with moderately deep coriaceous ground sculpture; surface less shiny than pronotum and head.

Abdomen densely pubescent.

Aedeagus thick; seminal vesical of endophallus slightly oval, but nearly globular; basal inner duct looped; ending in sclerotised funnel; apical inner duct with one coil; paramere not projecting central lobe; in basal shaft folded; apex rounded with two long setae and with asymmetic triangular process and another shorter triangular process in front of apex; with subapical transparent sensory area; several sensillae in medial shaft.

Spermatheca 0.33 mm long, 0.27 mm wide; bursa copulatrix in central position to coiled duct; coiled duct oval, but nearly globular.

Etymology: The species name honours the collector P. Hibbs, who extensively collected rove beetles in the Ecuadorian sub-montane rainforest at Sacha Lodge.

Figures

Figs 42: Fore-bodies of Diochus antennalis (A), D. tricolor (B), D. amazonensis (C), D. hermani (D), D. plaumanni (E), D. hibbsi (F), D. newtoni (G), D. novus (H); scale bar: 0.5 mm.

Figs 14–17: Diochus inornatus-group: of D. schuelkei (14), D. hermani (15), D. amazonenis (16), D. hibbsi (17); aedeagus (A),

Fig. 38: Spermathecae of Diochus longicornis-group: D. longicornis (A), D. tarsalis (B), D. ashei (C), D. guianensis (D), D. unicolor (E); Diochus inornatus-group: D. inornatus (F), D. hanagarthi (G), D. antennalis (lateral aspect H), D. hermani (I), D. hibbsi (J), D. newtoni (K), D. novus (L); scale bar: 0.1 mm.