Diochus ecuadoriensis, 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 : 21-22

Diochus ecuadoriensis spec. nov.

urn:lsid:zoobank.org:act:0B0B68AB-0348-412D-A77B-EA722A5130C9

Figs 21A–C , 39F , 43E

Type material: male, Holotype: Ecuador: Pichincha, Macquipucuna Station , 45 km NW Quito, 1600–1650 m elevation, Epiphyte litter, berlese, guava grove, 14.4.1990, leg. C. Carlton & R. Adarve ( KNHM).

Paratypes: 1 female with same data as holotype ( KNHM); same location, 50 km NW Quito , 1350 m elevation, epiphyte berlesate , 1 male, 2 females, 20.12.1991, leg. C. Carlton & R. Leschen ( KNHM, UIC); same location, same collector, 1650 m elevation, male, 21.12.1991 ( UIC); same location, N of field station, substrate berlesate, female, 20.12.1991, leg. C. Carlton ( KNHM); Napo Reg., Tiputini Res. Stat. (0°38'S, 76°09'W), 220 m elev., flight intercept trap , 1 male, 1 female, 5.– 25.9.2000, leg. D.J. Inward & K.A. Jackson # 2000-194 ( BMNH); Napo Prov., Baeza, near Rio Papallacta, 5800 ft. elev., litter near stream, male, 28.5.1993, leg. L. Herman ( AMNH); Napo Prov., 69 km NE Baeza, 15 km SW Reventador , litter, 4600 ft. elev., male, 28.– 30.10.1988, leg. L. Herman ( AMNH); Napo Prov., 15.6 km W of Baeza-El Chaco jct., on road to El Chaco, 7600 ft. elev ., 2 females, 30.5.1993, leg. L. Herman #2761 ( AMNH); Pichincha, Las Palmeras, old Quito Sto. Domingo Rd., km 59, 43 km NE Alluriquin , litter, 6400 ft. elev ., 1 female, 23.10.1988, leg. L. Herman ( AMNH); Pichincha, 17 km SE Sto. Domingo de Colorados, Tinalandia , litter, 3000 ft. elev ., 2 females,

16.– 21.10.1988, leg. L. Herman ( AMNH) .

Diagnosis: The species resembles D. brooksi and D. maculicollis by the bicoloured antennae. It can be easily distinguished from D. maculicollis by the dark blackish head and pronotum. D. ecuadoriensis mostly resembles D. brooksi in the dark blackish colour. The head of D. ecuadoriensis is much more elongate and with much denser microsculpture than in D. brooksi . It is nearly 1.4 times as long as wide, whereas it is nearly quadrate in D. brooksi . The aedeagi of the three species are very similar regarding the curved paramere clasping the central lobe. The parameres of D. ecuadoriensis have a central triangular process and in this respect, it resembles the paramere of D. maculicollis . However, the three long setae on the outer edge of the apical half are in a similar position as in D. brooksi and different from the shorter setae of D. maculicollis .

Description: Length: 3.5 mm. Colouration: unicoloured black; legs and antennae light brown; first to third antennomere light brown; fourth to seventh antennomere blackish; eighth light brown; ninth still lighter, dark yellowish; tenth yellow; last antennomere light yellow; lightened to apex.

Head: 0.56 mm long, 0.41 mm wide; eyes slightly prominent; EL: HL = 0.28; temples 1.6 times as long as eyes; nearly parallel; PW: EW = 1.07; posterior angles shortly rounded; posterior margin approximately straight; setiferous punctation on clypeus and interocular area denser than on vertex; on average, interstices as wide as diameter of punctures; except on irregularly impunctate midline; on vertex with wide impunctate midline; temples with denser punctation; isodiametric microsculpture dense and deep; surface slightly shiny.

Antennae as long as head and half of pronotum combined; first antennomere thicker than two following antennomeres; second and third antennomere elongate; second more than twice as long as wide; third antennomere 1.3 times as long as apical width; following antennomeres shorter and decreasing in length; fourth approximately quadrate; tenth wider than long; all antennomeres pubescent and with apical setae.

Pronotum 0.62 mm long, 0.57 mm wide; sides approximately parallel; in anterior third widely rounded; posterior angles shortly rounded; lateral margin fine; in dorsal aspect, visible in posterior half; setiferous punctation sparse; three pairs of punctures along wide impunctate midline; interstice between anterior pair of punctures more than twice as wide as between posterior two pairs; laterad with few additional punctures; along lateral margin with several setiferous punctures; without microsculpture; surface polished; partly with few micro-punctures.

Elytra 0.71 mm long, 0.75 mm wide; shoulders obtusely angulate; sides distinctly divergent to posterior angles; at posterior angles 1.3 times as wide as at shoulders; setiferous punctation in irregular lines of eight to nine punctures; on disc, beside sutural line of punctures, two additional lines; interstices between these lines shorter than between inner line and suture.

Abdomen densely pubescent.

Aedeagus elongate; seminal vesical of endophallus elongate; 0.6 times as long as central lobe; basal inner duct looped; ending in widened sclerotised structure; paramere not projecting central lobe; basal shaft straight and widened at middle to triangular process; apical shaft curved; clapsing central lobe; apex widely rounded and transparent; at upper edge with three long setae; few sensillae at basal shaft.

Spermatheca 0.24 mm long, 0.15 mm wide; bursa copulatrix in lateral or marginal position to coiled duct; coiled duct oval with only few coils.

Etymology: The species name derived from the country,

where it was found.

Figures

Figs 43: Fore-bodies of Diochus schuelkei (A), D. tricolor (B), D. vicinus (C), D. brooksi (D), D. ecuadoriensis E), D. maculicollis (F), D. mexicanus (G), D. peruvianus (H); scale bar: 0.5 mm.

Figs 18–21: Diochus inornatus-group: D. plaumanni (18), D. newtoni (19) and Diochus maculicollis-group: D. brooksi (20), D. ecuadoriensis (21); aedeagus (A), paramere (B) and antenna (C); scale bar: A, B: 0.1 mm, C: 0.2 mm.

Fig. 39: Spermathecae of Diochus inornatus-group: D. schuelkei (A), D. plaumanni (B), D. tricolor (C), D. vicinus (D); Diochus maculicollis-group: D. brooksi (E), D. ecuadoriensis (F), D. maculicollis (G), D. pumilio (H), D. peruvianus (I), D. mexicanus (J), D. panamaensis (K); Diochus schaumii-group: D. angustiformis (L); scale bar: 0.1 mm.