A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae)
Irmler, Ulrich
Beiträge Zur Entomologie = Contributions to Entomology
2017
2017-06-30
67
1
1
62
369YD
Irmler, 2017
Irmler
2017
[869,1099,1203,1230]
Insecta
Staphylinidae
Diochus
Animalia
Coleoptera
20
21
Arthropoda
species
ecuadoriensis
sp. nov.
Figs 21A–C, 39F, 43E
Type material: male, Holotype: Ecuador: Pichincha, Macquipucuna Station, 45 kmNW Quito, 1600–1650 melevation, 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 kmNW Quito, 1350 melevation, epiphyte berlesate, 1 male, 2 females, 20.12.1991, leg. C. Carlton& R. Leschen( KNHM, UIC); same location, same collector, 1650 melevation, 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 melev., 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 kmNE Baeza, 15 kmSW Reventador, litter, 4600 ft.elev., male, 28.– 30.10.1988, leg. L. Herman( AMNH); Napo Prov., 15.6 kmW of Baeza-El Chacojct., 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 kmSE Sto. Domingo de Colorados, Tinalandia, litter, 3000 ft.elev., 2 females, 16.– 21.10.1988, leg. L. Herman( AMNH).
Diagnosis: The species resembles D. brooksiand D. maculicollisby the bicoloured antennae. It can be easily distinguished from D. maculicollisby the dark blackish head and pronotum. D. ecuadoriensismostly resembles D. brooksiin the dark blackish colour. The head of D. ecuadoriensisis 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. ecuadoriensishave 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. brooksiand 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 mmlong, 0.41 mmwide; 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 mmlong, 0.57 mmwide; 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 mmlong, 0.75 mmwide; 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 mmlong, 0.15 mmwide; 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.
1990-04-14
KNHM
C. Carlton & R. Adarve
Ecuador
1625
Macquipucuna Station
20
21
1
Pichincha
holotype
1990-04-14
KNHM
C. Carlton & R. Adarve
Ecuador
1350
50 km NW Quito
20
21
1
Pichincha
paratype
1991-12-20
1991-12-21
1991-12-20
KNHM, UIC
C. Carlton & R. Leschen
Ecuador
1650
-0.6333333
Tiputini Res. Stat.
1308
-76.15
Reg.
20
21
1
Napo
paratype
1988-10-30
2000-09-25
1988-10-30
BMNH, AMNH
D. J. Inward & K. A. Jackson & L. Herman
Ecuador
Baeza
1768
Reventador
Rio Papallacta
20
21
1
Napo
paratype
1993-05-30
AMNH
L. Herman
Ecuador
Las Palmeras
1951
Alluriquin
Quito Sto. Domingo Rd.
20
21
1
Pichincha
paratype
1988-10-23
AMNH
L. Herman
Ecuador
914
21
22
Tinalandia
20
21
1
Pichincha
paratype
[192,592,265,289]
1988-10-21
AMNH
L. Herman
21
22
1