Euops (Riedeliops) keiseri nilgiriensis, Riedel, Alexander, 2009

Riedel, Alexander, 2009, A taxonomic study of the Indian species of Euops Schoenherr (Coleoptera: Curculionoidea: Attelabidae), Zootaxa 2125, pp. 1-56 : 27-28

Euops (Riedeliops) keiseri nilgiriensis ssp. n.

Description. Holotype, male. Body length: 2.10 mm. Coloration black with marked bluish-bronze lustre, most distinct on pronotum; elytra dark blue.

Head ( Fig. 112 ) short. Gena 0.75 x as long as width of head behind eyes. Vertex microreticulate, punctate, weakly rugose. Eyes dorsally contiguous in middle for 0.7 x their length. Ventral surface markedly transversely rugose, anteriorly with interspersed punctures.

Rostrum 1.44 x longer than mouthparts; sides subparallel to antennal insertion, diverging anteriad, subapically rounded; at widest point 1.24 x wider than at base; dorsum above antennal insertions with weakly rounded prominence, anteriorly sinuate to apex. Clypeus medially with simple notch. Basal lateral groove distinct, ventrally curved, its convex side anteriorly; terminating on level of ventral margin of eye. Venter basally without submental median carina. Submentum shining, posteriorly densely punctate, anteriorly with two long, stiff, suberect setae. Prementum at base 1.8 x wider than long, ca. 3.5 x wider than at apex; sides straight, converging apicad.

Antenna ( Fig. 120 )with funicular articles relatively broad.

Proventriculus with eight uniform primary folds bearing spiniform processes.

Thorax. Prothorax 0.87 x as long as wide; subbasal constriction laterally absent, dorsally shallow; sides converging in straight line, weakly rounded in apical third; without preapical constriction; anterior margin laterally in front of procoxa with collar-like extension abruptly truncated ventrally, angular in profile; disc markedly punctate-rugose, in basal half with transverse wrinkles concave, in apical half rather V-shaped; sides punctate; prepectus in lateral aspect as long as postpectus; mesosternum with apically rounded, cone-shaped protrusion directed anteriad. Height of pterothorax 0.91 x length of elytron.

Elytron 2.00 x longer than wide; intervals weakly shining, somewhat dull, with distinct coriarious sculpture of irregularly transverse wrinkles.

Legs. Procoxa 0.88 x as long as wide; approaching anterior margin of prothorax; in anterior aspect coxae with inner contour diverging in convex line; anterior surface microreticulate, sparsely shallowly punctate. Protibia with dorsal contour evenly convex; uncus subventral. Mesotibia ( Fig. 127 ) with subapical dorsal extension stout, spiniform.

Abdomen. Venter laterally weakly concave; surface medially sparsely punctate, glabrous except ventrite 4 with median pit containing dense brush of erect setae, their tips pointing forward ( Fig. 98 ). Pygidium 0.80 x wider than long.

Terminalia. Sternite VIII ( Fig. 166 ) medially subdivided by membrane connecting lateral sclerotised areas; apex broadly bilobate, densely setose with long setae; base medially with marked constriction. Tegminal plate as in Fig. 152 . Aedeagus with sclerotised sides of pedon widening mesoapicad, connected to subtriangular plate fused with its short side to apical scoop, the latter ( Fig. 151 ) ca. 1.15 x longer than wide, sides sinuate and converging, apex pointed; tectum with sides converging, apically pointed; TA ( Figs. 149–150 ) flagelliform, insertion of ductus ejaculatorius ventral; basal sclerite long, narrow, folded dorsoapicad, dorsally fitting to basal half of long, S-shaped flagellum formed by fusion of extended transfer processes. Endophallus with cuticle densely minutely denticulate.

Female. As holotype except: Length 2.28 mm. Head as in Fig. 113 . Gena 0.69 x as long as width of head behind eyes. Rostrum 1.67 x longer than mouthparts. Prothorax 0.76 x as long as wide. Elytron 2.11 x longer than wide. Height of pterothorax 0.87 x length of elytron. Procoxa as long as wide (1.03 x). Protibia ( Fig. 134 ) with dorsal contour evenly convex; ventral contour evenly sinuate; uncus median. Abdomen with venter flat. Pygidium 1.10 x wider than long. Sternite VIII as in Fig. 173 . Spermatheca ( Fig. 182 ) with body moderately tapering apicad.

Material examined. Holotype, male: INDIA, Tamil Nadu, 15 km SE Kotagiri, Kunchappanai, 11°22´N, 76° 56´E, 900m, leg. D. Hauck ( SMNK). Paratypes: INDIA, Tamil Nadu: 1 female, same data as holotype ( ARC in SMNK); 1 female, Tamil Nadu, 15 km SE Kotagiri, Kunchappanai, 11°22´N, 76° 56´E, leg. L. Dembický & P. Pacholátko, 17.–22.V.1997 ( NHMB).

Figures

FIGURES 110 – 115. Head of Euops spp.; in lateral aspect (above); in dorsal aspect (below): (110) E. indicus, male (11 km SE Kotagiri); (111) E. indicus, female (11 km SE Kotagiri); (112) E. keiseri nilgiriensis ssp. n., holotype; (113) E. keiseri nilgiriensis ssp. n., female paratype; (114) E. pseudoindicus sp. n., holotype; (115) E. pseudoindicus sp. n., female paratype.

FIGURES 116 – 122. Antenna of Euops spp.: (116) E. andrewesi (11 km SE Kotagiri); (117) E. tamilnadunsis (Ootacamund); (118) E. bowringii (11 km SE Kotagiri); (119) E. indicus (11 km SE Kotagiri); (120) E. keiseri nilgiriensis ssp. n., holotype; (121) E. pseudoindicus sp. n., holotype; (122) E. trichinopoliensis, holotype.

FIGURES 123 – 129. Left mesotibia of Euops spp. males: (123) E. andrewesi (11 km SE Kotagiri); (124) E. tamilnadunsis (Ootacamund); (125) E. bowringii (lectotype); (126) E. indicus (11 km SE Kotagiri); (127) E. keiseri nilgiriensis ssp. n., holotype; (128) E. pseudoindicus sp. n., holotype; (129) E. trichinopoliensis, holotype.

FIGURES 93 – 99. Euops spp.: (93 – 96) apex of abdominal venter, overview (left), setose patch on ventrite 4 (right); (93 – 94) E. indicus, (95 – 96) E. pseudoindicus sp. n.; (97) E. indicus, lateral view of abdomen; arrow indicating setose patch on ventrite 4; note densely punctate sculpture; (98) E. keiseri nilgiriensis ssp. n., holotype; ventro-lateral aspect of abdomen with setose brush on ventrite 4, light-microscopy image; (99) E. andrewesi, transfer apparatus of male genitalia.

FIGURES 161 – 167. Sternite VIII of Euops spp. males: (161) E. andrewesi, lectotype; (162) E. tamilnadunsis, holotype; (163) E. bowringii; holotype of E. armipes; (164) E. pseudoindicus sp. n., holotype; (165) E. indicus (11 km SE Kotagiri); (166) E. keiseri nilgiriensis ssp. n., holotype; (167) E. trichinopoliensis, holotype, setae probably partly abraded.

FIGURES 148 – 152. Male genitalia of Euops keiseri nilgiriensis ssp. n., holotype: (148) aedeagus in dorsal aspect; (149) aedeagus in lateral aspect; (150) transfer apparatus in lateral aspect; (151) pedon; (152) tegmen.

FIGURES 130 – 135. Left protibia of Euops spp. females: (130) E. andrewesi (11 km SE Kotagiri); (131) E. tamilnadunsis (Ootacamund); (132) E. bowringii (lectotype); (133) E. indicus (11 km SE Kotagiri); (134) E. keiseri nilgiriensis ssp. n., female paratype; (135) E. pseudoindicus sp. n., female paratype.

FIGURES 168 – 173. Sternite VIII of Euops spp. females: (168) E. andrewesi (11 km SE Kotagiri); (169) E. tamilnadunsis (Ootacamund); (170) E. bowringii (11 km SE Kotagiri); (171) E. indicus (11 km SE Kotagiri); (172) E. pseudoindicus sp. n., female paratype; (173) E. keiseri nilgiriensis ssp. n., female paratype.

FIGURES 174 – 182. Female terminalia of Euops spp.: (174) E. bowringii (11 km SE Kotagiri); (175) E. tamilnadunsis (Ootacamund); (176) E. indicus (11 km SE Kotagiri); (177 – 182) spermatheca: (177) E. andrewesi (11 km SE Kotagiri), (178) E. bowringii (11 km SE Kotagiri); (179) E. tamilnadunsis (Ootacamund); (180) E. indicus (11 km SE Kotagiri); (181) E. pseudoindicus sp. n., female paratype; (182) E. keiseri nilgiriensis ssp. n., female paratype.