Euops (Riedeliops) keiseri Voss

Riedel, Alexander, 2009, A taxonomic study of the Indian species of Euops Schoenherr (Coleoptera: Curculionoidea: Attelabidae), Zootaxa 2125, pp. 1-56 : 26-27

Euops (Riedeliops) keiseri Voss

( Figs. 9, 10 , 21–22 , 57–59, 98, 112–113, 120, 127, 134, 148–152, 166, 173, 182, 187)

Euops keiseri ( Voss), 1957: 98 –99 (type locality: Mavanella [probably vicinity of 07° 14´N 80° 12´E; ca. 100m], Sri Lanka).

Riedeliops keiseri (Voss) : Legalov, 2003: 385.

Asynaptops keiseri Voss : Legalov, 2007: 225.

Diagnosis. Anterior margin of prothorax in front of procoxa angulately projecting; mesosternum with apically rounded, cone-shaped protrusion directed anteriad ( Fig. 77 ); protibia in female ( Fig. 134 ) with dorsal contour evenly convex; mesotibia in male ( Fig. 127 ) with subapical dorsal extension moderately long, spiniform; ventrite 4 in male with median pit containing dense brush of erect setae, their tips pointing forward ( Fig. 98 ); apex of pedon pointed ( Fig. 151 ).

Material examined. Holotype, female (Figs. 57–59): labels: 1) [white, rectangular]: “ CEYLON Sab., Mavanella [probably vicinity of 07° 14´N 80° 12´E; ca. 100m], 18.XI.1953, F. Keiser [printed]”, 2) [white, rectangular] “ Euops keiseri n.sp. [handwritten], det. E. Voß [printed]” 3) [red, rectangular] “ TYPUS [printed]”; condition: fair, right foreleg broken and missing, right metatarsus broken and glued to card, originally card-mounted but point-mounted for examination ( NHMB). Other specimens. 1 male, SRI LANKA, Balangoda [information from Google Earth: 06° 39´N 80° 42´E], 1776 ft [= 541m], 13–16.III.82, leg.G. Lewis ( BMNH).

Distribution ( Fig. 187 ).

Notes. Euops keiseri was described by Voss from a single female from Sri Lanka. Generally it is difficult to correctly interpret Euops species on the limited character set of the female, but in this case a male from Sri Lanka was found that closely matched the characters of the type. The species is very similar to E. indicus and E. pseudoindicus and evidently closely related. It occurs both in Sri Lanka and in India. The Indian specimens are larger (length 2.24–2.34 mm (n=3, x =2.29 ± 0.05), compared with 1.99–2.10 mm (n=2, x =2.05) in Sri Lanka) and differ in having a more prominent mesosternal protuberance, the sculpture of the pronotum more densely punctate between the wrinkles and the elytral interstriae more distinctly transversely rugose. They agree well with the Sri-Lankan specimens in all other characters. The genitalia of males of the indicus -group offer only characters diagnostic of the group but fail to show characters useful for a distinction of the species; thus they do not provide additional information on the status of this population. In view of the geographical separation and the slight morphological differences of the Indian population, it is here described as a subspecies of E. keiseri .

Figures

FIGURE 187. Distribution of Euops keiseri (areas above 500 m shaded).

FIGURES 7 – 12. Habitus of Euops spp., dorsal aspect: (7) E. indicus, male (11 km SE Kotagiri); (8) E. indicus, female (11 km SE Kotagiri); (9) E. keiseri nilgiriensis ssp. n., holotype; (10) E. keiseri nilgiriensis ssp. n., female paratype; (11) E. pseudoindicus sp. n., holotype; (12) E. pseudoindicus sp. n., female paratype.

FIGURES 19 – 24. Habitus of Euops spp., lateral aspect: (19) E. indicus, male (11 km SE Kotagiri); (20) E. indicus, female (11 km SE Kotagiri); (21) E. keiseri nilgiriensis ssp. n., holotype; (22) E. keiseri nilgiriensis ssp. n., female paratype; (23) E. pseudoindicus sp. n., holotype; (24) E. pseudoindicus sp. n., female paratype, arrow pointing to projection of prepectus.

FIGURES 71 – 78. Euops spp.: (71 – 74) apex of rostrum in ventral aspect (left), prementum (right): (71 – 72) E. indicus, (73 – 74) E. andrewesi; (75 – 76) prothorax in ventral aspect, coxae removed: (75) E. indicus, (76) E. pseudoindicus sp. n., arrows indicating projections of prepectus; (77) mesothorax of E. indicus, lateral aspect; arrow indicating protrusion; (78) pronotum of E. andrewesi.

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 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 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.