Cotasterosoma Konishi, 1962

Grebennikov, Vasily V. & Morimoto, Katsura, 2016, Flightless litter-dwelling Cotasterosoma (Coleoptera: Curculionidae: Cossoninae) found outside of Japan, with mtDNA phylogeography of a new species from Southwest China, Zootaxa 4179 (1), pp. 133-138 : 134-135

Cotasterosoma Konishi, 1962

Konishi 1962: 3 (species included: omogoensis ). Type species: Cotasterosoma omogoensis Konishi, 1962 , by original designation.

Diagnosis. Species of the genus Cotasterosoma are recognizable among all weevils by the unique combination of the following nine non-unique adult characters: (1.) small-sized relatively glabrous weevils of characteristic “edaphic Cossoninae ” habitus ( Figs 1 A–D, 2A–D); (2.) antennae consisting of scape, funicle with six ( Fig. 2 F) or seven antennomeres (the type species, but see Discussion) and seemingly one-segmented club ( Fig. 2 F); (3.) all tarsi fivesegmented ( Figs 2 G–I); (4.) all tarsomeres subcylindrical in shape ( Figs 2 G–I); (5.) fore-legs with unci arising from the middle of apical margin of tibia ( Fig. 2 G), and not from the dorso-apical corner; (6.) tarsomere 3 not enlarged ( Figs 2 G– I); (7.) tarsomere 4 short and inserting at apical surface of tarsomere 3, with a few setae on ventral side ( Figs 2 G–I); (8.)

male genitalia with U- or Y-shaped tegmen broadly abbreviated dorsally ( Figs 1 E–H); (9.) collum of spermatheca bent at apex and almost parallel to ramus ( Fig. 2 K).

Figures

FIGURE 1. Cotasterosoma coronus sp. n., holotype, male. A – D: habitus; E: genitalia and abdominal tergites 7 and 8, ventral; F – H: genitalia (F: dorsal, G: ventral, H: lateral).

FIGURE 2. Cotasterosoma coronus sp. n., paratype, female, specimen # 1110 from Mt. Emei. A – D: habitus; E – F: head and prothorax (E: ventral, F: lateral); G – I: distal part of right legs (G: fore-, H: mid-, I: hind-); J: genitalia, ventral; K: spermatheca.