Setizembrus Germann, 2025

Germann, Christoph, 2025, Setizembrus Germann, a new genus of the subtribe Cotasteromimina with five new species from Malaysia (Coleoptera, Curculionidae: Molytinae, Pissodini), Zootaxa 5659 (2), pp. 283-295 : 284

Setizembrus Germann gen. nov.

https://zoobank.org/ urn:lsid:zoobank.org:act:31E3E4B3-FA73-41CD-BA29-6389C2193843

Type species Setizembrus geiseri Germann sp. nov.

Body size 2.85–4.80 mm. Head globular, deeply retracted in pronotum. Eyes oval, in lateral view below level of rostral base in dorsal view eye contours not protruding outside head contour. Ocular lobes weakly pronounced, set with teeth ( S. semai , S. bispinosus ) or unarmed. Rostrum bowed, shorter than pronotum or subequal in length ( S. pendleburyi ), scrobes lateral, oblique. Antenna funicle with 7 antennomeres, with second antennomere partly hidden in first. Following ones gradually enlarging, thus seventh antennomere about as wide as first. Club egg-shaped to oval. Body including head, rostrum, legs and antennal scape with elongate-clubbed scales, 4–5 times or longer than wide. Thoracic venter anterior of procoxae with remarkable protuberance ( S. semai , S. bispinosus ) or without. Anterior margin of prothoracic venter simply rounded, lacking any emargination or prosternal rostral canal. Elytra elongate, cylindrical with elytral declivity steep, and pronounced humeri, hind wings present ( S. semai , S. bispinosus and S. geiseri ) or without ( S. lyali , S. pendleburyi ). Scutellum small and pentagonal. Elytral base wider than posterior margin of pronotum. Elytra with ten punctate striae, stria 10 shortened, a little shorter than epipleura. Inner surfaces of elytra at apex without stridulatory ridges. Profemora dentate with sharp teeth or a blunt swelling ( S. semai , S. bispinosus and S. lyali ) or unarmed ( S. geiseri , S. pendleburyi ). Tibiae uncinate at outer edge, with several stiff spines at inner edge; premucro absent. Procoxae subcontiguous or separated by half of their diameter. Third tarsomere more ( Fig. 2G ) or less ( S. pendleburyi ; Fig. 5G ) bilobed. First and second ventrite with fused suture between, obliterated in middle, visible at sides, ventrites 3 and 4 very narrow. Penis body with ventral and lateral sides well sclerotized, dorsal surface membranous, with internal sclerites. Tegmen ring with strong apodeme and feebly sclerotized parameroid lobes (except S. pendleburyi ).

Derivation of name: The generic name is a combination of Latin for the apparent long scales or setae (seti -) and the morphologically close genus Zembrus ; gender is male.

Diagnosis

Setizembrus displays characters originally indicated by Morimoto (1962a, b) and later adapted by Germann & Grebennikov (2020) and Germann (2021) as diagnostic for Cotasteromimina , namely, i) abdominal process between metacoxae much broader than coxal width; ii) robust rostrum, relatively short (not longer than 1.1x pronotal length; iii) eyes in lateral view close to front margin of pronotum, width of temple less than diameter of eye; iv) antennal funicle with stout first antennomere. The distinctive basisternal protuberance is so far only known in males.

Setizembrus is morphologically closest to the genera Seticotasteromimus , Pseudohylobius , Obhylius (shared raised scales with all three, and with the 2 nd antennomere of funicle partly hidden in first in the latter two), and Zembrus (body outline, rostrum).

Figures

FIGS 2A–C. Setizembrus bispinosus. Holotype habitus dorsal, ventral and lateral views. 2D. Frontolateral view. 2E. Lateral view on teeth posterior to ocular lobe. 2F. Double spines on basisternum anterior to procoxae. 2G. Bilobed third tarsomere. 2H. Ventrites (4th destroyed). 2I. Scutellum. 2J. Antenna (Photos: C. Germann).

FIGS 5A–C. Setizembrus pendleburyi. Male holotype, habitus dorsal, ventral and lateral views. D. Frontolateral view. E. Female habitus, dorsal view. F. Scutellum. G. ventrites. H. Third tarsomere. I. Antenna (Photos: C. Germann).