Ischyropalpus angustatus (Pic, 1942) Telnov, 2024

Telnov, Dmitry, 2024, On the taxonomy of some South American and Australo-Pacific Anthicidae Latreille, 1819 (Coleoptera) with new subfamily and tribe-rank synonymies, Zootaxa 5501 (3), pp. 401-424 : 403

Ischyropalpus angustatus (Pic, 1942) comb. nov.

Pic (1942: 12) as Micreurygenius angustatus .

Type material examined. Syntype, sex unknown, MNHN: Micreurygenius n. g. [handwritten] // M. angustatus n.sp [handwritten] // [two unread handwritten labels].

The studied syntype of Micreurygenius angustatus clearly appears to be a member of Anthicini ( Anthicinae ) and not Eurygeniinae (see Chandler (2002) for the most recent key to the subfamilies of American anthicids) due to the combination of the following features: the anterior margin of pronotum lacking the dorsally protruding flange or collar over / encircling cranial ‘neck’, the cranial ‘neck’ width about a fourth head width across compound eyes, the compound eye rounded at anterior margin (not notched or emarginate as in most Eurygeniinae ). The syntype, although mounted on a card and consequently not studied in detail in ventral view, displays the following features characteristic to Ischyropalpus (as in Chandler (2002)): the head fully exposed, the cranial ‘neck’ exposed in lateral but hidden beneath occiput in dorsal view, the terminal maxillary palpomere securiform, the pronotum rounded at anterior margin. A new synonym and a new combination are therefore proposed.

Unfortunately, a comprehensive note on this species was not kept when I studied the syntype, making a proper redescription impossible. The syntype is about 3 mm long, dorsal and ventral forebody dark brown, elytra paler brown. Antenna pale brown, legs yellowish. Dorsal forebody opaque, with dense moderately deep subannular punctures. Intervening spaces on dorsal forebody narrower than punctures. Head base broadly rounded posterior to compound eyes, tempus considerably shorter than eye length. Compound eye large, moderately prominent in lateral aspect. Antenna long, terminal antennomere slender, acutely pointed, about 1.7× as long as penultimate antennomere.Antennomeres 7‒10 of nearly same length, moderately widened distally.Terminal maxillary palpomere narrowly securiform, moderately large. Pronotum about 1.1‒1.2× as wide as head across compound eyes, elongate sybcylindrical, dorsally flattened, broadly rounded at anterior, truncate at posterior margin, antebasal sulcus distinct, present dorsally and laterally. Elytra subparallel, flattened dorsally, punctures less coarse compared to those on dorsal forebody, less deep and ordinary (not subannular). Dorsal vestiture of body yellowish, moderately long, rather sparse, nearly appressed.

This species is likely a member of the eryngii informal species-group as defined by Werner (1966), however, the terminal maxillary palpomere is less strongly securiform. Therefore, the present placement of I. angustatus to the eryngii species-group is tentative.