Randersonia cartwrighti Chamorro & Presnall, 2022

Chamorro, M. Lourdes & Presnall, Tara Milovana, 2022, Randersonia Chamorro, a new genus with two new species of North American Cryptorhynchinae (Coleoptera: Curculionidae), Zootaxa 5222 (6), pp. 591-599 : 593

Randersonia cartwrighti Chamorro & Presnall sp. n.

( Fig. 1 )

http://zoobank.org/ urn:lsid:zoobank.org:act:997472C9-44E3-4404-8529-FF6032D1EB40

Type Locality. USA, Virginia, Prince William County Forest Park .

Material examined. Holotype, ♁: Deer droppings / VA: Prince Wm. / Forest Park / 5 Aug 1965 / C & C // USNMENT01448850 // HOLOTYPE / Randersonia cartwrighti / des. Chamorro & Presnall 2022 ( USNM) (not dissected) .

Differential diagnosis. Randersonia cartwrighti can be distinguished from R. schwarzi by the absence of a visible scutellum, the medially narrower elytra, less developed humeri, glabrous apex of the rostrum beyond the antennal insertion (possibly a sexually dimorphic character), longer desmomeres, each approximately two times longer than wide, pronotum two times longer than wide instead of 1.25 times longer as in R. schwarzi , basal squamose scales present and relatively smaller ommatidia, and ventrites 1+2 two times longer than wide versus two times wider than long in R. schwarzi .

The species is similar to P. floridianus and R. schwarzi in having flattened interstriae, different from P. subtropicus which has the interstriae elevated. It also resembles these two other species in small size, being almost half as long as P. subtropicus and in having a more horizontal profile.

Description. Holotype male, body elongate narrow, 1.5 mm in length (exclusive of head and rostrum), 0.5 mm in width (measured at widest point), depth 0.4 mm, color light reddish brown. Head not impressed, with scattered scales mostly concentrated around eyes. Rostrum straight, moderately long, impunctate, about as long as pronotum, dorso-ventrally flattened, scales present basally, absent from apical half, antennae inserted at about midlength rostrum. Antennae light-brown, funicle with seven desmomeres, first desmomere slightly longer than second, second desmomere almost two times longer than third. Eyes oval, flat. Pronotum two times longer than wide, anterior margin, medially feeble emarginate, widest point medially, in lateral view sinuate one third from anterior margin; large, deep punctation evenly throughout, punctures with diameter greater than intervening distance; light brown, erect, clavate scales, predominantly anteriorly and laterally; plumose scales scattered throughout with two basal lateral clumps and along basal margin. Elytra elongate-cylindrical, humeri not developed, scutellum not visible. Venter not clothed with scales or crust, sparsely setose, feebly punctate, ventrites 1 and 2 two times longer than wide. Male (apex of median lobe visible) not dissected.

Etymology. The species is named in honor of Oscar L. Cartwright (1900–1983) former curator of Coleoptera at the USNM and an authority on Western Hemisphere aphodiine scarabs. He and presumably his wife, collected the only known specimen of this new species.

Distribution. USA: Virginia.

Figures

FIGURE 1. Habitus of Randersonia cartwrighti Chamorro & Presnall, sp. n., male. A—lateral view; B—dorsal view; C— ventral view.