Macroderes

Macroderes foveatus Frolov et Scholtz

Macroderes foveatus Frolov et Scholtz, habitus

Macroderes foveatus is similar to M. cornutus sp. n. in having the base of pronotum with very deep triangular concavity, but can be separated from it in having frontal suture without rounded tubercle, irregular, less elongated punctures on sides of pronotum, denser and larger punctures on elytral intervals, internal sac sclerite with small but distinct lateral process, and smaller average size.

Macroderes foveatus is known from a few localities in vicinity of Veldrif (Western Cape Province).

Macroderes fornicatus Sharp

Macroderes fornicatus Sharp, habitusMacroderes fornicatus is similar to M. mutilans and M. bias in having elytral intervals almost flat and matte, but can be separated from the former species by having punctate lateral border of pronotum and from the latter by having elytra more rounded apically and elytral stria 9 distinctly separated from stria 10. From both species it also differs in the shape of the internal sac sclerite.

Macroderes fornicatus is known from Cape Peninsula.

Macroderes endroedyi Frolov et Scholtz

Macroderes endroedyi Frolov et Scholtz, habitus

This species is very similar to M. namakwanus sp. n. but can be separated from it in having base of pronotum with sparser, somewhat irregular punctures, with more or less distinct tubercles in-between, elytral intervals more shagreened, with small shiny tubercles, and more curved basal part of internal sac sclerite. Body length 11.5 mm, width 8.0 mm.

Macroderes endroedyi is known from Western Cape Sandveld area.

Macroderes cornutus Frolov et Scholtz

Macroderes cornutus Frolov et Scholtz, habitus

This species is similar to M. foveatus sp. n. in having the base of pronotum with very deep triangular concavity, but can be separated from it in having a distinct rounded tubercle in the middle of frontal suture, elongated punctures on pronotum, sparser and smaller punctures on elytral intervals, internal sac sclerite without lateral process, and larger average size. Body length 10.8-11.5 mm

Macroderes cornutus is known from coastal area of the Namaqualand, South Africa.

Macroderes bias (Olivier)

Macroderes bias (Olivier), habitusMacroderes bias is similar to M. mutilans and M. fornicatus in having elytral intervals almost flat and matte, but can be separated from them by having more tapered, shield-shaped elytra in males, elytral stria 9 very close to stria 10, and long internal sac sclerite with feebly sclerotized apex. From the former species it can also be separated by having punctate lateral border of pronotum. Body length: 8.2–12.0 mm.

Macroderes bias is known from South Africa, mostly from Eastern Cape Province ranging up to Uniondale in the west.

Macroderes arrowi Janssens

Macroderes arrowi Janssens, habitusMacroderes arrowi is similar to M. greeni, M. foveatus, and M. cornutus, in having elytral intervals with punctures with slightly carinate margins, but can be separated from them in having pronotum granular as opposed to being punctate with round punctures in M. greeni and punctate with very elongated punctures in M. foveatus sp.n. From the two later species it also differs in having the pronotum without a concavity on the base. Body length: 9.0-11.5 mm.

Macroderes arrowi is known only from vicinity of Vanrhynsdorp, Western Cape Province, South Africa.

Revision of the southern African genus Macroderes Westwood

Frolov, A. V. & Scholtz, C. H. 2005. Revision of the southern African genus Macroderes Westwood (Coleoptera: Scarabaeidae: Scarabaeinae). Annales de la Société Entomologique de France (N. S.), 40(3-4): 371-391. PDF (1.44 MB)

Abstract – The southern African genus Macroderes Westwood is revised. Six new species, M. amplior n. sp., M. minutus n. sp., M. endroedyi n. sp., M. namakwanus n. sp., M. foveatus n. sp., and M. cornutus n. sp., are described.The neotype of M. bias (Olivier) is designated.Two new synonymies are established: M. pilula Sharp is a junior synonym of M. bias (Olivier), and M. westwoodi Preudhomme de Borre is a junior synonym of M. undulatus Preudhomme de Borre. A key to species and notes on biology and distribution are given.

Genus Macroderes Westwood, 1842

Macroderes bias

Macroderes Westwood, 1842 is a small genus (15 species) of the scarabaeine dung beetles endemic to southern Africa. Species of Macroderes are of medium size and can be recognized by their convex, bulky body and absence of wings. Colour monotonous black; recently emerged specimens reddish-brown. Males have tibiae with acute process next to apical spur, similar to that of representatives of genera Xinidium Harold and Metacatharsius Paulian.

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