ProcerosomaOwen Lonsdale and Steve Marshall
- Procerosoma prominens Lonsdale & Marshall
- Procerosoma alini (Shatalkin)
Procerosoma Lonsdale & Marshall is a rare Neotropical genus known from one Mexican female (P. prominens Lonsdale & Marshall) and one male and one female from Brazil (P. alini (Shatalkin)) (Lonsdale & Marshall, 2006). The translation of the generic name is 'slender-bodied', referring to the relatively long and thin thorax and legs, which are characteristic of the genus.
The male of Procerosoma alini (and possibly all males in the genus) is distinct in that the head is wider than the thorax and there is one pair of elongate genal 'antlers' that terminate in a bright white bulb. Behavioural observations have not been made, but it is assumed that these structures are associated with head-measuring competitions and male agonistic behaviour, which has been recorded in a number of other clusiid genera.
Procerosoma is a relatively long, thin taxon defined by an inclinate anterior fronto-orbital bristle, an open cell bm, one pair of stripes on the face and scutum, a relatively small scutellum that is slightly angled dorsally, a reduction of the mid fronto-orbital bristle, and an absence of the ocellar, postvertical, acrostichal, and dorsal preapical tibial bristles (Lonsdale & Marshall, 2006). Internally, Procerosoma is characterized by a small pregonite, stout bristles on the postgonite and a basiphallus that is heavily setulose laterally.
Procerosoma alini (Shatalkin), male genitalia; left to right: external, posterior; external, left lateral (hypandrial complex inset); hypandrial complex, anterior; hypandrial complex, left lateral. © Owen Lonsdale
Procerosoma and Sobarocephala together form the sister group to the small neotropical genus Chaetoclusia. These three genera make up the subfamily Sobarocephalinae, which was described and revised by Lonsdale & Marshall (2006).
Lonsdale, O. & Marshall, S.A. 2006. Redefinition of the Clusiinae and Clusiodinae, description of the new subfamily Sobarocephalinae, revision of the genus Chaetoclusia and a description of Procerosoma gen. n. (Diptera: Clusiidae). European Journal of Entomology, 103: 163-182.
Canadian National Collection of Insects, Arachnids & Nematodes
University of Guelph, Canada
Correspondence regarding this page should be directed to Owen Lonsdale at and Steve Marshall at
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- First online 25 August 2005
- Content changed 20 August 2007
Citing this page:
Lonsdale, Owen and Steve Marshall. 2007. Procerosoma http://tolweb.org/Procerosoma/27694/2007.08.20 in The Tree of Life Web Project, http://tolweb.org/. Version 20 August 2007 (under construction).