ChaetoclusiaOwen Lonsdale and Steve Marshall
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Dorsal setulae on vein R1 most readily characterizes Chaetoclusia Coquillett, a small neotropical genus of 13 species that is most diverse in Central America and the Caribbean (Lonsdale & Marshall 2006). Its type species, C. bakeri Coquillett, is widespread in the tropical Neotropics outside of the Caribbean, and is the only species likely to be encountered with any frequency; it is quite easily identified, being the only species in the genus with a densely plumose arista.
Chaetoclusia sabroskyi (Sóos) & Chaetoclusia bakeri Coquillett, 1904. © Owen Lonsdale
Chaetoclusia is most easily identified on the basis of setulae on vein R1 (Lonsdale & Marshall 2006) (one Pacific Czernyola has a few similar bristles at the apex of this vein). A ventrally reduced annulus and a minute anterior lateral scutellar bristle (larger in Chaetoclusia richardfreyi (Sóos)) are also useful for diagnosis, but these states occur independently in a number of Sobarocephala, occasionally in tandem. Black bristles are also synapomorphic of Chaetoclusia, but they are retained in only the most ancestral species. Non-synapomorphic diagnostic characters include a shiny gena (pilose or tomentose in most Sobarocephala), two postsutural dorsocentral bristles, no presutural intra-alar bristle, a dorsal preapical bristle on the mid tibia, and a closed cell bm (open in most other Sobarocephalinae).
Chaetoclusia has been revised by Lonsdale & Marshall (2006), providing a phylogenetic analysis and a key to all species. Chaetoclusia is the sister group to the clade containing Sobarocephala + Procerosoma, which is defined by an open cell bm, no presutural intra-alar bristle (also found in the Clusiodinae), and a small pregonite. These three genera make up the subfamily Sobarocephalinae, defined by migration of the sixth spiracle out of the annulus, a ventral lobe of the hypandrium that is usually at least as long as the hypandrial arm (secondarily reduced in several species of Chaetoclusia and Sobarocephala), and a relatively large surstylus.
Lonsdale & Marshall (2006) included the monotypic genera Chaetoclusiella Sóos, 1962 and Trichoclusia Sóos, 1962 as junior synonyms of Chaetoclusia.
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. Chaetoclusia. Version 20 August 2007 (under construction). http://tolweb.org/Chaetoclusia/27679/2007.08.20 in The Tree of Life Web Project, http://tolweb.org/