Abstract
A new species, Stethantyx durrelli sp. n. from Brazil, is described and illustrated. The recently described genus Megalochus Khalaim & Broad is synonymized with Stethantyx. The new species is very similar to S. grandis (Khalaim & Broad), comb. n. but differs by the first metasomal segment being trapeziform in cross-section, the presence of a distinct glymma, and the metapleuron and dorsolateral area of the propodeum being densely punctate, without coarse irregular rugae. These two species are the largest and most conspicuous representatives of the subfamily Tersilochinae. A partial key to species of Stethantyx is provided. Taxonomy and generic limits of Stethantyx are discussed.
Highlights
Keywords Neotropical region, South America, Megalochus, taxonomy, new species, new synonymy, key Stethantyx Townes is a large New World genus comprising 48 described and many undescribed species, most of which are Neotropical (Khalaim and Broad 2013; Khalaim et al 2013, 2015; Khalaim and Ruíz-Cancino 2013; Khalaim 2016), as well as S. nearctica Townes which ranges from the northern US to Mexico and S. crassa
The genus Megalochus was described for a single species, M. grandis, occurring from Costa Rica to southern Brazil
This genus was considered to be related to the large Neotropical genus Stethantyx, forming with the latter and the monotypic Australian genus Australochus Khalaim (Khalaim 2015) a distinctive group of genera, the Stethantyx genus-group, and originally was distinguished from Stethantyx on the basis of the following features (Khalaim and Broad 2013): Contribution to the study of the genus Stethantyx Townes
Summary
Stethantyx Townes is a large New World genus comprising 48 described and many undescribed species, most of which are Neotropical (Khalaim and Broad 2013; Khalaim et al 2013, 2015; Khalaim and Ruíz-Cancino 2013; Khalaim 2016), as well as S. nearctica Townes which ranges from the northern US to Mexico and S. crassaCopyright Andrey I. Stethantyx Townes is a large New World genus comprising 48 described and many undescribed species, most of which are Neotropical (Khalaim and Broad 2013; Khalaim et al 2013, 2015; Khalaim and Ruíz-Cancino 2013; Khalaim 2016), as well as S. nearctica Townes which ranges from the northern US to Mexico and S. crassa. Stethantyx is closely related to the small Neotropical genus Megalochus Khalaim & Broad, with only one widely distributed species, M. grandis Khalaim & Broad. The genera were thought to be related based on the following synapomorphies: 1) fore wing with obtusely angled first and second abscissae of radius; 2) slender and usually long intercubitus and abscissa of cubitus between intercubitus and second recurrent vein; 3) the narrow pterostigma; and 4) dorsal end of epicnemial (prepectal) carina not joining the anterior margin of mesopleuron, continuing dorsoposterior to the subtegular ridge, or evanescent dorsally (Khalaim and Broad 2013). The Stethantyx genus-group was established for these two genera, comprising the largest and most conspicuous representatives of the subfamily, and recently the endemic Australian genus Australochus Khalaim was included in this genus-group (Khalaim 2015)
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