Taxonomic revision of the Temnothorax salvini clade (Hymenoptera: Formicidae), with a key to the clades of New World Temnothorax Author Prebus, Matthew M. School of Life Sciences, Arizona State University, Tempe, Arizona, United States & Department of Entomology & Nematology, University of California, Davis, Davis, California, United States mprebus@gmail.com text PeerJ 2021 e 11514 2021-06-30 9 1 462 http://dx.doi.org/10.7717/peerj.11514 journal article 10.7717/peerj.11514 e56413f9-7dc9-4ebc-9085-008cb38b4dc1 2167-8359 PMC8254503 34249486 5102026 acuminatus group overview This group is composed of two previously undescribed species, Temnothorax acuminatus sp. nov. and T. tuxtlanus sp. nov. , which are found in Southern Mexico , from the mountain complexes of Los Tuxtlas and the Sierra Madre de Chiapas at mid-to-high elevations ( Fig. 90 ). These species are united by the lack of setae on the dorsum of the propodeum, reduced subpetiolar tooth, moderately impressed metanotal groove, posterodorsally directed propodeal spines, and dark coloration. Members of this group have been collected from bark crevices, from under epiphyte mats on treefalls, and from sifted leaf litter. Species of the acuminatus group may be confused with T. acutispinosus sp. nov. , which has an overlapping distribution, similar habitus, and lack of setae on the propodeum. Temnothorax acutispinosus sp. nov. can be distinguished from the acuminatus group by the larger subpetiolar tooth and dorsally directed propodeal spines. The two species of the acuminatus group are sister to the remainder of the salvini clade (Prebus, in prep.).