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 Diagnosis of the salvini clade based on the worker caste The workers of the salvini clade lack a singular diagnostic feature, but can be diagnosed with the following combination of characters: 1. Antennae composed of 12 antennomeres. 2. Postpetiole moderately to very broad: 1.4 to 3 times as broad as the caudal cylinder in dorsal view (PWI 140-300); if less than 1.5 times, then antennal scapes are moderately short, failing to reach the posterior margin of the head by the maximum width of the antennal scape or less, and dorsum of propodeum lacks standing setae. Figure 26 Petioles of Temnothorax workers in profile, comparing non-cuneiform and cuneiform. (A) T. rudis (CASENT0005689; photo: April Nobile, from www.antweb.org). (B) T. andrei (CASENT0005683; photo: April Nobile, from www.antweb.org). (C) T. myrmiciformis (CASENT0339323; photo Marek Borowiec, from www.antweb.org). (D) T. paiute (CASENT0005932; photo Marek Borowiec, from www.antweb.org). (E) T. gallae (CASENT0005684; photo: April Nobile, from www.antweb.org). (F) T. nitens (CASENT0005686; photo: April Nobile, from www.antweb.org). (G) T. furunculus (CASENT0105615; photo: Dan Kjar, from www.antweb.org). (H) T. arboreus (CASENT0005933; photo: April Nobile, from www.antweb.org). Scale bars 0.2 mm. Full-size DOI: 10.7717/peerj.11514/fig-26 3. Anterodorsal region of petiole with or without tubercles that are united by a transverse carina; if tubercles present, then median lobe of clypeus bearing many (> 3) fine carinae, femora incrassate (FI> 250), or, if femora not incrassate, then dorsum of propodeum lacks standing setae. 4. Propodeum bearing teeth or spines; or, if propodeum is unarmed, then propodeum is strongly depressed below the level of the evenly convex promesonotum. 5. Legs usually without long tapering setae, but if present, then medial lobe of clypeus bearing many (> 3) longitudinal carinae, or propodeum is strongly depressed below the level of the evenly convex promesonotum.