What is a genus-interpreting structural diversity among species of urothripine Phlaeothripinae (Thysanoptera) Author Mound, Laurence A. Author Lima, Élison Fabrício B. Author O’Donnell, Cheryle A. text Zootaxa 2023 2023-07-24 5319 1 91 102 http://dx.doi.org/10.11646/zootaxa.5319.1.6 journal article 57776 10.11646/zootaxa.5319.1.6 55424897-b73c-4e41-9aee-f5ad464d4275 1175-5326 8182213 F74A47A2-8711-45A5-856E-804C16B3C4C1 Distinguishing the Urothripine genera 1. Compound eyes each with at least 30 facets ( Figs 40–41 ), all equal in size; antennal segment III slender, usually 3–4 times as long as wide and not narrowed sharply to base; mid and hind tarsi 2-segmented; fore tarsal hamus directed ventrally; metathoracic epimera each with a prominent lateral seta....................................................... 2 -. Compound eyes never with more than 15 facets ( Figs 27–28 ), some dorsal facets much larger than others; antennal segment III almost globose, scarcely 2 times as long as wide and sharply narrowed to basal stem (sometimes fused to segment IV or to IV+V); mid and hind tarsi 1-segmented; fore tarsal hamus, when present, directed laterally; metathoracic epimera with or without such a seta.................................................................................... 3 2. Head projecting over bases of first antennal segment ( Fig 41 ); eyes almost holoptic but with no facets ventrally; head with genae narrowing to base; prosternal basantra present and transverse.................................... Octurothrips -. Head projecting strongly in front of eyes with antennae arising at apex ( Fig. 40 ); compound eyes globose on dorsal and ventral surfaces; head sharply narrowed to base; prosternal basantra reduced to weak sclerites placed anterolaterally.... Habrothrips 3. Prosternal basantra transverse across anterior margins of ferna......................................... Trachythrips -. Prosternal basantra absent or reduced to small anterolateral sclerites............................................. 4 4. Anterior margin of head with prominent setae, rarely reduced to a single small pair ( Figs 26–32 )...................... 5 -. Anterior margin of head with no prominent setae ( Figs 33–38 )................................................. 6 5. Antennal segment III narrowed at apex and distinct from narrowed base of IV ( Fig. 9 ); maxillary stylets close together medially in head..................................................................................... Bradythrips -. Antennal segment III broad at apex and close to broad base of IV, segments III–V weakly to closely fused; maxillary stylets about 0.3 of head width apart................................................................. Stephanothrips 6. Fore tarsus with hamus.......................................................................... Urothrips -. Fore tarsal hamus absent................................................................... Amphibolothrips