Key to the species of Ptilomerinae (Hemiptera: Heteroptera: Gerridae) of Thailand and review of the fauna of the Tennaserim Mountain Range Author Raruanysong, Sajeemat Author Vitheepradit, Akekawat Author Sites, Robert W. text Zootaxa 2014 3852 1 101 117 journal article 10.11646/zootaxa.3852.1.4 527bebc8-3c9d-4353-b991-c92a913ee7dd 1175-5326 230500 D0876B07-5E29-4D4F-BFB4-968CFBA5BCE1 Key to the species of Ptilomera of Thailand 1. Male ( Figs. 10–23 ).................................................................................... 2 1’. Female ( Figs. 24–37 )...................................................................................8 2. Fringe of intertwined swimming hairs restricted to a small tuft near the apex of the middle femur................. P. fang 2’. Fringe of intertwined swimming hairs extending more than half the length of the middle femur........................ 3 3. Proctiger with lateral wings very small, present as short as projections basally; central lobe of proctiger beyond lateral wings more than twice length of the lateral wings ( Fig. 12 ).............................................. P. hemmingseni 3’. Proctiger with lateral wings large and well developed; central lobe of proctiger beyond lateral wings less than twice length of the lateral wings ( Figs. 14, 16, 18, 20, 22 ).................................................................. 4 4. Pygophore with a narrow, digitate apex ( Fig. 21 )................................................... P. tennaserim 4’. Pygophore with a roundly triangular apex ( Figs. 15, 17, 19, 23 ).................................................5 5. Proctiger with the median lobe more or less even with posterior tips of the lateral wings ( Figs. 14, 22 ).................. 6 5’. Proctiger with the median lobe well surpassing the posterior tips of the lateral wings ( Figs. 16, 18 )..................... 7 6. Pygophore with well-developed median carina on ventral surface ( Fig. 15 )................................ P. hylactor 6’. Pygophore lacking median carina on ventral surface ( Fig. 23 )............................................ P. tigrina 7. Pygophore with lateral projections weakly-developed ( Figs. 18, 19 ).......................................... P. kra 7’. Pygophore with lateral projections well-developed, surpassing the lateral wings of the proctiger ( Figs. 16, 17 )..... P. jariyae 8. Ventrolateral lobe of abdominal segment VII obscure, not produced into a pointed or rounded process when viewed laterally ( Figs. 25, 27, 31, 33 )...................................................................................9 8’. Ventrolateral lobe of abdominal segment VII well developed, forming a pointed or rounded process when viewed laterally ( Figs. 29, 35, 37 )..................................................................................... 12 9. Connexival spines stout ( Figs. 30–33 ).................................................................... 10 9’. Connexival spines elongate ( Figs. 24–27 )................................................................. 11 10. Connexival spine and dorsolateral lobe of abdominal segment VII subequal in length ( Figs. 32, 33 )................. P.kra 10’. Connexival spines much shorter than the dorsolateral lobe ( Figs. 30, 31 ).................................. .. P. j a r iy a e 11. Connexival spines inflected mesad at base ( Fig. 24 )..................................................... P. fang 11’. Connexival spines straight, and sometimes crossing ( Fig. 26 )....................................... P. hemmingseni 12. Connexival spines curved and crossing ( Fig. 34 )................................................... P. tennaserim 12’. Connexival spines straight ( Figs. 28, 29, 36, 37 )............................................................ 13 13. Ventrolateral lobe of abdominal segment VII digitate, ventral margin concave ( Fig. 29 )...................... P. hylactor 13’. Ventrolateral lobe of abdominal segment VII nearly right angled, ventral margin convex ( Fig. 37 )............... P. tigrina