Ptilomera

Raruanysong, Sajeemat, Vitheepradit, Akekawat & Sites, Robert W., 2014, Key to the species of Ptilomerinae (Hemiptera: Heteroptera: Gerridae) of Thailand and review of the fauna of the Tennaserim Mountain Range, Zootaxa 3852 (1), pp. 101-117 : 105

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

Figures

FIGURES 10 – 23. Terminal abdominal segments of male Ptilomera. P. fang in (10) dorsal and (11) ventral view; P. hemmingseni in (12) dorsal and (13) ventral view; P. hylactor in (14) dorsal and (15) ventral view; P. jariyae in (16) dorsal and (17) ventral view; P. k r a in (18) dorsal and (19) ventral view; P. tennaserim in (20) dorsal and (21) ventral view; P. tigrina in (22) dorsal and (23) ventral view. Figs. 20 – 21 are of holotype prior to extraction of genitalia.

FIGURES 24 – 37. Terminal abdominal segments of female Ptilomera. P. fang in (24) dorsal and (25) lateral view; P. hemmingseni in (26) dorsal and (27) lateral view; P. hylactor in (28) dorsal and (29) lateral view; P. j ar i y ae in (30) dorsal and (31) lateral view; P. k r a in (32) dorsal and (33) lateral view; P. tennaserim in (34) dorsal and (35) lateral view; P. tigrina in (36) dorsal and (37) lateral view.