Potamobates tumaquensis, Padilla-Gil, Dora N. & Damgaard, Jakob, 2011

Padilla-Gil, Dora N. & Damgaard, Jakob, 2011, A new species of Potamobates Champion from Colombia with a re-analysis of phylogenetic relationships (Hemiptera: Gerridae), Zootaxa 2879, pp. 41-49 : 44-45

Key to the species of Potamobates

modified after Polhemus & Polhemus (1995) and Cognato (1998), to include the species P. shuar Buzzetti and P. tumaquensis n. sp.

1 Pronotum medially with a roughly parallel-sided and linear, longitudinal yellow stripe. Segments IX and X not or rotated 30º to 45º............................................................................................... 2

- Pronotum medially with a roughly triangular or wedge-shaped yellow mark. Segments IX and X rotated variably in each species, from 5º to 90º.................................................................................... 5

2 Male abdominal segment VIII not modified; segments IX and X not rotated. Female with short and sharp connexival spines, and a pair of ventral prolongations; anal cone not tubular (see Hungerford 1937, pl. II; habitus, Andersen 1982, fig. 438)......................................................................................... thomasi Hungerford

- Male abdominal segment VIII modified, with an asymmetrical tumescence or tooth; segments IX, X rotated at most 30º to 45º. Female without connexival spines or ventral prolongations; anal cone not tubular................................... 3

3 Mesonotum of apterous forms without light markings, except golden or silvery setae forming stripes or spots. Male abdominal segment VIII broad, almost parallel sided distally modified asymmetrically. Female abdominal segment VIII dorsally produced into a long spine; ventrally anal cone long, curved and tubular............................................. 4

- Mesonotum of apterous forms with median yellow longitudinal stripe (rarely completely dark). Male abdominal segment VIII narrow, tapering posteriorly, not expanded distally, and with only a small tooth. Female abdominal segment short finger-like protuberance (anal cone).................................................................... .. horvathi Esaki

4 Vertex of head largely yellow, with a large elongate black region anteriorly, mostly anterior to the eyes. Male abdominal segment VIII modified, with an asymmetrical tumescence. Female abdominal segment VIII dorsally with a moderately long process.............................................................................. osborni Drake & Harris

- Vertex of head largely black, and with a small elongate yellow spot between eyes. Male abdominal segment VIII modified, with an asymmetrical lobe bearing two blunt teeth. Female abdominal segment VIII dorsally with moderately long process....................................................................................... bidentatus Champion

5 Male abdominal segment VIII not or slightly modified, segments IX and X rotated a maximum of 45º. Female without connexival prolongations..................................................................................... 6

- Male abdominal segment VIII very modified, segments IX, X rotated about 90º. Female with large connexival prolongations....................................................................................................8

6 Male abdominal segment IX dark or distally light; process of proctiger spatulate or acuminate; segments IX, X rotated variably in each species, from 5º to 45º. Female abdominal segment VIII dorsally triangular and ventrally triangular or semi-triangular.................................................................................................... 7

- Male abdominal segment IX distally dark; process of proctiger acuminate, exposed; segments IX, X usually rotated 30º to 45º. Female abdominal segment VIII dorsally produced into long spine-like structure; ventrally with an asymmetrical spoonshaped structure…. manzanoae Polhemus & Polhemus

7 Male abdominal segment IX distally light; process of proctiger spatulate, usually hidden; segments IX, X rotated 5º to 10º. Female abdominal segment VIII dorsally triangular, ventrally with a triangular structure, lacking anal cone …. unidentatus Champion

- Male abdominal segment IX dark; process of proctiger acuminate, exposed; segments IX, X usually rotated 30º to 45º. Female abdominal segment VIII dorsally triangular, ventrally with a semi-triangular structure, second genital exposed as a cylindrical

segment............................................................................... tumaquensis n. sp. 8 Male abdominal segment VIII variably modified. Female abdominal segment VIII dorsally with short prolongation and then abdomen truncate or with long lobes...................................................................... 9

- Male abdominal segment VIII longer, modified, with spinose or dentate lobes on right side. Female abdominal segment VIII dorsally with short to long median digitate or spine-like prolongation (polymorphic, sometimes short), but never truncate or with lobes.......................................................................................... 10

9 Male abdominal segment VIII short, with distal tumescence of left side. Female abdominal terminalia truncate....................................................................................... carvalhoi Polhemus & Polhemus

- Male abdominal segment VIII longer, with distal dentate lobe on left side. Female abdominal terminalia with two long, slender lobes................................................................................... .. shuar Buzzetti

10 Distal lobe on right side of male abdominal segment VIII forming a single acute angle posteroventrally. Female abdominal segment VIII dorsally produced into a long poaterodorsally directed spine............................... vivatus Drake

- Distal lobe on right side of male abdominal segment VIII variably formed, but not forming a single acute angle posteroventrally. Female abdominal segment VIII dorsally with short or long process, but not posterodorsally directed............. 11

11 Distal lobe on right side of male abdominal segment VIII forming a posteriorly directed acute angle, plus a posterodorsally directed twisted spatulate lobe. Female abdominal segment VIII dorsally short, triangular; ventrally with a long process extending posteriorly far beyond tip of dorsal triangular plate on left side..................... .. woytkowskii Hungerford

- Distal lobe on right side of male abdominal segment VIII variably formed, but not forming a single acute angle posteroventrally. Female abdominal segment VIII dorsally with short or long processs; ventrally with short or long processs, but not extending posteriorly far beyond dorsal structure............................................................ 12

12 Distal lobe on right side of male abdominal segment VIII forming a posteriorly directed short spine, plus a posteroventrally directed acute angle. Female abdominal segment VIII dorsally produced into a long posteriorly directed finger-like process; ventrally with a long twisted process on left side extending posteriorly half the length of dorsal process............................................................................................. spiculus Polhemus & Polhemus

- Distal lobe on right side of male abdominal segment VIII variably formed, but not forming a short spine, plus an acute angle. Female abdominal segment VIII dorsally with short or long process; ventrally with short flap-like process not extending far posteriorly.......................................................................................... 13

13 Distal lobe on right side of male abdominal segment VIII forming a posteriorly directed twisted spatulate protuberance. Female abdominal segment VIII dorsally triangular; ventrally with a short flap-like lobe on left side. .. peruvianus Hungerford

- Distal lobe on right side of male abdominal segment VIII forming two ventrally or posteroventrally directed spines. Female abdominal segment VIII dorsally with short flap-like process not extending far posteriorly........................... 14

14 Distal lobe on right side of male abdominal segment VIII forming two postero-ventrally directed teeth, ventral one longer; process of proctiger bifurcate distally. Female abdominal segment VIII dorsally with short stout process, directed postero-ventrally; ventrally with short flap-like process covering left side of dorsal process..................... variabilis Hungerford

- Distal lobe on right side of male abdominal segment VIII forming two ventrally or posteroventrally directed spines of about equal length; process of proctiger not bifurcate distally. Female abdominal segment VIII dorsally with short or long process; ventrally with short flap-like process..................................................................... 15

15 Distal lobe on right side of male abdominal segment VIII with two widely spaced postero-ventrally directed spines; process of proctiger extends laterally between and slightly beyond the two widely spaced spines. Female abdominal segment VIII with short dorsal triangular process and short ventral flap-like process............................................... 17

- Distal lobe on right side of male abdominal segment VIII forming two ventrally directed closely spaced spines of about equal length. Female abdominal segment VIII dorsally with short or long process; ventrally with short flap-like process........16

16 Distal lobe on right side of male abdominal segment VIII forming two ventrally directed stout spines with a pronounced rounded incision between. Female abdominal segment VIII dorsally with short or long process; never bent ventral; ventral short flap-like process with left lobe only developed............................................. tridentatus Esaki

- Distal lobe on right side of male abdominal segment VIII forming two ventrally directed stout spines with a shallow triangular incision between. Female abdominal segment VIII dorsally with short or long process, often bent ventral; ventral short flaplike process with both right and left lobes developed................................ anchicaya Polhemus & Polhemus

17 Distance between the two widely spaced posteroventrally directed spines on the lobe on right side of male abdominal segment VIII shorter (0.3–0.4); proctiger with a curved, flap, projection. Female abdomen with ventral short flap-like process embracing short triangular process of segment VIII................................................. williamsi Hungerford

- Distance between the two widely spaced posteroventrally directed spines on the lobe on right side of male abdominal segment VIII longer (0.4–0.5); proctiger with an uncurved, 90º rotated, projection. Female abdomen with ventral short flap-like process produced asymmetrically, left side extended to middle of the connexival digitate lobe, paralleling, never embracing, the short triangular process of segment VIII............................................................ sumaco Cognato