Aphelocheirus, Westwood, 1833

Polhemus, Dan A. & Polhemus, John T., 2013, Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. Xi. Infraorder Nepomorpha- Families Naucoridae And Aphelocheiridae, Raffles Bulletin of Zoology 61 (2), pp. 665-686 : 681-682

KEY TO THE SPECIES OF APHELOCHEIRUS

occurring in Singapore and Peninsular Malaysia (modified from D. Polhemus & J. Polhemus, 1989)

1. Small species, body length less than 5 mm (subgenus Micraphelocheirus ) ................................................................... ........................... Aphelocheirus malayensis Zettel & Papáček

– Larger species, body length exceeding 7 mm (subgenus Aphelocheirus ).........................................................................2

2. Male with conspicuous projecting tab on abdominal ventrite IV ( Fig. 49 ); female subgenital plate very short and truncate, broader than long, with two long hair tufts on posterior margin ( Fig. 50 ) ........................... A. grik D. Polhemus & J. Polhemus

– Male lacking a projecting tab on abdominal ventrite IV; female subgenital plate longer, shape roughly triangular or elongate trapezoidal with elongate lateral hair tufts ( Figs. 44 , 57 )......3

3. Male with dark, raised, ovate swelling on ventral face of hind femur ( Fig. 45 ); body length in both sexes less than 8.0 mm; head produced ahead of eyes for 0.70 the dorsal length of an eye ( Figs. 41, 42 )... A. femoratus D. Polhemus & J. Polhemus

– Male lacking dark, raised, ovate swelling on ventral face of hind femur; body length in both sexes exceeding 8.5 mm; head produced ahead of eyes for 0.60 the dorsal length of an eye ( Figs. 53, 54 ) ........ A. malayanus D. Polhemus & J. Polhemus

Figures

Figs. 47–52.Aphelocheirus (Aphelocheirus) grik D. Polhemus & J. Polhemus, structural details. 47. Brachypterous male, dorsal habitus, Malaysia, Perak, Grik. 48. Macropterous female, dorsal habitus, specimen from Thailand, Chiang Mai Prov.. Mae Ping River. 49. Male ventral abdomen, showing tab on abdominal ventrite IV. 50. Female subgenital plate. 51. Male parameres and phallotheca. 52. Proacetabula.

Figs.41–46.Aphelocheirus (Aphelocheirus) femoratus D. Polhemus & J. Polhemus, structural details, specimens from Malaysia, Pahang, Cameron Highlands. 41. Brachypterous male, dorsal habitus. 42. Macropterous male, dorsal habitus. 43. Male parameres and phallotheca. 44. Female subgenital plate. 45. Male hind femur, ventral view. 46. Proacetabula.

Figs.53–57.Aphelocheirus (Aphelocheirus) malayanus D.Polhemus & J. Polhemus, structural details. 53. Brachypterous male, dorsal habitus, specimen from Malaysia, Perak, near Jeli. 54. Macropterous female, dorsal habitus, specimen from Malaysia, Pahang, Cameron Highlands. 55. Male parameres and phallotheca. 56. Proacetabula. 57. Female subgenital plate.