An initial survey of aquatic and semi-aquatic Heteroptera (Insecta) from the Cardamom Mountains and adjacent uplands of southwestern Cambodia, with descriptions of four new species

in Tijdschrift voor Entomologie
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Previous collections of aquatic Heteroptera from Cambodia have been limited, and the biota of the country has remained essentially undocumented until the past several years. Recent surveys of aquatic Heteroptera in the Cardamom Mountains and adjacent Kirirom and Bokor plateaus of southwestern Cambodia, coupled with previous literature records, demonstrate that 11 families, 35 genera, and 68 species of water bugs occur in this area. These collections include 13 genus records and 37 species records newly listed for the country of Cambodia. The following four new species are described based on these recent surveys: Amemboa cambodiana n. sp. (Gerridae); Microvelia penglyi n. sp., Microvelia setifera n. sp. and Microvelia bokor n. sp. (all Veliidae). Based on an updated checklist provided herein, the aquatic Heteroptera biota of Cambodia as currently known consists of 78 species, and has an endemism rate of 7.7%, although these numbers should be considered provisional pending further sampling.

An initial survey of aquatic and semi-aquatic Heteroptera (Insecta) from the Cardamom Mountains and adjacent uplands of southwestern Cambodia, with descriptions of four new species

in Tijdschrift voor Entomologie

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References

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Figures

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    View to the southeast from a high point on the Kirirom Plateau at 715 m elevation, showing typical topography and vegetation of the southwestern Cambodian highlands. The forest in the foreground on the left side of the valley is dominated by Tenassarim pine (Pinus merkusii), while the forest on the right side of the valley is a wetter semi-deciduous broadleaf forest. The blue ridge in the distance is the Elephant Mountains, terminating in the Bokor Plateau visible in the left-central portion of the uplift, and supporting montane evergreen broadleaf rainforest.

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    Wet lowland evergreen broadleaf forest near Thmar Bang village at about 400 m elevation, on the southeastern flank of the Cardamom Mountains facing the Gulf of Thailand.

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    Exemplar forest formations of the southwestern Cambodian highlands. — 3, Wet montane broadleaf rainforest, Bokor Plateau summit, 1000 m; 4, middle elevation pine forest dominated by Pinus merkusii, Kirirom Plateau, 700 m; 5, semi-deciduous broadleaf forest, Cardamom Mountain foothills at Rolak village, 150 m; 6, dry deciduous broadleaf forest dominated by Dipterocarpus obtusifolius, northeastern base of Kirirom Plateau, 100 m.

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    Exemplar freshwater habitats of southwestern Cambodia. — 7, Stream in bed of sandstone plates on the road to Thmar Bang village, 355 m elev., Koh Kong Prov., CL 6017; 8, stream in semi-deciduous broadleaf forest at Rolak village, along the eastern edge of the Cardamom Mountains, 145 m elev., Kampong Speu Prov., CL 6041; 9, lowland stream bordered by bamboo east of Aural, flowing in a bed of sand and granitic cobbles derived from the Phnom Aural massif, 75 m elev., Kampong Speu Prov., CL 6044; 10, upland pond surrounded by montane rain forest on the Bokor Plateau, 985 m elev., Kampot Prov., CL 6036.

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    Map of aquatic Heteroptera collecting sites in southwestern Cambodia, plotted against vegetation classes. Dark green areas indicate semi-deciduous or evergreen broadleaf forests; pale green areas indicate deciduous dipterocarp forest; tan areas indicate cultivated lowlands; pale blue areas indicate wetlands.

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    Amemboa species, dorsal habitus, appendages omitted. Figs 12, 13. A. burmensis, paratype specimens from Burma, Shingbwiyang. 12. Apterous male. 13. Apterous female. Figs 14–16. A. cambodiana, n. sp., specimens from Cambodia, Bokor Plateau, CL 6037. 14. Apterous male. 15. Apterous female. 16. Macropterous male.

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    Amemboa species, male right fore femur, dorsal view. 17. A. kumari, paratype specimen from India, Karnataka, Mudigere. 18. A. burmensis, paratype specimen from Burma, Shingbwiyang. 19. A. cambodiana, n. sp., specimen from Cambodia, Kampot Prov., Bokor Plateau, CL 6037.

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    Amemboa cambodiana n. sp., male genitalia, specimen from Cambodia, Kampot Prov., Bokor Plateau, CL 6037. 20. Proctiger, dorsal view. 21. Pygophore, ventral view. 22. Pygophore, left ventrolateral oblique view, showing form of posterior projection. 23. Endosoma, lateral view. 24. Endosoma, dorsal view.

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    Microvelia bokor n. sp., male foreleg showing distal expansion of fore tibia; specimen from Cambodia, Kampot Prov., stream on Bokor Plateau, CL 6035.

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    Microvelia penglyi n. sp., dorsal habitus; specimens from Cambodia, Pursat Prov., Vealveang, CL 6024. 25. Micropterous male. 26. Micropterous female.

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    Microvelia setifera n. sp., dorsal habitus; specimens from Cambodia, O An Dart River, CL 6015. 32. Micropterous male. 33. Micropterous female.

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    Microvelia penglyi n. sp., male terminal abdominal ventrite VII, ventral view; specimen from Cambodia, Pursat Prov., Vealveang, CL 6024.

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    Microvelia penglyi n. sp., male genitalic structures; specimens from Cambodia, Kampong Speu Prov., Kirirom Plateau, CL 6047. 28. Proctiger. 29. Paramere, lateral view. 30. Paramere, alternate oblique view. 31. Posterior margin of pygophore, showing angulate lateral lobes.

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    Microvelia bokor n. sp., micropterous male, dorsal habitus; specimen from Cambodia, Kampot Prov., stream on Bokor Plateau, CL 6035.

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    Microvelia setifera n. sp., male genitalic structures; specimen from Cambodia, Koh Kong Prov., O An Dart River, CL 6015. 34. Proctiger. 35. Paramere, oblique view. 36. Paramere, alternate lateral view.

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    Microvelia bokor n. sp., male genitalic structures; specimen from Cambodia, Kampot Prov., stream on Bokor Plateau, CL 6035. 39. Proctiger. 40. Paramere, lateral view. 41. Paramere, alternate oblique view.

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    Rhagovelia species, dorsal habitus. 42. R. inexpectata, apterous female, specimen from Cambodia, Sihanoukville Prov., stream below Kirirom hydroelectric plant, CL 6039. 43. R. tebakang, apterous female, specimen from Cambodia, Koh Kong Prov., stream on Koh Kong to Pursat road, CL 6023.

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    Rhagovelia species, legs. 44. R. inexpectata, male left middle femur, dorsal view, showing stout spines ventrally near base; specimen from Cambodia, Sihanoukville Prov., stream below Kirirom hydroelectric plant, CL 6039. 45. R. inexpectata, male left hind leg, dorsal view; specimen from Cambodia, Sihanoukville Prov., stream below Kirirom hydroelectric plant, CL 6039. 46. R. tebakang, male left hind leg, dorsal view, note spinules on hind trochanter; specimen from Cambodia, Koh Kong Prov., stream on Koh Kong to Pursat road, CL 6023.

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    Rhagovelia species, male right paramere, lateral view. 47. R. tebakang, specimen from Cambodia, Koh Kong Prov., stream on Koh Kong to Pursat road, CL 6023. 48–50. R. inexpectata, showing geographic variation in shape of paramere apex. 48. Specimen from Cambodia, O Sarb Morth stream near Vealveang, CL 6024. 49. Specimen from Cambodia, Touk Neong River, CL 6020. 50. Specimen from Vietnam, Quang Ngai Prov., NE of Kontum, CL 4297.

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    Tetraripis zetteli, apterous male, dorsal habitus; specimen from Cambodia, Kampong Speu Prov., stream near Krong Chbar Mon, CL 6045.

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    Nychia sappho, macropterous male, specimen from Cambodia, Kampong Speu Prov., Thom River near Rolak Kong Cheung village, CL 6042. Fig. 52. Dorsal habitus. Fig. 53. Ventral habitus.

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    Nychia sappho, intact male genitalia, left lateral view, with major structures labeled; specimen from Cambodia, Kampong Speu Prov., stream near Chambok village, CL 6034.

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    Nychia sappho, brachypterous forms, dorsal habitus. 55. Female specimen from Cambodia, Kampong Speu Prov., Thom River near Rolak Kong Cheung village, CL 6042. 56. Female specimen from Indonesia, New Guinea, Papua Prov, nr. Timika, CL 7053.

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    Nychia sappho, brachypterous forms, lateral view of head and thorax showing form of antennae and lateral pronotal fovea. 57. Female specimen from Cambodia, Kampong Speu Prov., Thom River near Rolak Kong Cheung village, CL 6042. 58. Female specimen from Indonesia, New Guinea, Papua Prov, nr. Timika, CL 7053.

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