Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 89. (Budapest 1997)

Zettel, H. ; Chen, P.: Three new taxa of Amemboa Esaki, 1925, from Thailand and Viet Nam (Heteroptera: Gerridae)

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICI Volume 89. Budapest, 1997 pp. 93-101. Three new taxa of Amemboa Esaki, 1925, from Thailand and Viet Nam (Heteroptera: Gerridae) H. ZETTEL & P. CHEN Naturhistorisches Museum in Wien, 2. Zoologische Abteilung Burgring 7, A-10I4 Wien, Austria ZETTEL, H. & CHEN, P. (1997): Three new taxa of Amemboa Esaki, 1925, from Thailand and Viet Nam (Heteroptera: Gerridae). - Annls hist.-nat. Mus. natn. hung. 89: 93-101. Abstract - Amemboa (s. str.) aquafrigida sp. n. from Thailand (Phetchabun, Chayaphum), Amemboa (s. str.) schwendingeri sp. n. from Thailand (Mae Hong Son, Chiang Mai), and Amemboa (Amemboides) veláris orientális ssp. n. from Viet Nam (Lam Dong) are described and figured. A population of Amemboa veláris is described from Thailand (Phetchabun) which is geographically and morphologically intermediate between A. veláris veláris (from Thailand: Chiang Mai) and A. veláris orientális ssp. n. A checklist of the Amemboa species of Thailand is provided. With 13 figures. INTRODUCTION The eotrechine genus Amemboa ESAKI was revised by POLHEMUS & ANDERSEN (1984) who recognized 23 species. One of them, R. riparia POLHEMUS & ANDERSEN, 1984, turned out to be a synonym (ZETTEL & CHEN 1996). Since this revision only three species were described (ZETTEL 1995, ZETTEL & CHEN 1996). Most of the 25 known species are distributed in Indochina and Malaysia (16 species), but the fauna of Thailand is especially rich (10 described species including the records of A. speciosa POLHEMUS & ANDERSEN, 1984, in our samplings; see checklist). So it was rather surprising to discover two undescribed species in North and Northeast Thailand. These two new species, here described, belong to the subgenus Amemboa s. str. and have distinctive characters which separate them easily from most other species. Amemboa aquafrigida sp. n. and A. schwendingeri sp. n. are closely related with A. prostata POLHEMUS & ANDERSEN, 1984. These three species form a monophyletic group based on two characters in male genitalia: a bifid medium part of the proctiger and a long and slender apical part of the pygophor. Further, a new subspecies of A. veláris POLHEMUS & ANDERSEN, a species belonging to the subgenus Amemboides, is described from Viet Nam. ZETTEL & CHEN (1996) mentioned differences between females of this species from North Thailand and Viet Nam. However, at that time not enough material was available to prove whether or not these differences were individual variations. Since then, more material has been collected