Abstract
Parategastes pholpunthini sp. n. is described and illustrated based on material collected in the Thale Noi Lake, Phatthalung province, southern Thailand. This species can be distinguished from its congeners by the number segments of female antennule, the lengths of rami and basis of P1, the shape of middle inner seta of P4 exp-3, shape of P5, and relative lengths of spine at apically of baseoendopod of P5. The differences among Parategastes species are pointed out and they are compared with the new species. An identification key to species of the genus Parategastes are proposed.
Highlights
The family Tegastidae Sars, 1904 is characterised as being laterally compressed, amphipod-like, strongly chitinous and well sculptured (Huys et al 1996)
P. sphaericus (Claus, 1863) had been found in many localities such as from the Mediterranean, the North American Atlantic coast, European Atlantic coast (Lang 1948) Naples, Italy (Claus 1863), Chilka Lake, India (Sewell 1924) and Tunis, Tunisia (Monard 1935) whereas other species had been recorded in one locality, P. chalmersi (Thompson & Scott, 1903) from Ceylon, Sri Lanka (Thomson and Scott 1903); P. haphe Leigh-Sharpe, 1936 was described from Naples (Leigh-Sharpe 1936); P. herteli Jakobi, 1953 from Santa Catarina, Brazil (Jakobi 1953); P. caprinus Wellershaus, 1970 from Cochin backwater, South India (Wellershaus 1970); P. coetzeei Kunz, 1980 from the Wilderness Lakes, South Africa (Kunz 1980); and P. conexus Humes, 1984 from Moluccas, Indonesia (Humes 1984)
Four Parategastes species have been recorded in the Oriental region (Sewell 1924, Thompson and Scott 1903, Humes 1984, Wellershaus 1970). They comprises of Parategastes sphaericus, P. chalmersi, P. conexus and P. caprinus
Summary
The family Tegastidae Sars, 1904 is characterised as being laterally compressed, amphipod-like, strongly chitinous and well sculptured (Huys et al 1996). To date, this family comprises approximately 60 species in six genera. Huys et al (1996) proposed the number of segments in P2-P4 to distinguish genus Parategastes from other genus in family Tegastidae. This genus has so far accommodated six valid species and one species incertae sedis (Parategastes haphe) (Wells 2007). This paper will provide detailed description and illustrations of both female and male of the new species collected from Thale Noi Lake, southern Thailand and propose a key to species in genus Parategastes
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