Hemicypris ovata Sars, 1903

Savatenalinton, Sukonthip, 2014, Ostracods (Crustacea: Ostracoda) from the floodplain of the Chi River, Mahasarakham Province, Northeast Thailand, with the first record of male Tanycypris siamensis Savatenalinton & Martens, 2009, Zootaxa 3838 (2), pp. 195-206 : 204

Hemicypris ovata Sars, 1903

( Fig. 5 C)

This species was described by Sars (1903) based on specimens from Sumatra, Indonesia and later redescribed by Victor & Fernando (1981) based on type material and additional specimens from the Philippines. There are several differences between the drawings made by Sars and those of Victor & Fernando. The morphology of the Thai specimens is more similar to Victor & Fernando’s drawings. The present record is the first for Thailand and it is the third Hemicypris species reported from the country, after H. mizunoi Okubo, 1990 and H. reticulata (Klie, 1930) (see Savatenalinton & Martens 2008). It was found in 7 localities in the present study: 4 small oxbow lakes and 3 stations of the Chi River itself. Only females were found with a total of 12 specimens. The species occurred in Thai localities in water temperatures of 26.3–33.9 ºC, a DO of 2.71–5.80 mg /L and a pH of 6.4–7.2.

Figures

FIGURE 5. Scanning electron micrographs of ostracods found in the studied floodplain. A. Ilyocypris monstrifica (Norman, 1862), dorsal view of carapace. B. Limnocythere stationis (Vávra, 1891), dorsal view of carapace. C. Hemicypris ovata Sars, 1903, left lateral view of carapace. D. Physocypria crenulata (Sars, 1903), right lateral view of carapace. E. Bradleystrandesia weberi (Moniez, 1892), right lateral view of carapace. F. Pseudocypretta maculata Klie, 1932, right lateral view of carapace. Scale bars: 100 Μm for A – D, F and 200 Μm for E. Arrows point toward the anterior end.