OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Heterocypris Claus, 1892

Superfamily: Cypridoidea Baird, 1845
Family: Cyprididae Baird, 1845
Subfamily: Cyprinotinae Bronshtein, 1947

Two species have been reported from Korea:

1. Heterocypris incongruens (Ramdohr, 1808)


Left side view of a female Heterocypris incongruens, length 1.8mm.



External view of a female left valve of Heterocypris incongruens, length 1660 microns.



External view of a female right valve of Heterocypris incongruens, length 1630 microns.


Additional figures in: Okubo 1972 (carapace and appendages), Kim & Min 1991 (carapace and appendages), Meisch 2000 (carapace and appendages).
Habitat: Rice fields, puddles.
Mode of life: Nektobenthic (swimmer).
Reproduction mode: Asexual in Korea. Sexual populations known from some areas in Europe, Turkey and North Africa (Meisch 2000).
Known distribution: Found throughout South Korea (Kim & Min 1991). Elsewhere, global distribution, a cosmopolitan species (Meisch 2000).

References:
Kim, W. & Min, G. S. 1991. Redescription of recent freshwater ostracods (Crustacea: Ostracoda) from Korea: A systematic study of four species of family Cyprididae. Korean Journal of Systematic Zoology, 7, 81-100.

Meisch, C. 2000. Freshwater Ostracoda of Western and Central Europe. In: Schwoerbel, J., Zwick, P., (Eds.), Süßwasserfauna von Mitteleuropa 8/3. Spektrum Akademischer Verlag, Heidelberg, Berlin 522 pp.

Okubo, I. 1972. Freshwater Ostracoda from Japan, IV. Heterocypris incongruens (Ramdohr, 1808). Review of Shujitsu Junior College, Okayama, 1, 73-84.

2. Heterocypris salina (Brady, 1868)


External view of a female left valve of Heterocypris salina, length 1117 microns.



External view of a female right valve of Heterocypris salina, length 1091 microns.



Detail of a female right valve of Heterocypris salina. In transmitted light at high magnification, a fine recticulation pattern is visible. Width of view 244 microns.


Additional figures in: Meisch (carapace and appendages), Smith et al. 2014 (carapace).
Habitat: Freshwater rock pool and a small ditch nearby, overlooking the sea (Smith et al. 2014). Elsewhere reported from fresh to slightly salty small waterbodies, near coasts and further inland (Meisch 2000).
Mode of life: Nektobenthic (swimmer).
Reproduction mode: Asexual.
Known distribution: Jeju Island (Smith et al. 2014). Generally, Holarctic (Meisch 2000).

References:
Meisch, C. 2000. Freshwater Ostracoda of Western and Central Europe. In: Schwoerbel, J., Zwick, P., (Eds.), Süßwasserfauna von Mitteleuropa 8/3. Spektrum Akademischer Verlag, Heidelberg, Berlin 522 pp.

Smith, R. J., Lee, J., & Chang, C. Y. 2014. Nonmarine Ostracoda (Crustacea) from Jeju Island, South Korea, including descriptions of two new species. Journal of Natural History, http://dx.doi.org/10.1080/00222933.2014.946110, 1-40.