Genus Cyclocypris Brady & Norman, 1889
Superfamily: Cypridoidea Baird, 1845
Family: Candonidae Kaufmann, 1900
Subfamily: Cyclocypridinae Kaufmann, 1900
Two species have been reported from Japan:
1. Cyclocypris diebeli Absolon, 1973
Left side view of a female Cyclocypris diebeli, length about 0.55 mm.
Dorsal view of a female Cyclocypris diebeli, anterior to left, length about 0.55 mm.
External view of a right valve of a female Cyclocypris diebeli length 540 microns.
Detail of the anterior margin of the right valve. A series of tiny plates form a flange along the anterior edge of the valve.
The male sexual organ of Cyclocypris diebeli, length 132 microns.
- Additional figures in: Matzke-Karasz et al. 2004.
- Habitat: Marsh (Matzke-Karasz et al. 2004).
- Mode of life: Nektobenthic.
- Reproductive mode: Sexual.
- Known distribution: Kushiro Shitsugen, Eastern Hokkaido. Sub-fossils reported from Western Europe (Matzke-Karasz et al. 2004).
- References:
- ⚬ Matzke-Karasz, R, Smith, R. J. & Homma, M. 2004. Cyclocypris diebeli Absolon, 1973 (Ostracoda, Crustacea), extinct in Europe, extant in Japan. Journal of Natural History, 38, 1635-1663.
2. Cyclocypris ovum (Jurine, 1820)
External view of a left valve of a female Cyclocypris ovum length 475 microns.
External view of a right valve of a female Cyclocypris ovum length 488 microns.
- Additional figures in: Meisch 2000; Sywula 1974.
- Habitat: Pond in woodland (Hiruta & Smith 2001).
- Mode of life: Nektobenthic.
- Reproductive mode: Sexual.
- Known distribution: Japanese records restricted to Eastern Hokkaido (Hiruta & Smith 2001). General distribution Holarctic (Meisch 2000).
- References:
- ⚬ Hiruta, S. & Smith, R. J. 2001. Living Freshwater and Shallow marine Ostracoda in Eastern Hokkaido, Japan (Field excursion E): 107 - 125. In: Guidebook of Excursions of the 14th International Symposium on Ostracoda (ed. Ikeya, N.). Shizuoka, Japan, 147 pp.
- ⚬ 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.
- ⚬ Sywula, T. 1974. Fauna Slodkowodna Polski 24 - Malzoraczki (Ostracoda). Drukarnia Uniwersytetu Poznan, 315 pp.