at the Lake Biwa Museum, Japan
Robin James Smith
Genus Cavernocypris Hartmann, 1964
One species has been reported from Japan:
Cavernocypris cavernosa Smith, 20112011 Cavernocypris cavernosa n. sp. - Smith: 16-20, figs 1A-H, 2.
Left side view of a female Cavernocypris cavernosa, length about 0.6 mm.
External view of a female left valve of Cavernocypris cavernosa, length 590 microns. The surface of the carapace is covered in numerous small pits.
External view of a female right valve of Cavernocypris cavernosa, length 573 microns.
Additional figures in:
Smith 2011 (carapace and appendages).
Habitat: Poorly sorted gravels of springs and rivers.
Mode of life: Interstitial.
Reproductive mode: Asexual, males unknown.
Known distribution: Shiga and Shizuoka Prefectures, Japan.
Smith, R. J. 2011. Groundwater, spring and interstitial Ostracoda (Crustacea) from Shiga Prefecture, Japan, including descriptions of three new species and one new genus. Zootaxa, 3140, 15-37.
Tanaka, H., Kotorii, H., Yokozawa, K., Wakabayashi, F., Kimoto, K. & Sano, K. 2015. Distribution and occurrence of freshwater Ostracoda (Crustacea) from southwest region of Mt. Fuji. TAXA, Proceedings of the Japanese Society of Systematic Zoology, 38, 26-41. [In Japanese with English abstract.]
|Key characters||Cavernocypris cavernosa|
|Carapace - ventral valve overlap||Left valve overlaps right along ventral margin|
|Carapace - margin structure - septa||No septa present|
|Carapace - margin structure - ridges on inner calcified lamella||On left valve. !Bit difficult to see!|
|Carapace - dorsal view - female with brood pouch||Brood pouch not visible|
|Carapace - lateral view - ventral margin||Ventral margin approximately straight to concave|
|Carapace - lateral view - valve height||Left and right valves similar height|
|Carapace - internal view||Anterior calcified inner lamella wider than posterior one|
|Carapace - ornamentation - denticles||No denticles near ventral margin|
|Carapace - ornamentation - sulcus||No sulcus|
|Carapace - ornamentation - surface||Surface pitted|
|Carapace - width/length ratio (w/l)||Less than 0.4 (slender species)|
|Antennule - segments||Seven moveable segments|
|Antennule - Rome organ||Rome organ present|
|Antenna - exopodite||Exopodite reduced to small segment|
|Antenna - swimming setae||Swimming setae reduced, not reaching to end of claws|
|Fifth limb - morphology||Maxilliped|
|Sixth limb - segments||Five segments|
|Sixth limb - setae on first segment||One seta|
|Sixth limb - h3 seta on final segment||H3 seta short; much shorter than half length of claw|
|Seventh Limb||Cleaning limb, with a pincer at end|
|Seventh Limb - segments||Three segments|
|Seventh Limb - first segment||Three setae|
|Caudal ramus||Reduced ramus with two setae|
|Caudal ramus - attachment||With no caudal ramus attachment|