OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Cavernocypris Hartmann, 1964

Superfamily: Cypridoidea
Family: Cyprididae
Subfamily: Cypridopsinae

One species has been reported from Japan:

Cavernocypris cavernosa Smith, 2011

2011 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.

References:
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 overlapLeft valve overlaps right along ventral margin
Carapace - margin structure - septaNo septa present
Carapace - margin structure - ridges on inner calcified lamellaOn left valve. !Bit difficult to see!
Carapace - dorsal view - female with brood pouchBrood pouch not visible
Carapace - lateral view - ventral marginVentral margin approximately straight to concave
Carapace - lateral view - valve heightLeft and right valves similar height
Carapace - internal viewAnterior calcified inner lamella wider than posterior one
Carapace - ornamentation - denticlesNo denticles near ventral margin
Carapace - ornamentation - sulcusNo sulcus
Carapace - ornamentation - surfaceSurface pitted
Carapace - width/length ratio (w/l)Less than 0.4 (slender species)
Antennule - segmentsSeven moveable segments
Antennule - Rome organRome organ present
Antenna - exopoditeExopodite reduced to small segment
Antenna - swimming setaeSwimming setae reduced, not reaching to end of claws
Fifth limb - morphologyMaxilliped
Sixth limb - segmentsFive segments
Sixth limb - setae on first segmentOne seta
Sixth limb - h3 seta on final segmentH3 seta short; much shorter than half length of claw
Seventh LimbCleaning limb, with a pincer at end
Seventh Limb - segmentsThree segments
Seventh Limb - first segmentThree setae
Caudal ramusReduced ramus with two setae
Caudal ramus - attachmentWith no caudal ramus attachment