OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Herpetocypris Brady & Norman, 1889

Superfamily: Cypridoidea Baird, 1845
Family: Cyprididae Baird, 1845
Subfamily: Herpetocypridinae Kaufmann, 1900

One species has been reported from Japan:

1. Herpetocypris chevreuxi (Sars, 1896)


Right side view of a female Herpetocypris chevreuxi, length 1.9 mm.



External view of a female left valve of Herpetocypris chevreuxi, length 1875 microns.



External view of a female right valve of Herpetocypris chevreuxi, length 1779 microns.


Additional figures in: Gonzalez Mozo et al. 1996 (carapace and appendages), Meisch 2000 (carapace and appendages), Okubo 2004 (carapace).
Habitat: From Japan reported from rice fields (Okubo 2004; Tanaka et al. 2015). Elsewhere known from small, stagnant water bodies, the littoral zones of lakes, swamps, and slow streams and rivers (Meisch 2000).
Mode of life: Nektobenthic (swimmer).
Reproduction mode: Asexual, males unknown.
Known distribution: In Japan, reported from Shiga Prefecture, Kumamoto Prefecture (Okubo 2004) and Shizuoka Prefecture (Tanaka et al. 2015). Elsewhere, known from the Azores, the Canary Islands, North Africa, Europe, Iran, central Asia, South Africa and South America (Meisch 2000).

References:
Gonzalez Mozo, M. E., Martens, K. & Baltanas, A. 1996. A taxonomic revision of European Herpetocypris Brady and Norman, 1889 (Crustacea, Ostracoda). Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie, 66, 93-132.

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. 2004. Nihon tansui san kaimijinko rui ni tsuite. Kabushikigaisha Sanmon Insatsusho, Okayama, Japan, 72pp. [In Japanese, privately published].

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 Herpetocypris chevreuxi
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
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 smooth
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 long, reaching to about end of claws
Fifth limb - morphologyMaxilliped
Sixth limb - segmentsFive segments
Sixth limb - setae on first segmentTwo setae
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 ramusElongate ramus with two claws and two setae
Caudal ramus - attachmentTriangular loop at ventral end