OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Bradleycypris McKenzie, 1982

Superfamily: Cypridoidea Baird, 1845
Family: Cyprididae Baird, 1845
Subfamily: Cypricercinae McKenzie, 1971

One species has been reported from Japan:

1. Bradleycypris vittata (Sars, 1903)

Show synonymy list

1903 Cypris vittata n. sp. - Sars: 22, pl. II, figs 3a-c.
1916 Cypris (Strandesia) vittata Sars, 1903 - Gurney: 339.
1937 Strandesia vittata (Sars, 1903) - Tressler: 197, new combination.
1981 Strandesia vittata (Sars, 1903) - Victor & Fernando: 509-512, figs 216-232.
1983 S. vittata - Broodbakker: 342, 344, 361.
1990 Strandesia vittata (Sars, 1903) - Okubo: 46, figs 3 a-e.
2000 Strandesia vittata (Sars, 1903) - Okubo: 118, figs 33 a-e.
2004 Strandesia vittata (Sars, 1903) - Okubo: 36, figs 18, c, d, i.
2005 Strandesia vittata (Sars, 1903) - Karanovic: 91, 93.
2008 Strandesia vittata (Sars, 1903) - Smith & Matzke-Karasz: table 1, pl. 2, fig. 3.
2009 Strandesia vittata (Sars, 1903) - Yu et al.: 43.
2009b Strandesia vittata (Sars, 1903) - Savatenalinton & Martens: 38.
2009a Bradleycypris vittata (Sars, 1903) - Savatenalinton & Martens: 3, 6, 18, 44, 45, new combination.
2011 Bradleycypris vittata (Klie, 1934) - Martens & Savatenalinton: 17.
2012 Bradleycypris vittata (Sars 1903a) - Karanovic: 365, Fig. 114d.
2012 Bradleycypris vittata (Sars, 1903) - Chang et al.: 3-4, Fig. 2A-C, Table 1.
2014 Bradleycypris vittata (Sars, 1903) - Zhai & Zhao: 1011-1015, Figs 21-23.

Partial synonymy list.

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Left view of a female Bradleycypris vittata, length about 0.75 mm.


External view of female left valve of Bradleycypris vittata, length 764 microns. The surface is covered with many small pits.


External view of female right valve of Bradleycypris vittata, length 742 microns. The two valves are noticeably asymmetrical.

Additional figures in: Okubo 1990 (as Strandesia vittata) (carapace and caudal ramus); Okubo 2004 (as Strandesia vittata) (carapace); Savatenalinton & Martens 2010 (carapace and appendages); Smith et al. 2011 (carapace); Chang et al. 2012 (carapace); Zhai & Zhao 2014 (carapace and appendages).
Habitat: Swamps, rivers, rice fields, irrigation ponds and shore of Lake Biwa in Japan.
Mode of life: Nektobenthic (swimmer).
Reproductive mode: Males only reported from Thailand (Savatenalinton & Martens, 2010). Elsewhere probably asexual.
Known distribution: Shiga Prefecture (Smith et al. 2011). Elsewhere, China (Sars 1903), South Korea (Chang et al. 2012), Thailand (Savatenalinton & Martens 2010), Indonesia (Tressler 1937) and Sri Lanka (Gurney 1916).

References:
Broodbakker, N. W. 1983. The genus Strandesia and other Cypricercini (Crustacea, Ostracoda) in the West Indies. Bijdragen tot de Dierkunde, 53, 327-368.

Chang, C. Y., Lee, J. & Smith, R. J. 2012. Nonmarine ostracods (Crustacea) from South Korea, including a description of a new species of Tanycypris Triebel (Cyprididae, Cypricercinae). Zootaxa, 3161, 1-19.

Gurney, R. 1916. On some freshwater Entomostraca from Ceylon. Proceedings of the Zoological Society of London, 1, 333-343.

Martens, K. & Savatenalinton, S. 2011. A subjective checklist of the Recent, free-living, non-marine Ostracoda (Crustacea). Zootaxa, 2855, 1-79.

Karanovic, I. 2005. On the genus Strandesia Stuhlmann, 1888 (Crustacea, Ostracoda, Cyprididae) with description of Strandesia kimberleyi n. sp. and a key to the extant species of the genus. Contributions to Zoology, 74, 77-95.

Karanovic, I. 2012. Recent Freshwater Ostracods of the World. Springer, 608pp.

Okubo, I. 1990. Sixteen species of freshwater Ostracoda from Japan. Bulletin of the Biogeographical Society of Japan, 45, 39-50.

Okubo, I. 2000. Ostracoda. In: Mizuno, T. & Takahashi, E. (Eds.), An illustrated guide to freshwater zooplankton in Japan. Tokai University Press, Hadano, 96–123 [in Japanese].

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

Sars, G.O. 1903. Fresh-water Entomostraca from China and Sumatra. Archiv for Mathematik og Naturvidenskab, 25, 3-44.

Savatenalinton, S. & Martens, K. 2009a. Generic revision of Cypricercinae McKenzie, 1971 (Crustacea, Ostracoda), with the description of three new genera and one new species and a phylogenetic analysis of the subfamily. Hydrobiologia, 632, 1-48.

Savatenalinton, S. & Martens, K. 2009b Redescription of the type species of Strandesia Stuhlmann, 1888 and Cypricercus Sars, 1895 (Crustacea, Ostracoda, Cypricercinae), with a description of a new species of Cypricercus from South Africa. Zootaxa, 2007, 1-42.

Savatenalinton, S. & Martens, K. 2010. On the subfamily Cypricerinae McKenzie, 1971 (Crustacea, Ostracoda) from Thailand, with the description of six new species. Zootaxa, 2379, 1-77.

Smith, R. J., Janz, H. & Okubo, I. 2011. Recent Cyprididae and Ilyocyprididae (Crustacea: Ostracoda) from Lake Biwa, Japan, including a summary of the lake's ostracod fauna. Zootaxa, 2874, 1-37.

Smith, R. J. & Matzke-Karasz, R. 2008. The organ on the first segment of the cypridoidean (Ostracoda, Crustacea) antennule: morphology and phylogenetic significance. Senckenbergiana lethaea, 88, 127-140.

Tressler, W.L. 1937. Ostracoda: Mitteilung von der Wallacea-Expedition Woltereck 1931-32. Internationale Revue der gesamten Hydrobiologie und Hydrographie, 34, 188-207.

Victor, R. & Fernando, C.H. 1981. Freshwater ostracods (Crustacea: Ostracoda) of the genus Strandesia Vavra, 1895 from Malaysia, Indonesia and the Philippines. Archiv für Hydrobiologie, Supplementband, 58, 469-522.

Yu, N., Zhao, Q., Li, E., Chen, S. & Chen, L. 2009. An updated and annotated checklist of recent nonmarine ostracods from China. Zootaxa, 2067, 29-50.

Zhai, D. & Zhao, W. 2014. On some recent non-marine ostracods from northern China, with description of one new species. Crustaceana, 87, 985-1026.


Key characters Bradleycypris vittata
Carapace - ventral valve overlapLeft valve overlaps right along ventral margin
Carapace - margin structure - septaNo septa present
Carapace - margin structure - ridges on inner calcified lamellaNo ridges
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)Between 0.4 and 0.7 (medium 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 - attachmentLoop at dorsal end