OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Bradleytriebella Savatenalinton & Martens, 2009

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

Two species have been reported from Japan:

1. Bradleytriebella lineata (Victor & Fernando, 1981)

Show synonymy list

1981 Strandesia lineata n. sp. - Victor & Fernando: 487-489, figs 91-109.
1984 Paracypretta amati sp. n. - Martens: 154-159, figs 54-61, 90-110. (Synonymy in Savatenalinton & Martens 2009a)
2004 Strandesia biwaensis sp. nov. - Okubo: 36, figs 18c, d, & j, nomen nudum. (Synonymy in Smith et al., 2011)
? 2005 Zonocypris sp. - Yu et al.: 147, plate II, fig. 16. (Synonymy in Smith et al., 2011)
2008 Strandesia biwaensis Okubo, 2004 nomen nudum - Smith & Matzke-Karasz: table 1, plate 2, figs 1 & 2.
2009b Strandesia biwaensis Okubo, 2004 - Savatenalinton & Martens: 37.
2009b Bradleystrandesia lineata (Victor & Fernando, 1981) - Savatenalinton & Martens: 1, 36, new combination.
2009b Strandesia amati (Martens, 1984) - Savatenalinton & Martens: 36, new combination.
2009a Bradleytriebella lineata (Victor & Fernando, 1981) - Savatenalinton & Martens: 13, 33, 46, new combination.
2010 Bradleytriebella lineata (Victor & Fernando, 1981) - Savatenalinton & Martens: 70-73, fig. 46.
2011 Bradleytriebella lineata (Victor & Fernando, 1981) - Martens & Savatenalinton: 18.
2011 Bradleytriebella lineata (Victor & Fernando, 1981) - Smith et al.: 4-8, Figs 2A-E, 3 & 4.
2012 B. lineata (Victor and Fernando 1981c) - Karanovic: 377, 378.
Status: full synonymy list.

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Dorsal view of a female Bradleytriebella lineata, anterior to the right. Length about 0.6 mm.


External view of a female left valve of Bradleytriebella lineata, length 619 microns. The surface of the valves are covered in striations, reminiscent of a fingerprint.


External view of a female right valve of Bradleytriebella lineata, length 601 microns.
Additional figures in: Victor & Fernando 1981 (carapace and appendages); Okubo 2004 (as Strandesia biwaensis sp. nov.) (carapace); Savatenalinton & Martens 2010 (carapace); Smith et al. 2011 (carapace and appendages).
Habitat: Shallow areas of Lake Biwa, especially on sandy substrates near water plants. Outside of Japan known from reservoirs, rice fields, canals, swamps, springs, ponds and ditches.
Mode of life: Nektobenthic (swimmer).
Reproductive mode: Asexual, males unknown.
Known distribution: Lake Biwa, Shiga Prefecture (Okubo 2004; Smith et al. 2011). Elsewhere, Philippines (Victor & Fernando 1981 as Strandesia lineata), Sudan (Martens 1984, as Paracypretta amati) and Thailand (Savatenalinton and Martens 2010).

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

Martens, K. 1984. On the freshwater ostracods (Crustacea, Ostracoda) of the Sudan, with special reference to the Red Sea Hills, including a description of a new species. Hydrobiologia, 110, 137-161.

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

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

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 Cypricercinae McKenzie, 1971 (Crustacea, Ostracoda) from Thailand, with the description of six new species. Zootaxa, 2379, 1-77.

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.

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.

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., Schornikov, E. I., & Chen, L. 2005. Recent Ostracods from the Taihu Lake. Acta Micropalaeontologica Sinica, 22, 143-151. [Chinese with English abstract].


2. Bradleytriebella tuberculata (Hartmann, 1964)

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1964 Strandesia tuberculata n. sp. - Hartmann: 118-121, figs 50 & 51.
1972 Strandesia tuberculata Hartmann 1964 - Bhatia et al.: 52.
1979 Strandesia tuberculata Hartmann, 1964 - Victor & Fernando: 155, 158, 233.
1990b Strandesia decorata (Sars, 1903) - Okubo: 46, figs 3f-k. (Synonymy in Smith et al. 2014)
1990b Strandesia tuberculata (Hartmann, 1964) - Okubo: 48, Fig. 3l.
2004 Strandesia decorata (Sars, 1903) - Okubo: 36, figs 18g, h, k, o, p. (Synonymy in Smith et al. 2014)
2005 S. tuberculata Hartmann, 1964 - Karanovic: 93.
2009b Bradleystrandesia tuberculata (Hartmann, 1964) - Savatenalinton & Martens: 36, new combination.
2009 B. tuberculata (Hartmann, 1964) - Yu et al.: 32.
2009a Bradleytriebella tuberculata (Hartmann, 1964) - Savatenalinton & Martens: 33-38, figs 27-29, new combination.
2012 B. tuberculata (Hartmann 1964) - Karanovic: 377, 378.
2014 Bradleytriebella tuberculata (Hartmann, 1964) - Smith et al.: 23-24, Fig. 2G-J, Table 1.

Status: full synonymy list.

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Dorsal view of a female Bradleytriebella tuberculata, anterior to the right. Length about 0.7 mm. This species typically has two tubercles (bumps) on the carapace in the areas marked with white triangles, giving an angular appearance in dorsal view. However, in some populations these tubercles are weakly expressed or absent (as with this specimen).


External view of a female left valve of Bradleytriebella tuberculata, length 740 microns. The surface of the valves are covered in striations.


External view of a female right valve of Bradleytriebella tuberculata, length 710 microns.
Figures in: Okubo 1990 (carapace), Okubo 2004 (carapace), Savatenalinton & Martens 2009 (carapace and appendages).
Habitat: Rice fields.
Mode of Life: Nektobenthic (swimmer).
Reproductive Mode: Asexual, males unknown.
Distribution: Okayama Prefecture (Okubo 1990). Elsewhere reported from India (Hartmann 1964), Thailand (Savatenalinton & Martens 2009), Taiwan (Yu et al. 2009) and Korea (Smith et al. 2014).

References:
Bhatia, S. B., Guha, D. K. & McKenzie, K. G. 1972. Checklist of Ostracoda recorded from the Indian subcontinent and Ceylon (1840-1971). In: McKenzie, K. G. (Ed.) "Shallow marine and freshwater Ostracoda of Tethys" IPU Study Group, 59 pp.

Hartmann, G. 1964. Asiatische Ostracoden, systematische und zoogeographische Untersuchungen. Internationale Revue der Gesamten Hydrobiologie, Systematische Beihefte, 3, 1-155.

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, 79-97.

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

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.

Smith, R. J., Lee, J., & Chang, C. Y. 2014. Nonmarine Ostracoda (Crustacea) from Jeju Island, South Korea, including descriptions of two new species. Journal of Natural History, http://dx.doi.org/10.1080/00222933.2014.946110, 1-40.

Victor, R. & Fernando, C. H. 1979. The freshwater ostracods (Crustacea: Ostracoda) of India. Records of the Zoological Survey of India, 74, 147-242.

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.


Key characters Bradleytriebella lineata & Bradleytriebella tuberculata
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 - surface Surface striated
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