OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Tanycypris Triebel, 1959

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

Two species have been reported from Korea:

1. Tanycypris alfonsi Nagler, Geist & Matzke-Karasz, 2014

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1972 Strandesia camaguinensis Tressler, 1937 - Okubo: 9-14, Fig. 1.
1989 Tanycypris pellucida (Klie) - Okubo & Ida: 106, pl. 4E & F.
2004 Tanycypris pellucida (Klie, 1900) - Okubo: 35, figs 18a, b, l-n.
2014 Tanycypris alfonsi n. sp. - Nagler et al.: 407-410, 416, figs 2-4, 11, Table 1.
2014 Tanycypris alfonsi Nagler, Geist & Matzke-Karasz, 2014 - Smith et al.: 24, 26, figs. 8C-F, 9C, tables 1 & 2.
2014 Tanycypris alfonsi Nagler, Geist & Matzke-Karasz, 2014 - Matzke-Karasz et al.: 1073, 1075, 1082, 1090, 1092, figs 1b, 2a-d, f, 5-8, & 14.

Status: full synonymy list

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Left side view of a female Tanycypris alfonsi, length 1.3 mm.


Dorsal view of a female Tanycypris alfonsi, anterior to left, length 1.3 mm.


External view of a female left valve of Tanycypris alfonsi, length 1253 microns.


External view of a female right valve of Tanycypris alfonsi, length 1242 microns.

Additional figures in: Okubo 1972 (as Strandesia camaguinensis) (carapace and caudal ramus), Okubo & Ida 1989 (as Tanycypris pellucida) (carapace), Okubo 2004 (as Tanycypris pellucida) (carapace and caudal ramus), Nagler et al. 2014 (carapace and appendages), Smith et al. 2014 (carapace).
Habitat: Irrigation ponds (Smith et al. 2014). Elsewhere, rice fields, shallow ponds (Okubo 1972), and artificial containers in greenhouses (Nagler et al. 2014).
Mode of life: Nektobenthic (swimmer).
Reproductive mode: Asexual.
Known distribution: Jeju Island (Smith et al. 2014). Elsewhere, known from Japan (Okubo 1972; Okubo & Ida 1989; Okubo 2004), and Germany, where it is considered to be an alien species (Nagler et al. 2014).
Remarks: See below for T. centa.

References:
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.

Matzke-Karasz, R., Nagler, C. & Hofmann, S. 2014. The ostracod springtail - camera recordings of a previously undescribed high-speed escape jump in the genus Tanycypris (Ostracoda, Cypridoidea). Crustaceana, 87, 1072-1094.

Nagler, C., Geist, J. & Matzke-Karasz, R. 2014. Revision of the genus Tanycypris (Ostracoda, Cypricercinae) with the description of Tanycypris alfonsi n. sp., and an identification key to the genus. Zootaxa, 3821, 401-424.

Okubo, I. 1972. Strandesia camaguinensis Tressler, 1937, from Japan (Ostracoda, Cyprididae). Proceedings of the Japanese Society of Systematic Zoology, 8, 9-14.

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

Okubo, I. & Ida, K. 1989. Freshwater Ostracoda from Gunma Prefecture, Japan (In Japanese). Bulletin of the Biogeographical Society of Japan, 44, 105-107.

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.


2. Tanycypris centa Chang, Lee & Smith, 2014

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2012 Tanycypris centa n. sp. - Chang et al.: 4-8, figs 2D-H, 3 & 4, table 1.
2014 Tanycypris centa (Chang et al., 2012) - Nagler et al.: 410-412, 416, 422, figs 5A, 6D, 6I, 7C, & 11.
2014 Tanycypris centa Chang, Lee and Smith, 2012 - Smith et al.: 26 & 27, tables 1 & 2.
2014 Tanycypris centa Chang, Lee & Smith, 2012 - Matzke-Karasz et al.: 1073, 1075, 1077, 1082, 1092, figs 1a, 3-5, 9-12, Table 1.

Status: full synonymy list

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Left side view of a female Tanycypris centa, length 1.1 mm.


External view of a female left valve of Tanycypris centa, length 1153 microns.


External view of a female right valve of Tanycypris centa, length 1133 microns.

Additional figures in: Chang et al. 2014 (carapace and appendages).
Habitat: Lower reaches of river (Chang et al. 2012), irrigations pond (Smith et al. 2014), and artificial containers in greenhouses (Nagler et al. 2014).
Mode of life: Nektobenthic (swimmer).
Reproductive mode: Asexual.
Known distribution: Hyeongsan River, North Gyeongsang Province (Chang et al. 2012), Jeju Island (Smith et al. 2014). Elsewhere, Germany, where it is considered to be an alien species (Nagler et al. 2014).
Remarks: Both this species and T. alfonsi have been observed jumping from a substrate, using their extremely long and powerful caudal rami. This is probably an escape mechanism from predators (Matzke-Karasz et al. 2014).

References:
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.

Matzke-Karasz, R., Nagler, C. & Hofmann, S. 2014. The ostracod springtail - camera recordings of a previously undescribed high-speed escape jump in the genus Tanycypris (Ostracoda, Cypridoidea). Crustaceana, 87, 1072-1094.

Nagler, C., Geist, J. & Matzke-Karasz, R. 2014. Revision of the genus Tanycypris (Ostracoda, Cypricercinae) with the description of Tanycypris alfonsi n. sp., and an identification key to the genus. Zootaxa, 3821, 401-424.