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

One species has been reported from Japan:

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

Show synonymy list

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: Rice fields and ponds.
Mode of life: Nektobenthic (swimmer).
Reproductive mode: Asexual.
Known distribution: Okayama Prefecture (Okubo 1972 as Strandesia camaguinensis), Gunma Prefecture (Okubo & Ida 1989, as Tanycypris pellucida). Elsewhere, Korea (Smith et al. 2014), and Germany, where it is considered to be an alien species (Nagler et al. 2014).

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.

Key characters Tanycypris alfonsi
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 about as wide as posterior one
Carapace - ornamentation - denticlesNo denticles near ventral margin
Carapace - ornamentation - sulcusNo sulcus
Carapace - ornamentation - surfaceSurface smooth with recticulation posteriorly
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 - attachmentLoop at dorsal end