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

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).

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.


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