OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Dolerocypria Tressler, 1937

Superfamily: Cypridoidea Baird, 1845
Family: Candonidae Kaufmann, 1900
Subfamily: Paracypridinae Sars, 1923

One species has been reported from Japan:

1. Dolerocypria mukaishimensis Okubo, 1980

Show synonymy list

1980 Dolerocypria mukaishimensis n. sp. - Okubo: 20-22, Fig. 2, Pl. 1g, h.
1995 Dolerocypria mukaishimensis Okubo - Dia et al.: 619, 621, 622, Fig. 3.
2000 Dolerocypria mukaishimensis Okubo, 1980 - Lee et al: 446, Appendix.
2001 Dolerocypria mukaishimensis Okubo, 1980 - Hiruta & Smith: 124, Fig. 15E, Table 1.
2002 Dolerocypria mukaishimensis Okubo, 1980 - Nakao & Tsukagoshi: 71, 73, Fig. 2E-G, 3, 4, Tables 2-5.
2003 Dolerocypria mukaishimensis Okubo, 1980 - Smith & Kamiya: 81-83, Fig. 2A-C.
2006 Dolerocypria mukaishimensis Okubo, 1980 - Smith & Kamiya: 332, 353, Appendix.
2012 Dolerocypria mukaishimensis Okubo, 1980 - Karanovic & Lee: 8, 41-45, Figs 20, 21.
2012 Dolerocypria mukaishimensis Okubo, 1980 - Chang et al.: 16, Table 1.

Status: full synonymy list

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Left side view of a male Dolerocypria mukaishimensis, length about 0.65 mm.



External view of a left valve of a male of Dolerocypria mukaishimensis, length 665 microns.



External view of a right valve of a male of Dolerocypria mukaishimensis, length 649 microns.



The male sexual organ of Dolerocypria mukaishimensis, length 148 microns.


Additional figures in: Okubo 1980 (carapace and appendages), Nakao & Tsukagoshi 2002 (carapace and appendages), Smith & Kamiya 2003 (carapace), Karanovic & Lee 2012 (carapace and appendages).
Habitat: Typically a brackish water species, but occasionally found in freshwater habitats along coasts (e.g. freshwater rock pools above the foreshore).
Mode of life: Nektobenthic (swimmer).
Reproductive mode: Sexual.
Known distribution: Seto Inland Sea (Okubo 1980), Eastern Hokkaido (Hiruta & Smith 2001), Chiba Prefecture (Nakao & Tsukagoshi 2002), Okayama Prefecture (Smith & Kamiya 2003), Yakushima Island, Kagoshima Prefecture (Smith & Kamiya 2006). Elsewhere, reported from Korea (Lee et al. 2000; Chang et al. 2012; Karanovic & Lee 2012) and China (Dai et al. 1995).

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.

Dia, Z., Ren, C., Zhao, Q., Wang, P. & Yang, F. 1995. Quantitative micro-PIXE and micro-probe analysis of ostracode shells to reconstruct the paleoenvironment. Nuclear Instruments and Methods in Physics Research B, 104, 619-624.

Hiruta, S. & Smith, R. J. 2001. Living Freshwater and Shallow marine Ostracoda in Eastern Hokkaido, Japan (Field excursion E): 107-125. In: Guidebook of Excursions of the 14th International Symposium on Ostracoda (ed. Ikeya, N.). Shizuoka, Japan, 147 pp.

Karanovic, I. & Lee, W. 2012. A review of candonid ostracods (Crustacea: Ostracoda: Podocopida) from East Asia, with descriptions of five new species from South Korea. Zootaxa, 3368, 7-49.

Lee, E., Huh, M. & Schornikov, E. I. 2000. Ostracod fauna from the East Sea coast of Korea and their distribution - preliminary study on Ostracoda as an indicator of water pollution. Journal of the Geological Society of Korea, 36, 435-472. [In Korean with English abstract.]

Nakao, Y. & Tsukagoshi, T. 2002. Brackish-water Ostracoda (Crustacea) from the Obitsu River Estuary, Central Japan. Species Diversity, 7, 67-115.

Okubo, I. 1980. Three new species of the family Candonidae (Ostracoda) from the Inland Sea of Japan. Proceedings of the Japanese Society of Systematic Zoology, 18, 18-27.

Smith, R. J. & Kamiya, T. 2003. Three brackish water ostracods (Crustacea) from Okayama Prefecture, Japan. Species Diversity, 8, 79-91.

Smith, R. J. & Kamiya, T. 2006. Six new species of fresh and brackish water ostracods (Crustacea) from Yakushima, Southern Japan. Hydrobiologia, 559, 331 - 355.


Key characters Dolerocypria mukaishimensis
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 smooth
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 Limb Cleaning limb, with three setae at end
Seventh Limb - segmentsFour segments
Seventh Limb - first segmentThree setae
Caudal ramusElongate ramus with two claws and three setae
Caudal ramus - attachmentWith no loops