OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Paracypria Sars, 1910

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

Two species have been reported from Japan:

1. Paracypria adnata Smith & Kamiya, 2006

Show synonymy list

2006 Paracypria adnata n. sp. - Smith & Kamiya: 349-353, Figs. 3h-k, 14 & 15, Appendix.
2011 Paracypria adnata Smith & Kamiya, 2006 - Martens & Savatenalinton: 60.
2012 P. adnata Smith & Kamiya, 2006 - Karanovic & Lee: 49.

Status: full synonymy list

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Left side view of a Paracypria adnata, length about 0.6 mm.



External view of a left valve of a female of Paracypria adnata, length 573 microns.



External view of a right valve of a female of Paracypria adnata, length 560 microns.



The male sexual organ of Paracypria adnata, length 79 microns.


Additional figures in: Smith & Kamiya 2006 (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: Yakushima Island, Kagoshima Prefecture (Smith & Kamiya 2006).

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

1. Paracypria inujimensis (Okubo, 1980)


Left side view of a Paracypria inujimensis, length about 0.8 mm. The coloration of this species is quite variable, often with dark grey to black patches, sometimes completely black. This ethanol preserved specimen is somewhat faded.



External view of a left valve of a male of Paracypria inujimensis, length 779 microns.



External view of a right valve of a male of Paracypria inujimensis, length 773 microns.



The surface of the carapace is covered with longitudinal, fine, slightly wavy striations. Width of field of view 389 microns.



The male sexual organ of Paracypria inujimensis, length 150 microns.


Figures in: Okubo 1980 (carapace and appendages), Wouters 1999 (antennule), Smith & Kamiya 2003 (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), Okayama Prefecture (Smith & Kamiya 2003), Yakushima Island, Kagoshima Prefecture (Smith & Kamiya 2006).

References:
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.

Wouters, K. 1999. Two new species of the genus Phlyctenophora Brady, 1880 (Crustacea, Ostracoda) from the Indo-Pacific realm. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie, 69, 83-92.


Key characters Paracypria adnata Paracypria inujimensis
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 smoothSurface striated
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