at the Lake Biwa Museum, Japan
Robin James Smith
Genus Candona Baird, 1845
Superfamily: Cypridoidea Baird, 1845
Family: Candonidae Kaufmann, 1900
Subfamily: Candoninae Kaufmann, 1900
One species has been reported from Japan:
1. Candona candida (O.F. Müller, 1776)Show synonymy list
1845 Candona candida - Baird: 153 (new comb.).
Status: abbreviated synonymy list.
Left side view of a female Candona candida, length about 1 mm. This is one of the first species of ostracod to be described using the binomial classification system,
External view of a female left valve of Candona candida, length 1007 microns.
External view of a female right valve of Candona candida, length 980 microns.
Habitat: In Japan reported from ponds, a creek, and shallow streams (Smith & Kamiya 2015). Elsewhere, reported from a wide range of habitats, including lakes, ponds, ditches, swamps, rivers, wells and subterranean waters (see Meisch 2000 for a review).
Mode of life: Benthic.
Reproductive mode: Only females reported from Japan. Males occur in small numbers elsewhere.
Known distribution: Eastern Hokkaido (Smith & Kamiya 2015). General distribution, Holarctic, but less abundant in the south (Meisch 2000).
Baird W. 1845. Arrangement of the British Entomostraca, with a list of species, particularly noticing those which have as yet been discovered within the bounds of the club. Transactions of the Berwickshire Naturalists' Club, 2, 145-416.
Meisch, C. 2000. Freshwater Ostracoda of Western and Central Europe. In: Schwoerbel, J., Zwick, P., (Eds.), Süßwasserfauna von Mitteleuropa 8/3. Spektrum Akademischer Verlag, Heidelberg, Berlin 522 pp.
Müller O. F. 1776. Zoologiae Danicae Prodromus, seu Animalium Daniae et Norvegiae Indigenarum characters, nomina, et synonyma imprimis popularium. Havniae. XXXII:1-282.
Smith, R. J. & Kamiya, T. 2015. Four new species of the subfamily Candoninae (Crustacea, Ostracoda) from freshwater habitats in Japan. European Journal of Taxonomy, 136, 1-34.
|Key characters||Candona candida|
|Carapace - ventral valve overlap||Left valve overlaps right along ventral margin|
|Carapace - margin structure - septa||No septa present|
|Carapace - margin structure - ridges on inner calcified lamella||No ridges|
|Carapace - dorsal view - female with brood pouch||Brood pouch not visible|
|Carapace - lateral view - ventral margin||Ventral margin approximately straight to concave|
|Carapace - lateral view - valve height||Left and right valves similar height|
|Carapace - internal view||Anterior calcified inner lamella wider than posterior one|
|Carapace - ornamentation - denticles||No denticles near ventral margin|
|Carapace - ornamentation - sulcus||No sulcus|
|Carapace - ornamentation - surface||Surface smooth|
|Carapace - width/length ratio (w/l)||Between 0.4 and 0.7 (medium species)|
|Antennule - segments||Seven moveable segments|
|Antennule - Rome organ||No Rome organ|
|Antenna - exopodite||Exopodite reduced to small segment|
|Antenna - swimming setae||No swimming setae present|
|Fifth limb - morphology||Maxilliped|
|Sixth limb - segments||Five segments|
|Sixth limb - setae on first segment||One seta|
|Sixth limb - h3 seta on final segment||H3 seta short; much shorter than half length of claw|
|Seventh Limb||Cleaning limb, with three setae at end|
|Seventh Limb - segments||Four segments|
|Seventh Limb - first segment||Two setae|
|Caudal ramus||Elongate ramus with two claws and two setae|
|Caudal ramus - attachment||With no loops|