Ostracod Research at the Lake Biwa Museum, Japan

Robin James Smith

Genus Undulacandona Smith, 2011

Superfamily: Cypridoidea Baird, 1845
Family: Candonidae Kaufmann, 1900
Subfamily: Candoninae Kaufmann, 1900

Two species have been reported from Japan:

1. Undulacandona colymba Smith, 2011

Left side view of a female Undulacandona colymba, length about 0.8 mm.

External view of a male left valve of Undulacandona colymba, length 778 microns.

External view of a male right valve of Undulacandona colymba, length 795 microns.

The male sexual organ of Undulacandona colymba, length 306 microns. (Photograph is inverted to allow for easy comparison with species below.)

Additional figures in: Smith & Kamiya 2015.
Habitat: Groundwater (well).
Mode of life: Subterranean.
Reproduction mode: Sexual.
Known distribution: Currently only known from a well in Nagahama City, Shiga Prefecture (Smith & Kamiya 2015).
References:
⚬ 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.

2. Undulacandona spinula Smith, 2011

Left side view of a male (top) and a female Undulacandona spinula, length about 0.8 mm.

External view of a male left valve of Undulacandona spinula, length 770 microns.

External view of a male right valve of Undulacandona spinula, length 765 microns.

The male sexual organ of Undulacandona spinula, length 253 microns.

Additional figures in: Smith 2011.
Habitat: Groundwater (well).
Mode of life: Subterranean.
Reproduction mode: Sexual.
Known distribution: Currently only known from a well in Otsu City, Shiga Prefecture (Smith 2011).
References:
⚬ Smith, R. J. 2011. Groundwater, spring and interstitial Ostracoda (Crustacea) from Shiga Prefecture, Japan, including descriptions of three new species and one new genus. Zootaxa, 3140, 15-37.