Genus Notodromas Lilljeborg, 1853
Superfamily: Cypridoidea Baird, 1845
Family: Notodromadidae Kaufmann, 1900
Subfamily: Notodromadinae Kaufmann, 1900
One species has been reported from Japan:
1. Notodromas trulla Smith & Kamiya, 2014 
Left side view of a male Notodromas trulla, length 0.9 mm.
Left side view of a female Notodromas trulla, length 0.8 mm.
External view of a male left valve of Notodromas trulla, length 897 microns.
External view of a female left valve of Notodromas trulla, length 808 microns.
The male sexual organ of Notodromas trulla, length 288 microns.
- Additional figures in: Smith & Kamiya 2014; Okubo & Ida (as Notodromas monacha); Okubo 2003 (as N. monacha); Okubo 2004 (N. monacha).
- Habitat: Irrigation ponds, ponds and paddy fields.
- Mode of life: Nektobenthic/ neustonic (is active at the water surface).
- Reproductive mode: Sexual. Males common.
- Known distribution: Gunma Prefecture (Okubo & Ida 1989; Okubo 2003); Kagawa Prefecture (Okubo 2003); Nagano Prefecture (Brehm 1933); Niigata Prefecture (Brehm 1933); Okayama Prefecture (Okubo 2003); Ishikawa Prefecture (Smith & Kamiya 2014); Aomori Prefecture (Smith & Kamiya 2014).
- Notes: For many decades, Japanese specimens had been misidentified as the more common and widespread Notodromas monacha. However, detailed comparisons between the Japanese specimens and specimens of N. monacha from Europe revealed that they are not the same (Smith & Kamiya 2014). This species is currently only known from Japan.
- References:
- ⚬ Brehm, V. 1933. Einige japanische Ostracoden. Transactions of the Natural History Society of Formosa, 23, 297-298.
- ⚬ Okubo, I. 2003. The freshwater ostracod Notodromas monacha (O. F. Müller, 1776). Bulletin of the Biogeographical Society of Japan, 58, 43-48. [In Japanese].
- ⚬ 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. & Kamiya, T. 2014. The freshwater ostracod (Crustacea) genus Notodromas Lilljeborg, 1853 (Notodromadidae) from Japan; taxonomy, ecology and lifestyle. Zootaxa, 3841, 239-256.