Oithona nana
Giesbrecht (1893)
Download a fact sheet for Oithona nana (PDF 319KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Maxillopoda |
| Subclass | Copepoda |
| Order | Cyclopoida |
| Family | Oithonidae |
| Genus | Oithona |
| Species | nana |
Size
- Female: 0.49-0.59 mm
Distinguishing characteristics
- Cephalosome narrow and truncated anteriorly in dorsal view, bent ventrally with blunt rostrum in lateral view (almost no rostrum)
- Genital somite remarkably swollen laterally in anterior quarter. Anterior margin of swelling nearly semicircular in dorsal view
Male
- Very difficult to identify
Female
- Prosome oval in dorsal view, greatest width at anterior end of pedigerous somite 1
- Cephalosome narrow and truncated anteriorly in dorsal view, bent ventrally with blunt rostrum in lateral view.
- Prosome length 1.9-2.1 times width
- Prosome:Urosome 1.0-1.2
- A1 short, as long as prosome
- Almost no rostrum
- Genital somite remarkably swollen laterally in anterior quarter. Anterior margin of swelling nearly semicircular in dorsal view
- Caudal rami dorsal seta, thin and narrow compared to other setae
- Can confuse with O. attenuata
- Can come in plumose form with plumose setae
Distribution
Ecology
References
- Nishida, S. (1985). "Taxonomy and distribution of the family Oithonidae (Copepoda, Cyclopoida) in the Pacific and Indian oceans." Bulletin of the Ocean Research Institute, University of Tokyo. Tokyo. no. 20: 1-167.