Evadne nordmanni
Lovén (1836)
Download a fact sheet for Evadne nordmanni (PDF 288KB)
Taxonomy
| Phylum | Arthropoda |
| Subphylum | Crustacea |
| Class | Branchiopoda |
| Subclass | Phyllopoda |
| Order | Diplostraca |
| Suborder | Cladocera |
| Family | Podonidae |
| Genus | Evadne |
| Species | nordmanni |
Size
- Female: 0.4 - 1.4 mm
- Male: 0.4 - 0.8 mm
Distinguishing characteristics
- Carapace always pointed at posterior end
- 2 antennal elevator muscles lying parallel to each other
Male
- Carapace triangular in lateral view, separated from head with adorsal depression
- Compared to female, head and eyes are larger and lower edge is curved more sharply
- Distal segment of endopodite of leg 1 has strong, inwardly curved hook
- Copulatory organ is cylindrical, distally with longitudinal grooves
Female
- In lateral view oval or triangular (depends on devision stage of embryos)
- Brood pouch narrowing posteriorly, pointed or more or less rounded with short spine
- Head small compared to body, anteriorly rounded regularly, faintly convex near antennulae@
- Compound eye large, but by far not occupying the forehead
- Antennulae very small, fused at base; pointed in lateral view, rounded distally, bearing 3-4
- Legs rather short, first leg not elongated
- Postabdomen very short and bifurcated
- Up to 7-8 embryos in the brood pouch
Distribution
Ecology
References
- Flößner, D., (1972) Kiemen- und Blattfüßer, Branchiopoda; Fischläuse, Branchiura. Die Tierwelt Deutschlands, 60. Teil. Gustav Fischer Verlag, Jena.