Onychopoda
| Onychopoda | |
|---|---|
| |
| Evadne spinifera | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Branchiopoda |
| Superorder: | Diplostraca |
| Order: | Onychopoda Sars, 1865 [1] |
| Families | |
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Cercopagididae Mordukhai-Boltovskoi, 1968 Polyphemidae Baird, 1845
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Onychopoda are a specialised order of
The order Onychopoda is "one of the most morphologically distinctive groups of cladocerans".
Most species of Onychopoda live in the waters of the Ponto-Caspian basin (Caspian Sea, Aral Sea, Black Sea including Sea of Azov), in remnants of the ancient Paratethys ocean.[5] Some other species live in fresh water or in the oceans, where they can be widespread.[5]
There are three families, containing 10 genera and around 33 described species, most of which are endemic to the Ponto-Caspian basin:[2]
- Bythotrephes), 14 species; Black Sea & Caspian Sea
- Podonidae Mordukhai-Boltovskoi, 1968 – 7 genera, 17 species; Pont-Caspian (Caspievadne, Cornigerius and Podonevadne) and marine (Evadne, Pleopis, Podon and Pseudevadne)
- Polyphemidae Baird, 1845 – 1 genus (Polyphemus), 2 species; fresh water
The embryos are protected by a brood pouch, which also secretes nutrients to aid their development. This may be related to the colonisation of the oceans, since the only other marine cladoceran, Penilia avirostris, has a similar pouch as a result of convergent evolution.[2]
See also
References
- . pp. 1–132.
- ^ .
- ISBN 978-81-7141-897-8.
- ISBN 978-0-412-75420-3.
- ^ PMID 11286495.
External links
- Podon sp. fact sheet - Guide to the marine zooplankton of south eastern Australia
- Evadne sp. fact sheet - Guide to the marine zooplankton of south eastern Australia
Families of class Branchiopoda | ||
|---|---|---|
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| Anostraca |  | |
| Notostraca | ||
Laevicaudata | ||
Spinicaudata | ||
Cyclestherida |
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Cladocera |
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| Authority control databases: National |
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