Janolus fuscus
| Janolus fuscus | |
|---|---|
 |
|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): |
clade Heterobranchia clade Euthyneura |
| Family: | Proctonotidae |
| Genus: | Janolus |
| Species: | J. fuscus |
| Binomial name | |
|
Janolus fuscus |
|
clade Euthyneura
clade Nudipleura
clade Nudibranchia
clade Dexiarchia
clade Cladobranchia
Janolus fuscus is a species of sea slug, or more accurately a nudibranch, a marine gastropod mollusk in the family Proctonotidae.
The species Janolus fuscus is found from the Kenai Peninsula, Alaska to central California and also in northern Japan.
This species of nudibranch is found in shallow and subtidal waters.
The bodies of nudibranchs in this species are semi-translucent. The body is covered in short cerata. In Janolus fuscus the cerata are orange and white tipped.
Janolus species feed on Bryozoa.
In California, Navanax is a known predator of Janolus. Navanax tracks the slime of Janolus by using chemoreceptors. When Janolus is about to be caught, it rolls into a ball, leaving its cerata exposed. If there is a water current, as if often the case, the sea slug may then be passively rolled away from the predator.
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Wikipedia