Hermissenda crassicornis
(Eschscholtz, 1831)

Photographed by: Marli Wakeling
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Opisthobranchia |
| Order: | Nudibranchia |
| Suborder: | Aeolidina |
| Family: | Facelinidae |
| Species: | Hermissenda crassicornis |
Comment from Gary McDonald on photo #4599
The orange & light blue lines between the rhinophores are characteristicComment from Gary McDonald on photo #2653
Yes, this is definitely Hermissenda crassicornis. It is distinguished by the double, opalescent blue median line running the length of the body and enclosing a bright orange-yellow elongate spot between and posterior to rhinophores and another in cardiac region; and the weakly perfoliate rhinophores.If you wish to post a photo of the rhinophore, go to Photo #2687
Locality:
- USA
- California (34) Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Oct, Nov
- Oregon (3) Jan, Mar, Jul
- Alaska (1) Jan
- Santa Cruz Island (1) Feb
- La Jolla (1) May
- Catalina Island (1) Jan
- Seal Rock, Oregon (1) Apr
- Canada
- British Columbia (13) Mar, Apr, May, Jun, Nov
- Port Hardy (4) Feb, Dec
- Russia
- Peter the Great Bay (2) Dec