|Dermasterias imbricata |
The leather star has a broad central disc and five plump, short arms which taper broadly from the central disc. The arms have two rows of tube feet and no bordering marginal plates. The upper surface is smooth and velvety, covered with a reticulated pattern in reddish-brown, often with patches of greyish-blue. No pedicellariae are present, but the madreporite can be seen. This starfish can grow to about 25 cm in diameter and has a distinctive smell that resembles garlic and sulphur.
The leather star feeds on algae and a range of invertebrates, including other asteroids, bryozoans, sea urchins, sponges, sea cucumbers, hydroids, sea pens, and colonial tunicates. It is in turn preyed on by the morning sun star (Solaster dawsoni). In its attempts to evade this voracious predator, it crawls away at a maximum speed of 15 cm/min, but this is too slow, and leather stars make up 50% of the diet of morning sun stars.
The leather star sometimes lives symbiotically with the scaleworm Arctonoe vittata. The worm also associates with various other marine invertebrates, but if separated from its host, will search out another member of the same species. The worm may nip off the heads of small tube-dwelling polychaetes as the starfish moves around, but is not harmed by its host.
- World Register of Marine Species
- Marine Biodiversity of British Columbia Archived 2013-04-15 at Archive.is
- Zipcode Zoo Archived 2012-09-02 at the Wayback Machine.
- "Leather star: Dermasterias imbricata". Sea stars of the Pacific Northwest. 2011. Archived from the original on 2012-09-09. Retrieved 2012-09-22.
- Arctonoe vittata Archived 2012-07-30 at the Wayback Machine.
- Media related to Dermasterias imbricata at Wikimedia Commons