Friday Fellow: Royal sea star

ResearchBlogging.orgby Piter Kehoma Boll

In order to celebrate the 5oth Friday Fellow, which was posted today, I decided to bring you an extra Friday Fellow! Afterall, there are plenty of interesting lifeforms to be shown.

As I have never presented you any echinoderm, I thought it would be interesting to start the second group of 50 FFs with one of them. So I’ve chosen the royal sea star (Astropecten articulatus).

Beautiful colors, don't you think? Photo by Mark Walz.*

Beautiful colors, don’t you think? Photo by Mark Walz.*

Found in waters from 0 to 200 m deep the West Atlantic coast from New Jersey to Uruguay, the royal sea star may reach around 20 cm in diameter and is easily identified by its color. Dorsally it has a series of dark blue to purple granulose papilae and is lined by orange marginal plates with supermarginal white spines that give it a comb-like appearence, hence the name “Astropecten“, meaning “star-comb”.

As most starfishes, the royal starfish is a predator. It feeds mainly on small and medium-sized mussels and ingests the prey intact, digesting it inside its mouth. As it is unable to digest food extraorally (outside its mouth) it cannot feed on anything that cannot be ingested whole.

Most of its activity occurs at dawn and dusk, which may be inversely related to the activity of predatory fish, as those are usually more active during the day.

Being a considerably common starfish, you may easily find one while walking on the beach, provided that the beach is at the right place.

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References:

Beddingfield, S., & McClintock, J. (1993). Feeding behavior of the sea star Astropecten articulatus (Echinodermata: Asteroidea): an evaluation of energy-efficient foraging in a soft-bottom predator Marine Biology, 115 (4), 669-676 DOI: 10.1007/BF00349375

Wikipedia. Astropecten articulatus. Availabe at: <https://en.wikipedia.org/wiki/Astropecten_articulatus >. Access on July 28, 2016.

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*Creative Commons License
This work is licensed under a Creative Commons Attribution 2.0 Generic License.

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Filed under Conservation, Echinoderms, Friday Fellow, Zoology

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