Linckia columbiae

Linckia columbiae is a species of starfish in the family Ophidiasteridae. It is found in the East Pacific where it ranges from California (USA) to northwest Peru, including offshore islands such as the Galápagos.[2] Common names include fragile star, Pacific comet sea star and variable sea star.

Linckia columbiae
Scientific classification
Kingdom:
Animalia
Phylum:
Echinodermata
Class:
Asteroidea
Order:
Valvatida
Family:
Ophidiasteridae
Genus:
Linckia
Species:
L. columbiae
Binomial name
Linckia columbiae
Gray, 1840 [1]
Synonyms[1]
  • Linckia diplax Perrier, 1875
  • Ophidiaster colombiae Müller & Troschel, 1842
  • Phataria fascialis Monks, 1904

Description

Linckia columbiae can grow to 10 cm (4 in) across and varies greatly in colour and shape and even the number of rays. Writing in 1904, Monks stated,

"In over 400 specimens examined not more than four were symmetrical, and no two were alike ... The normal number of rays is five, but some specimens have only one, while others have four, six, seven or even nine."[3]

The disc is small with one or two madreporites, usually oval and variable in size. The long cylindrical rays have blunt, triangular points that turn up slightly at the tip. The surface is covered in hemispherical granules which are larger near the ambulacral grooves. There are two rows of ambulacral plates which distinguishes this species from the very similar Linckia guildingi which has three rows. The colour is generally mottled grey and red and there are a number of rows of tiny yellow stars running longitudinally down each ray.[4]

Distribution and habitat

Linckia columbiae is found in the East Pacific where it ranges from San Pedro, California (USA) and the Gulf of California (Mexico) to northwest Peru.[2] It is also found at offshore East Pacific islands such as the Galápagos, Clarion Island and Cocos Island.[2] It is found on rocks in the intertidal zone at depths down to about 150 m (500 ft).[5]

Biology

This species often undergoes autotomy, a process where one or more rays becomes detached. The animal remains stationary while the ray, using its tube feet for purchase, pulls and twists itself away from the disc until the tissue connecting the two breaks. The separated ray is known as a "comet" and a new disc and a number of new rays start to grow on the damaged surface, a process that takes about six months to complete.[3]

gollark: >hold
gollark: >hold
gollark: >daily
gollark: 2
gollark: >dial *233

References
  1. Linckia columbiae - Gray, 1840 World Register of Marine Species. Retrieved 2011-10-02.
  2. James, M.J., eds. (1991). Galápagos Marine Invertebrates: Taxonomy, Biogeography, and Evolution in Darwin's Islands. pp. 349. Topics in Geobiology. ISBN 978-1-4899-0646-5
  3. Ricketts, Edward Flanders; Jack Calvin; Joel Walker Hedgpeth. Between Pacific Tides: Fifth Edition. Google Books. pp. 96–7. Retrieved 2011-10-02.
  4. ESTUDIO MORFOLÓGICO, TAXONÓMICO, ECOLÓGICO Y DISTRIBUCIÓN GEOGRÁFICA DE LOS ASTEROIDEOS COLECTADOS DURANTE LAS CAMPAÑAS OCEANOGRÁFICAS CORTÉS 1, 2, 3 Retrieved 2011-10-02.
  5. Linckia columbiae Charles Darwin Foundation: Galapagos Species Checklist. Retrieved 2011-10-02.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.