Pteraster trigonodum

Taxonomy

Domain: Eukaryota () - Whittaker & Margulis,1978
- Kingdom: Animalia () - Linnaeus, 1758 - animals
  - Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
    - Branch: Deuterostomia () - Grobben, 1908
      - Infrakingdom: Coelomopora () - (Marcus, 1958) Cavalier-Smith, 1998
        Phylum: Echinodermata () - Klein, 1734 Ex De Brugi�re, 1789 - Echinoderms
        Subphylum: Eleutherozoa () - Bell, 1891
        Infraphylum: Asterozoa () - Von Zittel, 1895
        Class: Stelleroidea ()
        Subclass: Asteroidea ()
        Order: Spinulosida ()
        Family: Pterasteridae ()
        Genus: Pteraster () - - cushion star
        Specific name: trigonodum
        Scientific name: - Pteraster trigonodum Fisher, 1910

There are approximately 25 species in this genus:

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Brands, S.J. (comp.) 1989-2006. Systema Naturae 2000. The Taxonomicon. Universal Taxonomic Services, Amsterdam, The Netherlands. Accessed October 11, 2006.
MBLWHOI Library: Universal Biological Index and Organizer. uBio.org accessed July 21, 2008.