ⓘ Tetrapygus

                                     

ⓘ Tetrapygus

Tetrapygus is a genus of sea urchins in the family Arbaciidae. It is a monotypic genus and the only species is Tetrapygus niger which was first described by the Chilean naturalist Juan Ignacio Molina in 1782. It is found in the southeastern Pacific Ocean on the coasts of South America.

                                     
  • Podocidaris Agassiz, 1869 Pygmaeocidaris Doderlein, 1905 Sexpyga Shigei, 1975 Tetrapygus Agassiz, 1841b Barnes, Robert D. 1982 Invertebrate Zoology. Philadelphia
  • algae. Echinoids occurring in this zone include Loxechinus albus and Tetrapygus niger, and starfish include Stichaster striatus, Meyenaster gelatinosus
  • Its diet includes brittle stars such as Ophiactis, sea urchins such as Tetrapygus niger and starfish such as Patiria. In the subtidal zone of temperate
  • be a wide diversity of molluscs and crustaceans, with the sea urchin Tetrapygus niger and the gastropod Tegula tridentata being dominant. The most common
  • 1778 Needle urchin Echinothrix calamaris Pallas, 1774 Banded urchin Tetrapygus niger Molina, 1782 Black urchin Echinus gilchristi Bell, 1904 Deep water