Pourtalesia tanneri
| Pourtalesia tanneri | ||||||||||||
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| Scientific name | ||||||||||||
| Pourtalesia tanneri | ||||||||||||
| A. Agassiz , 1898 |
Pourtalesia tanneri is a small species of the irregular sea urchin in the family Pourtalesiidae. It belongs to the benthos of the soft sediments in the deep sea and occurs in the Eastern Pacific , from the Gulf of California to the Galapagos Islands to Chile . It lives at a depth of 1450 to 2389 m.
Description and ecology
As with all Pourtalesiiden, Pourtalesia laguncula is an irregular representative of the sea urchin, i. H. the animals give up their pentaradiary symmetry during ontogeny and develop a bilateral symmetry secondarily . The animals exceed a length of 20 mm and thus remain smaller than the other known species of the genus Pourtalesia . As with other representatives of the Holasteroida, these irregular sea urchins lack Aristotle's lantern . The animals feed on the sea snow that sediments down from higher water layers. The animals take up the sediment soil and filter the nutrients available in low concentrations from it.
Individual evidence
- ↑ Schultz, Heinke AG: Handbook of Zoology. Echinoidea: with bilateral symmetry. Irregularia. Walter de Gruyter GmbH & Co KG, Berlin 2017, ISBN 3-11-036853-6 , p. 133 .
- ^ WoRMS - World Register of Marine Species - Pourtalesia tanneri A. Agassiz, 1898. Retrieved May 1, 2019 .