Pseudocentrotus depressus
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| Pseudocentrotus depressus | |
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Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Order: | Camarodonta |
| Family: | Strongylocentrotidae |
| Genus: | Pseudocentrotus |
| Species: | P. depressus |
| Binomial name | |
| Pseudocentrotus depressus (A. Agassiz, 1864)[1] | |
| Synonyms[1] | |
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Pseudocentrotus depressus, commonly known as the pink sea urchin,[2] is a species of sea urchin, one of only two species in the genus Pseudocentrotus. It was first described in 1864 by the American marine zoologist Alexander Agassiz as Toxocidaris depressus, having been collected during the North Pacific Exploring and Surveying Expedition undertaken by Captain Cadwalader Ringgold and later Captain John Rodgers.[1]
This sea urchin is distinctive in its shape, with the oral (lower) surface being flat and the aboral (upper) surface markedly depressed in the centre. The tubercles are numerous and even in size, and the spines are fine and short, their diameter being about a quarter of their length. The inter-ambulacral plates are broad and the pore pairs are arranged in slightly curved groups of six or seven pairs.[3]