The pourtalesiids (Pourtalesiidae) are a family of irregular sea urchins that live in the deep sea. They are secondarily bilateral-symmetrical and like other representatives of the taxon Holasteroida they lack the lantern of Aristotle, which is typical for many other sea urchins. The genus Pourtalesia was named after Louis-François de Pourtalès who first collected these animals while dredging at a depth of 600 m. The family is known already from the Upper Cretaceous (Maastrichtian) and is distributed worldwide.[1]
The pourtalesiids (Pourtalesiidae) are a family of irregular sea urchins that live in the deep sea. They are secondarily bilateral-symmetrical and like...
which is highly elongated. In some contemporary abyssal groups such as Pourtalesiidae, some species are even bottle-shaped. The mouth (peristome) does not...
"cactus urchins" Dermechinus. One of the deepest-living families is the Pourtalesiidae, strange bottle-shaped irregular sea urchins that live in only the hadal...
the wonderful sea urchin, is a species of sea urchin in the family Pourtalesiidae. It is found at abyssal depths in the Atlantic Ocean. The thin-shelled...
Ceratophysa ceratopyga is a species of sea urchins of the family Pourtalesiidae. Their armour is covered with spines. Ceratophysa ceratopyga was first...
Ceratophysa rosea is a species of sea urchins of the family Pourtalesiidae. Their armour is covered with spines. Ceratophysa rosea was first scientifically...
Pourtalesia is a genus of the family Pourtalesiidae which belongs to the irregular (bilaterally symmetrical) sea urchins. The animals measure 5–6 cm in...
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