Best Echinothurioida
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1
Echinosigra phiale is a deep-sea echinothurioid sea urchin known from abyssal depths, notable for its flexible test and worldwide distribution.
2
Tromikosoma hispidum is a deep-sea echinothurioid sea urchin with a broad distribution in the world's deep oceans, noted for its bristly surface.
3
Sperosoma giganteum is a large species of deep-sea sea urchin described by German zoologist Ludwig Döderlein in 1901 from Japanese waters.
4
Calveria hystrix is a sea urchin species known from the Atlantic Ocean, characterized by its robust spines and distinctive test morphology.
5
Tromikosoma pallidum is a species of deep-sea pancake urchin belonging to the Echinothuriidae family, recognized by its notably pale coloration.
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