Best Spatangoid
The purple heart urchin, Spatangus purpureus, is an irregular sea urchin in the family Spatangidae. It lives buried in coarse sand or gravel in the eastern Atlantic, the English Channel, and the Mediterranean, with a range extending from northern waters south to Senegal and a recorded depth range fr...
Abatus nimrodi is an Antarctic heart urchin in the family Schizasteridae and the order Spatangoida. It is an irregular sea urchin of the Southern Ocean and belongs to the genus Abatus, whose species are known for brooding their young in specialized pouches on the upper body. The species is associate...
Protenaster australis is a living irregular sea urchin in the order Spatangoida and family Schizasteridae, commonly described as a heart urchin. It is associated with southern Australia and lives buried in shallow sandy seabeds rather than being known only from fossils. Western Australian Museum spe...
Palaeopneustes cristatus is a species of deep-sea irregular sea urchin in the family Paleopneustidae. It is characterized by its heavily calcified, robust test, which is an evolutionary adaptation to the high-pressure environments of the ocean floor. As a spatangoid or heart urchin, it possesses a s...
Nacospatangus altus is an extinct species of heart urchin belonging to the family Maretiidae, known primarily from fossil deposits dating to the Eocene epoch.
