Culcita (echinoderm)


Culcita is a genus of cushion stars. They are found in tropical waters. Some are kept in home aquariums.

Description and characteristics

These are very particular stars, plump and pillow-shaped, more or less pentagonal. Their five arms have waned to only obtuse angles. They can measure up to 30 cm in diameter, and are typical of Indo-Pacific coral reefs, where they feed on benthic invertebrates and coral.
Two species Culcita novaeguineae and Culcita schmideliana are extremely similar and almost impossible to differentiate by sight, except that C. schmideliana has larger tubercles, that are normally absent from papular areas. They are thus distinguished mostly by their area of distribution: C. schmideliana lives in the Indian Ocean, and C. novaeguineae in Oceania and the Pacific Ocean. The third species, C. coriacea, lives in the Red Sea and around Arabia, and is slightly different in appearance.
This genus is not to be confused with similar cushion-shaped species such as Halityle regularis.
The juveniles are flat and pentagonal, and can look like "biscuit sea stars" from the family Goniasteridae.

List of species

The genus contains three species: