Asteronychidae
Asteronychidae is a family of echinoderms belonging to the order Euryalida. Genera: * ''Asteronyx'' Müller & Troschel, 1842 * ''Astrodia'' Verrill, 1899 * ''Astronebris'' Downey, 1967 * ''Lillithaster'' Thuy, Numberger-Thuy & Jagt, 2018 * ''Ophioschiza'' H.L.Clark, 1911 References

Echinoderm families Phrynophiurida {{Ophiuroidea-stub ...
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Euryalida
The Euryalida are an order of brittle stars, which includes large species with either branching arms (called "basket stars") or long and curling arms (called "snake stars"). Characteristics Many of the species in this order have characteristic repeatedly branched arms (a shape known as "basket stars", which includes most Gorgonocephalidae and two species in the family Euryalidae), while the other species have very long and curling arms, and go rather by the name of "snake stars" (mostly abyssal species). Many of them live in deep sea habitats or cold waters, though some basket stars can be seen at night in shallow tropical reefs. Most young basket stars live on specific type of coral. In the wild they may live up to 35 years. They weigh up to Like other echinoderms, basket stars lack blood and achieve gas exchange via their water vascular system. The basket stars are the largest ophiuroids with '' Gorgonocephalus stimpsoni'' measuring up to 70 cm in arm length wit ...
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