Echinoderms are a highly diverse group and one of the most conspicuous in deep sea, playing ecological key roles. We present review about history expeditions studies on deep-sea echinoderms Costa Rica, including an updated list species. used literature information gathered from databases California Academy Sciences, Benthic Invertebrate Collection Scripps Institution Oceanography, National Muse...

Timing of fission in the fissiparous starfish Allostichaster capensis under laboratory conditions is described. A. capensis generally splits across the disc along the fission plane during the spring, and then each half regenerates the missing arms during the rest of the year. The fission process can last eight hours. The healing process starts immediately after fission. A. capensis has impressi...

Feeding preferences of the crown-of-thorns sea star, Acanthaster planci (L.), were studied in a series of laboratory-based feeding trials wherein sea stars were provided with equal availability of six different coral species. The order in which corals were consumed was then used to ascertain feeding preferences. Crown-of-thorns sea stars exhibited strong and consistent feeding preferences acros...