fracture zone. These species, one stalked crinoid and three comatulids, are
well adapted to thrive in extreme depths. The stalked crinoid is known from 3,000
to 4,500 m, while the comatulids occur from 12 to 3,234 m. The hyocrinid species
Hyocrinus foelli Roux and Pawson, 1999, has been reported only near the
Revillagigedo archipelago.
Fig. 2.5 a Davidaster sp., Mexican Caribbean. b Nidorellia armata (Gray, 1840), Gulf of
California. c Heliaster kubiniji Xantus, 1860, Gulf of California. d Amphiaster insignis Verrill,
1868, Gulf of California. e Linckia columbiae Gray, 1840, Gulf of California. f Astropecten
armatus Gray, 1840, Gulf of California. Images a by Valeria Mas, b and e by Carlos SanchezOrtiz, c, d and f by Israel Sanchez
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F. A. Solís-Marín et al.