Ecology and Functional Morphology of the Isocrinid Cenocrinus Asterius (Linnaeus) (Echinodermata: Crinoidea): in Situ and Laboratory Experiments and Observations
Abstract:In situ observations of the isocrinid, Cenocrinus asterius (Linnaeus), were complemented with observations of these animals in a laboratory flow tank. Both in situ and laboratory manipulations indicate that the process of erecting the stalk from a recumbent to a vertical posture is difficult and may require a considerable amount of time (> 24 h). Manipulation of the cirri may be used by the isocrinid in accomplishing this task. C. asterius was observed to crawl along the bottom of the flow tank and to climb objects placed within the tank, usually using the object as a perch for establishing a feeding posture. A sequence of responses to a change in current direction was recorded in situ, as was the interaction of C. asterius with the deep-body boarfish, Antigonia capros.
This study demonstrates that isocrinids are robust enough to be studied under laboratory conditions, an approach which should greatly aid our understanding of these animals.
Document Type: Research Article
Publication date: May 1, 1991
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