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Free Content Some Preliminary Observations on the Young Forms of the Echinoid, Diadema Antillarum Philippi

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The very young forms of the echinoid Diadema antillarum Philippi have been found regularly in only one locality in Jamaica namely, among coral fragments in the calm shallow water covering the landward aspect of a reef near Port Antonio.

Though their general color by day is the same as that of the adult, the spines are banded, the peristome is white and the sub-ambital region of the test is grey. The pattern of blue lines or spots, which is due to iridophores and melanophores, is variable, depending on light intensity. It has but limited significance as a specific character. The structure and development of the iridophores are described and it is suggested that they may be comparable to the so-called “eyes” of Diadema setosum (Leske).

The animals react to changes in intensity of illumination by movement of spines, tube feet and pedicellariae which recall those of the adult, but spine movements are irregular and indeterminate, a fact possibly related to the incomplete state of the superficial nervous system.

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Document Type: Research Article

Publication date: 1952-01-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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