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Biol Bull 161: 141-151. (August 1981)
© 1981 Marine Biological Laboratory
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DEVELOPMENT OF A "PRIMITIVE" SEA URCHIN (EUCIDARIS TRIBULOIDES:) IRREGULARITIES IN THE HYALINE LAYER, MICROMERES, AND PRIMARY MESENCHYME

THOMAS E. SCHROEDER 1

1 Friday Harbor Laboratories, University of Washington, Friday Harbor, Washington, U. S. A. 98250; and Discovery Bay Marine Laboratory, University of West Indies, Discovery Bay, Jamaica

The normal embryonic development of the cidaroid sea urchin Eucidaris tribuloides from fertilization to the late two-armed larval stage is described with the aid of light and electron microscopy. Unusual developmental features include a virtual absence of a hyaline layer, irregularities in the number and size of micromeres, and a total lack of early mesenchyme (the so-called primary mesenchyme). These and other features are unlike developmental characters in the euechinoids ("modern" sea urchins). They are discussed with reference to the phylogeny of sea urchins. Eucidaris tribuloides may exhibit "primitive" developmental patterns representative of the cidaroid ancestor which was common to all living sea urchins.

Submitted on February 9, 1981
Accepted on April 14, 1981




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