Larval Development in the Asteroid Echinaster Echinophorus.

  title={Larval Development in the Asteroid Echinaster Echinophorus.},
  author={David G. Atwood},
  journal={The Biological bulletin},
  volume={144 1},
1. Echinaster echinophorus off the west coast of Florida was observed to spawn, from early April to late July, two different egg types: one type is pelagic, brown to black in color and 1.0-1.3 mm in diameter, while the second is bright orange, ranges from 0.84 to 0.88 mm in diameter and settles immediately to the substratum after spawning. 2. The present study reports on external morphogenesis of Echinaster eggs of the second type. 3. Cleavage stages occurred rapidly at the laboratory… CONTINUE READING