Abstract
Abstract Haminaea navicula and H. exigua, primitive opisthobranchs (Cephalaspidea), show annual life cycles with a period of egg deposition in late spring and death of the adults after spawning. Spawn formation and egg masses are described. For comparison a review of literature data on other cephalaspids is provided. A discussion on the classification of spawn types and their correlation with developmental types and egg size of cephalaspids is included.
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