The family Sipunculidae (Sipuncula): body wall structure and phylogenetic relationships
Abstract:The sipunculan family Sipunculidae, common in Florida waters, contains five genera (Phascolopsis, Siphanomecus, Siphanasoma, Sipunculus, and Xenasiphon). Eight morphological characters of these genera are evaluated from an evolutionary standpoint with particular attention to the nature of the body wall and the form of the coelomic extensions into this wall. These characters are used in a phylogenetic analysis, and an evolutionary hypothesis is presented which includes the description of a hypothetical ancestor to this family (identical to present-day Phascolopsis).
Document Type: Research Article
Publication date: May 1, 1986
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