Document Detail

Opposed ciliary bands in the feeding larvae of sabellariid annelids.
MedLine Citation:
PMID:  21712227     Owner:  NLM     Status:  In-Data-Review    
The larvae of marine annelids capture food using an unusual diversity of suspension-feeding mechanisms. Many of the feeding mechanisms of larval annelids are poorly known despite the abundance and ecological significance of both larvae and adults of some annelid taxa. Here we show that larvae of two species of sabellariid annelids, Sabellaria cementarium and Phragmatopoma californica, bear prototrochal and metatrochal cilia that beat in opposition to each other. For larvae of S. cementarium, we provide evidence that these opposed bands of cilia are used to capture suspended particles. In video recordings, captured particles were overtaken by a prototrochal cilium and then moved with the cilium to the food groove, a band of cilia between the prototroch and metatroch. They were then transported by cilia of the food groove to the mouth. Lengths of the prototrochal cilia, lengths of the prototrochal ciliary band, size range of the particles captured, and estimated rates of clearance increased with larval age and body size. Confirmation of the presence of opposed bands in larvae of sabellariids extends their known occurrence in the annelids to members of 10 families. Opposed bands in these different taxa differ in the arrangements and spacing of prototrochal and metatrochal cilia, and in whether they are used in combination with other feeding mechanisms. Opposed bands appear to be particularly widespread among the larvae of sabellidan annelids (a clade that includes sabellariids, sabellids, and serpulids), even in some species whose larvae do not feed. A parsimony analysis suggests that opposed bands are ancestral in this clade of annelids.
Bruno Pernet; Richard R Strathmann
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Biological bulletin     Volume:  220     ISSN:  1939-8697     ISO Abbreviation:  Biol. Bull.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-06-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984727R     Medline TA:  Biol Bull     Country:  United States    
Other Details:
Languages:  eng     Pagination:  186-98     Citation Subset:  IM    
Department of Biological Sciences, California State University, Long Beach, 1250 Bellflower Blvd., Long Beach, California 90840.
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