Skip to main content

Free Content Polychaetes have evolved feeding larvae numerous times

Download Article:
 Download
(PDF 602.44140625 kb)
 
'Trochophore' is commonly used to designate larvae with opposed-band feeding and a particular set of ciliary bands. The trochophore has been proposed to represent the ancestral larval form for a group of metazoan phyla as well as for the Annelida. The name trochophore is also often applied to larvae that do not conform to the above definition. A cladistic analysis of spiralian taxa (with special reference to polychaetes), based on a suite of adult and larval characters, is used to assess whether the trochophore (sensu stricto) is a plesiomorphic form for Spiralia or taxa such as Polychaeta. The results favor the conclusion that the trochophore, if defined as a feeding larval form using opposed bands, should not be regarded as plesiomorphic for Spiralia, or any other large taxon such as Polychaeta. The trochophore is therefore re-defined as a larval form with a prototroch. This broad definition covers a wide variety of larvae, and matches the current usage more accurately than the restricted term. The evolution of feeding larvae in a more general sense is also assessed. It is concluded that lecithotrophy is the plesiomorphic condition for polychaetes and that feeding larvae have evolved multiple times. This conclusion is supported by the fact that among polychaete larvae there a number of different feeding mechanisms. Some of these novel feeding modes have yet to be adequately described.
No References for this article.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2000-07-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more