Jaw morphology and ontogeny in five species of Ophryotrocha
Article first published online: 13 OCT 2009
Copyright © 2009 Wiley-Liss, Inc.
Journal of Morphology
Volume 271, Issue 3, pages 324–339, March 2010
How to Cite
Macnaughton, M. O., Worsaae, K. and Eibye-Jacobsen, D. (2010), Jaw morphology and ontogeny in five species of Ophryotrocha. J. Morphol., 271: 324–339. doi: 10.1002/jmor.10800
- Issue published online: 3 FEB 2010
- Article first published online: 13 OCT 2009
- Manuscript Accepted: 16 AUG 2009
- Manuscript Revised: 12 AUG 2009
- Manuscript Received: 11 JUN 2009
- Danish Natural Science Research Council. Grant Number: FNU 272-06-0260
Detailed scanning electron microscopy of jaws within the genus Ophryotrocha (Dorvilleidae, Annelida) was performed on 871 jaw parts. The investigations resulted in new understandings of the ontogeny and jaw morphology and have systematic implications for the family. Five species in the genus (Ophryotrocha alborana, O. diadema, O. gracilis, O. hartmanni, and O. labronica pacifica) were kept in culture, and the development of the jaws was studied by sampling throughout their life history. Ophryotrocha species have mandibular plates that remain the same throughout ontogeny, whereas the posterior shafts elongate. Both mandibular plate morphology and shaft ontogeny have species-specific distinctions. In Ophryotrocha, the maxillae can be assigned to three to four distinct types, which are replaced by moulting. The maxillary morphology and developmental stages at which moults occur are species specific, although with broad intervals. A redefinition is given for some of the basic jaw elements, and new homologies are proposed for structures that are also present across other dorvilleid taxa. J. Morphol. 2010. © 2009 Wiley-Liss, Inc.