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The Systematic Significance of Palp Morphologyin the Polydora Complex (Polychaeta: Spionidae)

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The palp morphology of Dipolydora coeca, D. quadrilobata, Polydora ciliata, P. cornuta and Pseudopolydora pulchra were studied with light and scanning electron microscope. Two new palp characters were found on the two species of Dipolydora: randomly scattered motile cirri and glandular holes. The palp morphology of the investigated species is compared with earlier reports on other members of the Polydora complex. Congeneric palp similarities are found in Polydora and Dipolydora. A single exception is the aberrant Dipolydora commensalis, which has a distinctive palp morphology not found in any other spionid. The palp morphology of the two closely related genera Dipolydora and Polydora is significantly different, which supports the validity of the recently resurrected genus Dipolydora. Comparative studies indicate that the palp morphology of Pseudopolydora pulchra closely resembles that of Dipolydora. The recently studied palp morphology of Boccardia polybranchia has many similarities with that of Polydora.

Keywords: Boccardia; Dipolydora; Polydora; Pseudopolydora; Scanning electron microscopy; ciliary groups

Document Type: Original Article


Affiliations: Zoological Museum, University of Copenhagen, Copenhagen Ø, Denmark

Publication date: 2001-05-01

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