You are here

Monophyly versus theCephalaspidea (Gastropoda, Opisthobranchia) with an analysis of traditional Cephalaspid characters

Download pdf | Full Screen View

Date Issued:
1993
Title: Monophyly versus theCephalaspidea (Gastropoda, Opisthobranchia) with an analysis of traditional Cephalaspid characters.
71 views
16 downloads
Name(s): Mikkelsen, Paula M.
Harbor Branch Oceanographic Institute
Type of Resource: text
Genre: Article
Date Issued: 1993
Publisher: Societa Italiana di Malacologia
Place of Publication: Milan, Italy
Physical Form: pdf
Extent: 22 p.
Language(s): English
Identifier: FA00007259 (IID)
Note(s): The opisthobranch order Cephalaspidea is well-recognized as an unnatural, paraphyletic group characterized by «evolutionary trends» toward reduction and loss of many features. A survey of 35 key classifications and published phylograms involving cephalaspids revealed a general lack of morphological definition for the order and the tenacious use of traditional characters. Of 49 frequently-used characters, 44 (90%) are problematic for use in modern phylogenetic (cladistic) analyses due to reductive nature, non-homology, incompleteness, or other grounds. Claims of «rampant parallelism» involving a majority of these characters are based on a priori decisions and are therefore presently unjustified. The few consistent family groups in published phylograms are most strongly supported by characters correlated with diet, and may therefore also be open to question. Successful resolution of the phylogeny of these and other <Florida Atlantic University. Harbor Branch Oceanographic Institute contribution 999
This manuscript is an author version with the final publication available and may be cited as: Mikkelsen, P. M. (1993). Monophyly versus the Cephalaspidea (Gastropoda, Opisthobranchia) with an analysis of traditional Cephalaspid characters. Bollettino Malacologico, 29(5-8), 115-138.
Subject(s): Phylogeny
Cladistic analysis
Homoplasy
Cephalaspidea
Opisthobranchia
Persistent Link to This Record: http://purl.flvc.org/fau/fd/FA00007259
Host Institution: FAU