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Phylogeny of Aphroditiformia (Polychaeta) based on molecular and morphological data
Helena Wiklund1, Arne Nygren, Fredrik Pleijel
1Department of Zoology, Göteborg University, PO Box 463, Göteborg SE-405 30, Sweden. helena.wiklund@zool.gu.se
Molecular Phylogenetics and Evolution
|August 23, 2005
Summary
This study reveals that Palmyra and Pisione are nested within Aphroditiformia, a group of marine worms. Findings suggest Pisionidae and Pholoidae should be synonyms of Sigalionidae.
Area of Science:
- Marine Biology
- Zoology
- Systematics
Background:
- Aphroditiformia, commonly known as scale worms, are benthic polychaetes characterized by dorsal elytra.
- Understanding the evolutionary relationships within Aphroditiformia is crucial for polychaete taxonomy.
- The phylogenetic positions of non-elytrabearing taxa like Palmyra and Pisione remain unclear.
Purpose of the Study:
- To determine the phylogenetic placement of Palmyra and Pisione within Aphroditiformia.
- To clarify the evolutionary history and taxonomic status of scale worm families.
Main Methods:
- Phylogenetic analysis using nuclear 18S ribosomal DNA (rDNA) and mitochondrial cytochrome c oxidase subunit I (COI) gene sequences.
- Incorporation of 31 morphological characters into the analysis.
- Application of parsimony, maximum likelihood, and Bayesian inference methods for data analysis.
Main Results:
- Palmyra and Pisione were found to be nested within the Aphroditiformia clade.
- Palmyra is identified as the sister taxon to Aphrodita.
- Pisione and Pholoe were resolved within the family Sigalionidae, indicating polyphyly of existing families.
Conclusions:
- The results support the reclassification of Pisionidae and Pholoidae as junior synonyms of Sigalionidae.
- This study refines the understanding of scale worm phylogeny and taxonomy.
- The findings highlight the importance of molecular and morphological data in resolving systematic relationships.
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