Meeting Abstract
130.7 Tuesday, Jan. 7 15:00 Phylogeny of Chaetopteridae (Annelida) MOORE, J. M.*; NISHI, E.; ROUSE, G. W.; Florida Museum of Natural History, University of Florida; Yokohama National University, Japan; Scripps Inst. of Oceanography, Univ. of California San Diego jmoore@ufl.edu
Chaetopteridae is a globally distributed clade of polychaetes in need of thorough systematic revision. Most chaetopterids live in straight tubes in marine sediments and use a pair of long palps for suspension or deposit feeding. However, Chaetopterus sp. are well known for showing extremely specialized mucus-bag suspension feeding, and Chaetopterus cf. variopedatus is used as model organism, though the species delineation is very uncertain in this genus. The current taxonomy of Chaetopteridae recognizes four genera: Phyllochaetopterus, Spiochaetopterus, Mesochaetopterus, and Chaetopterus. In order to assess the relationships among chaetopterids, we constructed a phylogenetic hypothesis using a morphological dataset for 65 nominal species and DNA sequence data for 23 morphospecies, with representatives from the four accepted genera. Forty-four characters were developed using morphology and were mainly scored from the literature. For the DNA data, multiple specimens per morphological species were included to assess cryptic diversity. Specimens were collected from French Polynesia, Hawaii, Japan, Australia, Spain, Greenland, Antarctica, and both coasts of the United States. Several deep Pacific species were also included in the analysis. COI mitochondrial DNA, 18S nuclear DNA, and 28S ribosomal RNA were sequenced. Combined and individual datasets were used to build phylogenies using maximum parsimony and maximum likelihood approaches. The results consistently revealed extensive paraphyly in Spiochaetopterus and Phyllochaetopterus. Chaetopterus forms a clade nested within the Mesochaetopterus grade. There is cryptic diversity in several Indo-West Pacific morphospecies, and evidence for restricted geographic ranges in several nominal species unrecognized by past systematists.
