Turbellarian taxonomic database

Record # 17603
Hooge MD, Haye P, Tyler S, Litvaitis MK, Kornfield I (2002)
Molecular systematics of the Acoela (Platyhelminthes) and its concordance with morphology.
Molecular Phylogeny and Evolution 24:333-342

Abstract / Notes

"The phylogenetic relationships of the lower worm group Acoela were investigated
using newly obtained nuclear 18S rDNA sequences from 16 acoels in combination
with 16 acoel sequences available on GenBank from other laboratories. Parsimony
and maximum likelihood analyses of the molecular data supported the concept
that the Acoela is monophyletic; however, the gene tree produced by these
analyses conflicts with the current taxonomic system for the Acoela in several
family-level groupings. Most notable is the apparent polyphyly of the largest
family of acoels, the Convolutidae. DNA analysis grouped together species of
small-bodied convolutids in one clade, while large-bodied convolutids grouped
in a separate clade with other large-bodied acoels. Despite such conflicts, the
branching pattern in the gene tree is well supported by morphological
characters of sperm and body-wall musculature."

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