Gnathostomulida—An Enigmatic Metazoan Phylum from both ...

Parsimony (and Other Methods), Version 4.0,’’ Sinauer Associates,
Sunderland, MA.
Swofford, D. L., Olsen, G. J., Waddell, P. J., and Hillis, D. M. (1996).
Phylogenetic inference. In ‘‘Molecular Systematics’’ (D. M. Hillis, C.
Moritz, and B. K. Mable Eds.), 2nd ed., pp. 407–514, Sinauer
Associates, Sunderland, MA.
Telford, M. J., and Holland, P. W. H. (1997). Evolution of 28S
ribosomal DNA in chaetognaths: Duplicate genes and molecular
phylogeny. J. Mol. Evol. 44: 135–144.
Thompson, J. D., Higgins, D. G., and Gibson, T. J. (1994). CLUSTAL-
W—Improving the sensitivity of progressive multiple sequence
alignment through sequence weighting, position-specific gap penalties
and weight matrix choice. Nucleic Acids Res. 22: 4673–4680.
AFFINITIES OF THE GNATHOSTOMULIDA
Van de Peer, Y., Jansen, J., De Rijk, P., and De Wachter, R. (1997).
Database on the structure of small ribosomal subunit RNA. Nucleic
Acids Res. 24: 111–116.
Wallace, R. L., Ricci, C., and Melone, G. (1996). A cladistic analysis of
pseudocoelomate (aschelminth) morphology. Invert. Biol. 115: 104–
112.
Wasson, K. (1997). Systematic revision of colonial kamptozoans
(entoprocts) of the Pacific coast of North America. Zool. J. Linn.
Soc. 121:1–63.
Winnepenninckx, B., Backeljau, T., Mackey, L. Y., Brooks, J. M., De
Wachter, R., Kumar, S., and Garey, J. R. (1995). 18S rRNA data
indicate that Aschelminthes are polyphyletic in origin and consist
of at least three distinct clades. Mol. Biol. Evol. 12: 1132–1137.
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