|
ARCHIVED DATA FOR: Aktipis,
S. H., G. Giribet, D. R. Lindberg, and W. F. Ponder. 2008. Gastropod Phylogeny: an Overview and Analysis. Pp. 199- 236 in Phylogeny and Evolution of the
Mollusca. (W. F. Ponder & D. R.
Lindberg, eds.). University of California Press,
Berkeley. |
 |
|
Abstract.
–
This
study is the first to use multiple molecular loci (ca.
3.2
Kb) and 166 morphological characters in a simultaneous analysis to provide
one of the most comprehensive analyses of internal relationships among
major gastropod clades. In this study,
hypotheses of gastropod phylogeny based on the analysis of morphological
or molecular data sets alone differed dramatically. Furthermore, results
for individual molecular partitions were unstable because alignment
parameters were varied, and only when the morphological data was included
did the results become more stable. The monophyly of Gastropoda was
not obtained under any molecular partitions, but after the inclusion of
morphological characters a monophyletic Gastropoda was recovered. Additionally, the jackknife
support for most other clades increased in the
combined analysis of all data; morphology provided additional support to
the deepest nodes, while molecules in general added support to the
shallower nodes of the tree. This result supports the arguments of
proponents of the total-evidence approach; the most reliable evolutionary
hypothesis for a particular group can be generated only by using all
available data in the analysis.
Download
molecular and morphological data sets |