The evolution of brooding characters among the freshwater pearly mussels (Bivalvia : Unionoidea) of North America

Citation
Dl. Graf et Do. Foighil, The evolution of brooding characters among the freshwater pearly mussels (Bivalvia : Unionoidea) of North America, J MOLLUS ST, 66, 2000, pp. 157-170
Citations number
95
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
JOURNAL OF MOLLUSCAN STUDIES
ISSN journal
0260-1230 → ACNP
Volume
66
Year of publication
2000
Part
2
Pages
157 - 170
Database
ISI
SICI code
0260-1230(200005)66:<157:TEOBCA>2.0.ZU;2-T
Abstract
Brooding characters have figured prominently in the classification of North American freshwater pearly mussels (Bivalvia: Unionoidea). The purpose of our study was to evaluate phylogenetic hypotheses of brooding character evo lution in order to test homology statements suggested by earlier taxonomic systems of the Unionoidea. Parsimony analysis of partial COI sequences from 29 species of freshwater mussels and 13 outgroups were used to derive a ph ylogeny. Thirteen brooding characters (e.g., brooding period, marsupium arr angement, structure of interlamellar septa, etc.) were traced onto this phy logeny. Results indicate that long-term brooding (bradytictia) is the deriv ed state among North American freshwater mussels: short-term brooding (tach ytictia) is plesiomorphic. Bradytictia evolved independently in the Anodont inae and Lampsilini, with unique morphological modifications derived in tho se clades to facilitate long-term brooding.