title: Cryptic species and morphological plasticity in long-lived bivalves (Unionoida: Hyriidae) from inland Australia.
abstract: Molecular (mitochondrial DNA, isozyme) and morphological diversity of freshwater mussels (Family Hyriidae) was examined at 21 sites encompassing four large river systems, across southwest Queensland, Australia. Evidence was found for two major morphological groups. One group, which occurred in every river system, closely matched a recognized species (Velesunio ambiguus) both morphologically and in a well-supported lineage within a mitochondrial phylogeny generated from partial cytochrome c oxidase subunit I (COI) sequences. The second group most closely matched Velesunio wilsonii in shell morphology but formed three deeply divergent mitochondrial DNA lineages. All four lineages occurred sympatrically in some areas and displayed corresponding fixed differences at nuclear allozyme loci, which suggests an absence of recent hybridization and the presence of separate species.
authors.affiliation: Cooperative Research Centre for Freshwater Ecology, Australian School of Environmental Studies, Griffith University, Nathan, Queensland 4111, Australia. abaker@griffith.edu.au
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Baker
authors.forename: Chris
authors.initials: C
authors.lastname: Bartlett
authors.forename: Stuart E
authors.initials: SE
authors.lastname: Bunn
authors.forename: Katrina
authors.initials: K
authors.lastname: Goudkamp
authors.forename: Fran
authors.initials: F
authors.lastname: Sheldon
authors.forename: Jane M
authors.initials: JM
authors.lastname: Hughes
mesh_terms: D000818:Animals; D001315:Australia; D001483:Base Sequence; D001499:Bayes Theorem; D044822:Biodiversity; D049872:Bivalvia / Q000033:anatomy & histology* / Q000235:genetics*; D001837:Body Weights and Measures; D016000:Cluster Analysis; D004272:DNA, Mitochondrial / Q000235:genetics; D005618:Fresh Water; D005843:Geography; D007527:Isoenzymes; D016013:Likelihood Functions; D008957:Models, Genetic; D008969:Molecular Sequence Data; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D004272:DNA, Mitochondrial; D007527:Isoenzymes