Anatomical Features of Modellnaia siamensis (Mollusca, Bivalvia, Unionidae) |
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Authors: | WILLIAM H. HEARD GARY W. HANNING |
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Affiliation: | Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA. |
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Abstract: | Although conchologically an etheriid mussel, M. siamensis from northeastern Thailand is, according to anatomical and larval features, an unionid. Its unique character states among the Unionidae are: relatively distant spacing of septa in all four demibranchs in both, males and females, absence of a foot in adults, and generation of subelliptical glochidial larvae. This species is seemingly a phylogenetic relic. |
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