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Shell shape convergence masks biological diversity in gliding scallops : Description of Ylistrum n. gen. (Pectinidae) from the Indo-Pacific Ocean
Mynhardt, Glené Alejandrino, Alvin Puslednik, Louise Corrales, Joezen Serb, Jeanne M.
Mynhardt, Glené
Alejandrino, Alvin
Puslednik, Louise
Corrales, Joezen
Serb, Jeanne M.
Abstract
The scallop genus Amusium Ro¨ding, 1798 is one of few genera of Pectinidae that includes taxa capable of long-distance swimming or gliding. Membership of the genus has been defined primarily by shell shape, and it currently includes only three species: the type species A. pleuronectes (Linnaeus, 1758), A. balloti (Bernardi, 1861) and A. japonicum (Gmelin, 1791). In this study, we use molecular data and aspects of shell morphology to resolve the systematics of the genus. Phylogenetic reconstruction of Pectinidae using nuclear and mitochondrial DNA sequence from four genes supports a polyphyletic Amusium. Differences in internal ribbing pattern provide morphological evidence for the recognition of the two clades identified in our phylogenetic analyses. In contrast, quantification of shell shape through geometric morphometric methods indicates that shape is a convergent phenotype and is not informative in terms of distinguishing between the two gliding lineages. Based on these results, we describe Ylistrum, n. gen, which includes two species previously assigned to Amusium. We provide characters that separate the now monotypic Amusium from the two species, Ylistrum balloti, n. comb. and Y. japonicum, n. comb.
Keywords
shell shape, gliding, Ylistrum
Date
2014
Type
Journal article
Journal
Book
Volume
80
Issue
4
Page Range
400-411
Article Number
ACU Department
School of Education
Faculty of Education and Arts
Faculty of Education and Arts
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Open Access Status
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Controlled
Controlled
Controlled
Notes
© The Author 2014.
Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved