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Discriminating among similar deep-sea Yoldiella (Pelecypoda: Protobranchia) species with a morphometric approach

Published online by Cambridge University Press:  04 March 2011

Natalia Pereira Benaim  and
Ricardo Silva Absalão
Natalia Pereira Benaim*
Affiliation:
Departmento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil, CEP 21941-570
Ricardo Silva Absalão
Affiliation:
Departmento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil, CEP 21941-570
*
Correspondence should be addressed to: N.P. Benaim, Departmento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil, CEP 21941-570 email: nataliabenaim@gmail.com
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Abstract

Eight species of Yoldiella (Yoldiella biguttata Allen, Sanders & Hannah, 1995; Yoldiella similis Allen, Sanders & Hannah, 1995; Yoldiella extensa Allen, Sanders & Hannah, 1995; Yoldiella aff. jeffreysi (Hidalgo, 1877); Yoldiella sp.1; Yoldiella sp. 2; Yoldiella sp. 3 and Yoldiella sp. 4) from the continental slope off Rio de Janeiro were used to test if quantitative morphometric measurements of shell shape and hinge plate could effectively discriminate among them. Thirty specimens of each species were sampled, and a total of 25 variables were established and utilized as input data to perform a discriminant analysis. The percentage of correctly classified cases was never less than 80%. The hinge plate variables were always relevant, and the most important one was the width of the posterior hinge plate. On the other hand, shell shape variables, when present, were secondary. Considering that the variation in the shell of Yoldiella species is subtle, and also the findings of this study, we can state that the hinge plate morphometry has good potential to improve species discrimination.

Keywords

morphometrydeep-seaPelecypodaProtobranchiaYoldiella
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Issue 8 , December 2011 , pp. 1665 - 1672
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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