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Shell phenotypic variation in the south-western Atlantic gastropod Olivancillaria carcellesi (Mollusca: Olividae)

Published online by Cambridge University Press:  27 September 2010

Valeria Teso ,
Javier H. Signorelli  and
Guido Pastorino
Valeria Teso*
Affiliation:
Museo Argentino de Ciencias Naturales, Avenida Angel Gallardo 470, Laboratorio 57, C1405DJR, Buenos Aires, Argentina
Javier H. Signorelli
Affiliation:
Museo Argentino de Ciencias Naturales, Avenida Angel Gallardo 470, Laboratorio 57, C1405DJR, Buenos Aires, Argentina
Guido Pastorino
Affiliation:
Museo Argentino de Ciencias Naturales, Avenida Angel Gallardo 470, Laboratorio 57, C1405DJR, Buenos Aires, Argentina
*
Correspondence should be addressed to: V. Teso, Museo Argentino de Ciencias Naturales, Avenida Angel Gallardo 470, Laboratorio 57, C1405DJR, Buenos Aires, Argentina email: [email protected]
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Abstract

Phenotypic variation on shell size and shape of Olivancillaria carcellesi from four representative localities is confirmed using geometric morphometric techniques. This species lives along the entire range of the genus in subtidal soft bottoms from Rio de Janeiro (Brazil) to Punta Pardelas (Chubut, Argentina). Thickness of columellar callus, length and width are the main shell differences from specimens collected at several intermediate localities: Cassino (Brazil), La Paloma (Uruguay) and Mar del Plata (Argentina). All forms showed significant differences in shell size except O. carcellesi from La Paloma compared with those from Mar del Plata. The group with larger specimens was from Cassino. Olivancillaria carcellesi from Punta Pardelas, the southernmost population, was the smaller sized group and showed allometry between size and shape and this is responsible for their relatively higher spires. The possible ecological implications of the observed pattern are discussed. It is confirmed that O. carcellesi although variable, is a clearly defined species.

Keywords

Argentinaintraspecific variationmolluscsgeometric morphometric analysisOlivancillaria
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 91 , Issue 5 , August 2011 , pp. 1089 - 1094
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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