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Functional morphology of the gastric mill of the swimming crab Ovalipes trimaculatus (Decapoda: Portunidae)

Published online by Cambridge University Press:  30 May 2017

Paula de La Barra*
Affiliation:
Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina Instituto de Biología Marina y Pesquera Almirante Storni, Escuela Superior de Ciencias Marinas, Universidad Nacional del Comahue, Av. Güemes 1030, CP 8520 San Antonio Oeste, Río Negro, Argentina Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Ciudad Autónoma de Buenos Aires, Argentina
Maite Narvarte
Affiliation:
Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina Instituto de Biología Marina y Pesquera Almirante Storni, Escuela Superior de Ciencias Marinas, Universidad Nacional del Comahue, Av. Güemes 1030, CP 8520 San Antonio Oeste, Río Negro, Argentina
Verónica Williner
Affiliation:
Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina Instituto Nacional de Limnología (INALI CONICET-UNL), Facultad de Humanidades y Ciencias, Universidad Nacional del Litoral (FHUC-UNL), Ciudad Universitaria, CP 3000 Santa Fe, Argentina
*
Correspondence should be addressed to: P. de La Barra, Instituto de Biología Marina y Pesquera Almirante Storni, Escuela Superior de Ciencias Marinas, Universidad Nacional del Comahue, Av. Güemes 1030, CP 8520 San Antonio Oeste, Río Negro, Argentina email: delabarrapaula@gmail.com

Abstract

The stomach of Decapod crustaceans is a complex structure with great interspecific variation. Several studies suggest that the anatomy of the gastric mill varies according to the diet of species in different groups. An alternative view suggests the gastric mill's structure is related to phylogenetic aspects rather than to the diet of a species. The morphology of the gastric mill of Ovalipes trimaculatus, a portunid crab target of fisheries in Argentina and Chile, was studied through stereo-microscope and scanning electron microscope images. Ovalipes trimaculatus has a stomach that corresponds to a macrophagous and predatory diet. The gastric mill is similar to that of other portunids, especially those with predominant animal component in their diet. Our results support the idea that this structure has a basic pattern, given by shape and elements forming the gastric mill; and upon that pattern, trophic habits adaptively shape certain traits.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2017 

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