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The incubatory chamber of marsupial carditids (Bivalvia: Carditidae: Thecaliinae) as an exaptation

Published online by Cambridge University Press:  19 March 2021

Damián Eduardo Pérez*
Affiliation:
Instituto Patagónico de Geología y Paleontología (IPGP CCT CONICET-CENPAT), Boulevard Brown 2915, U9120CD, Puerto Madryn, Chubut, Argentina. E-mail: trophon@gmail.com
Ignacio María Soto
Affiliation:
Grupo de Biología Integral de Sistemas Evolutivos, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, UBA, and CONICET-Instituto de Ecología, Genética y Evolución de Buenos Aires, CABA, Argentina. E-mail: soto@ege.fcen,uba.ar
*
*Corresponding author.

Abstract

Marsupial carditids of the subfamily Thecaliinae are characterized by the presence of an “incubatory chamber” in female shells, where the eggs hatch and develop during their first stages. According to recent phylogenetic studies, Thecaliinae are closely related to Carditinae, a group that has a byssal gape. This structure occurs in the same area as the incubatory chamber, and both structures could be evolutionarily related. Using the newest phylogenetic context for the subfamilies, we test whether the incubatory chamber of Thecaliinae is related to characters present in Carditinae. We also provided a more precise definition of the implied structures. Two distinct morphologies for the incubatory chamber are described: one with an exteriorly opened pouch (present in the genera Powellina and Milneria) and the other with a completely internal funicular infold (present in Thecalia). The byssal gape is present in the Cardiobyssata clade (Carditamerinae + (Carditinae + Thecaliinae)), and we discuss whether the incubatory chamber could be the result of an exaptation event, and the possible evolutionary pathways implied. According to the present evidence, we propose a co-optation of the byssal gape into a new function (brooding of larvae) at some point during the transition from the Carditinae to the Thecaliinae lineages, thus determining an exaptation. Adaptative processes probably modified this structure into the incubatory chamber (an external pouch first, and a funicular infold later). We discuss alternative scenarios and implications on phylogenetic studies and the importance of considering non-adaptative evolutionary scenarios in the study of evolutionary narratives.

Type
Articles
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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References

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