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Ontogeny in the steinmanellines (Bivalvia: Trigoniida): an intra- and interspecific appraisal using the Early Cretaceous faunas from the Neuquén Basin as a case study

Published online by Cambridge University Press:  21 October 2021

Pablo S. Milla Carmona Open the ORCID record for Pablo S. Milla Carmona [Opens in a new window] ,
Dario G. Lazo  and
Ignacio M. Soto
Pablo S. Milla Carmona*
Affiliation:
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Geológicas, Instituto de Estudios Andinos “Don Pablo Groeber” (IDEAN, UBA-CONICET), Pabellón II, Ciudad Universitaria, Buenos Aires C1428EGA, Argentina. E-mail: millacarmona@gl.fcen.uba.ar, dlazo@gl.fcen.uba.ar
Dario G. Lazo
Affiliation:
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Geológicas, Instituto de Estudios Andinos “Don Pablo Groeber” (IDEAN, UBA-CONICET), Pabellón II, Ciudad Universitaria, Buenos Aires C1428EGA, Argentina. E-mail: millacarmona@gl.fcen.uba.ar, dlazo@gl.fcen.uba.ar
Ignacio M. Soto
Affiliation:
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ecología, Genética y Evolución, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA, UBA-CONICET), Pabellón II, Ciudad Universitaria, Buenos Aires C1428EGA, Argentina. E-mail: soto@ege.fcen.uba.ar
*
*Corresponding author.
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Abstract

Despite the paleontological relevance and paleobiological interest of trigoniid bivalves, our knowledge of their ontogeny—an aspect of crucial evolutionary importance—remains limited. Here, we assess the intra- and interspecific ontogenetic variations exhibited by the genus Steinmanella Crickmay (Myophorellidae: Steinmanellinae) during the early Valanginian–late Hauterivian of Argentina and explore some of their implications. The (ontogenetic) allometric trajectories of seven species recognized for this interval were estimated from longitudinal data using 3D geometric morphometrics, segmented regressions, and model selection tools, and then compared using trajectory analysis and allometric spaces. Our results show that within-species shell shape variation describes biphasic ontogenetic trajectories, decoupled from ontogenetic changes shown by sculpture, with a gradual decay in magnitude as ontogeny progresses. The modes of change characterizing each phase (crescentic growth and anteroposterior elongation, respectively) are conserved across species, thus representing a feature of Steinmanella ontogeny; its evolutionary origin is inferred to be a consequence of the rate modification and allometric repatterning of the ancestral ontogeny. Among species, trajectories are more variable during early ontogenetic stages, becoming increasingly conservative at later stages. Trajectories’ general orientation allows recognition of two stratigraphically consecutive groups of species, hinting at a potentially higher genus-level diversity in the studied interval. In terms of functional morphology, juveniles had a morphology more suited for active burrowing than adults, whose features are associated with a sedentary lifestyle. The characteristic disparity of trigoniids could be related to the existence of an ontogenetic period of greater shell malleability betrayed by the presence of crescentic shape change.

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Paleobiology , Volume 48 , Issue 2 , May 2022 , pp. 261 - 283
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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