Abstract
Dental sexual dimorphism has been described for different species of batoids, and it has been suggested that this differentiation is advantageous to reproduction in most cases. The aim of the present study was to investigate the morphology of the dentition in the ray Urotrygon microphthalmum using scanning electron microscopy. The present study brings a detailed description of morphological characteristics in males and females during ontogenetic development. Dental sexual dimorphism was observed both in maturing and mature males, while females maintain the same crushing shape dentition during all development stages. The teeth modification in males corresponds to the onset of maturation, which occurs when the animal reaches approximately 171.7 mm in total length, indicating that this morphological modification is closely related to mating behavior—grasp females during copulation thus ensuring body attachment and clasper insertion during swimming.
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Acknowledgments
We are grateful to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for Scientific initiation scholarship, the Brazilian funding agency Fundação de Amparo à Ciência e Tecnologia do Estado de Pernambuco (FACEPE) for providing a Doctor of Science scholarship (IBPG-0934-2.04/10) to J.S.-N. and a research Grant was assigned by Conselho Nacional de Desenvolvimento Científico e Tecnológico_CNPq (Pq 303251/2010-7) to R.P.L. The authors would like to thank the anonymous reviewers. We also thank Natascha Wosnick for revising the manuscript.
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Communicated by A. Schmidt-Rhaesa.
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de Sousa Rangel, B., Santander-Neto, J., Rici, R.E.G. et al. Dental sexual dimorphism and morphology of Urotrygon microphthalmum . Zoomorphology 135, 367–374 (2016). https://doi.org/10.1007/s00435-016-0312-0
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DOI: https://doi.org/10.1007/s00435-016-0312-0