Morphological studies of the composition of the Green Turtle (Chelonia mydas) hyoid bones found in Peruibe, Southern Coast of Brazil, Mosaic of Conservation Units Jureia-Itatins

Abstract

Chelonia mydas, popularly known as the green turtle, is widely distributed in tropical seas and uses as its feeding area the coastal region of Peruíbe, located on the southern coast of São Paulo State. It has a solid cranial formation, without temporal openings and formed by the junction of several small bones, among them the hyoid bones that have the function of supporting the tongue. In a study conducted with 10 individuals of the same species and with similar sizes, the objective was to verify the presence of a differentiated bone structure that has not been described in any study until the present moment and to verify if it was not only anatomical variation generated by any anomaly. in the evaluated animals. The techniques used for verification were computed tomography (with window for bone parts: center -WL 300 and width -WW 1,500) and histological analysis. For histology, the hyoid bone structure was removed from the skull separation and disarticulation and tongue extraction. With the separation of the bones, cuts of approximately 0.5 cm in length were made and fixed in 10% paraformaldehyde, with subsequent application of the fixation procedure, for observation with scanning electron microscopy. The structure analyzed was identified in 6 individuals. This proves that it is part of the formation of the hyoid bone, so it is necessary to name this structure and carry out in-depth studies to know its importance and to verify if it is a modification that is affecting the species or if it is a genetic variation that affected population studied.