Comparative investigation into the morphology of oral papillae and denticles of four species of lamnid and sphyrnid sharks

Autor(es)

Rangel, Bianca de Sousa ^[1] ; Salmon, Thierry ^[2] ; Poscai, Aline Nayara ^[3] ; Kfoury, Jr., Jose Roberto ^[2] ; Grassi Rici, Rose Eli ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Biociencias, Dept Fisiol, Rua Matao, Travessa 14, 321, BR-05508090 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Dept Cirurgia, Fac Med Vet & Zootecnia, Rua Prof Orlando Marques Paiva S-N, BR-05508270 Sao Paulo, SP - Brazil

^[3] Univ Estadual Paulista, Lab Pesquisa Elasmobranquios, Praca Infante Dom Henrique S-N, Sao Vicente, SP - Brazil

^[4] Univ Sao Paulo, Fac Med Vet & Zootecnia, Cent Facilidades Pesquisa, Rua Prof Orlando Marques Paiva S-N, BR-05508270 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ZOOMORPHOLOGY; v. 138, n. 1, p. 127-136, MAR 2019.
• Citações Web of Science: 1

Resumo

The microstructures of the oral cavity in sharks have received relatively little study, despite their potential functional importance for gustation, feeding, and ventilation. Accordingly, here we conducted a preliminary comparative investigation into the structure and organization of oral papillae and denticles found on the ventral surface of the oral cavity in four species of shark (bigeye thresher, shortfin mako, scalloped hammerhead, and smooth hammerhead). Despite a limited sample size, differences in complexity and ornamentation of oral papillae and denticles were found across the four species. The scalloped hammerhead shark exhibited the largest oral papillae compared to the bigeye thresher and the shortfin mako. The most complex oral denticles, in terms of number of ridges and microstructures, were found in the scalloped hammerhead, followed by the bigeye thresher, smooth hammerhead and shortfin mako. For smooth hammerheads, in which samples were available from both juveniles and adults, differences in denticle microstructures were found suggesting possible ontogenetic variations. These results suggest that shape, size and arrangement of oral papillae and denticles may be related to ecology and phylogeny of the species studied. Based on these emerging patterns we discuss several plausible hypotheses relating to the function of these structures for consideration in future studies. (AU)

• Processo FAPESP: 17/25273-0 - Ecofisiologia e relações tróficas de elasmobrânquios: biomarcadores como ferramentas para conservação
• Beneficiário: Bianca de Sousa Rangel
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/09095-2 - Lipídios e isótopos estáveis como indicadores de investimento materno e estratégias nutricionais neonatais em raias vivíparas histotróficas
• Beneficiário: Bianca de Sousa Rangel
• Modalidade de apoio: Bolsas no Brasil - Mestrado