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Dentition facilitates the release of encapsulated Ragged-tooth Shark (Carcharias taurus) embryos
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Dentition facilitates the release of encapsulated Ragged-tooth Shark (Carcharias taurus) embryos
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Journal Article
Dentition facilitates the release of encapsulated Ragged-tooth Shark (Carcharias taurus) embryos
2017
Overview
The capture of four female Ragged-tooth Sharks,
Carcharias taurus,
in the early stages of pregnancy in the bather protective nets along the KwaZulu-Natal coastline provided an opportunity to investigate embryonic development. A total of 31 embryos, 8–225 mm total length, were found. Of these, 15 were encapsulated and 16 were found free-floating in the uterus. Six embryos, three of which were encapsulated (35–50 mm) and three free-floating (36–52 mm), were examined under both light and scanning electron microscopy. The embryos possessed tooth-like structures. Spectral analysis of these structures revealed the presence of calcium, phosphorus, fluoride and oxygen, which supports the hypothesis that they are teeth. These teeth would enable embryos to escape encapsulation. These free-floating embryos are the smallest on record, with the previous smallest being a 40 mm embryo. These findings would now amend the current literature of
C. taurus
embryology. These results could affect the current understanding of
C. taurus
reproduction and biology and may impact any current breeding programs that are attempting to increase the fecundity of these species.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
/ Animal Systematics/Taxonomy/Biogeography
/ Biology
/ Biomedical and Life Sciences
/ Breeding
/ Calcium
/ coasts
/ Embryos
/ females
/ Floating
/ oxygen
/ Scanning electron microscopy
/ Sharks
/ Teeth
/ Uterus
/ Zoology
