On the enameloid microstructure of Archaeobatidae (Neoselachii, Chondrichthyes)

Autor: D. Delsate, Héctor Botella, Esther Manzanares
Rok vydání: 2018
Předmět:
Zdroj: Journal of Iberian Geology. 44:67-74
ISSN: 1886-7995
1698-6180
DOI: 10.1007/s41513-018-0049-3
Popis: In this study, we present new data regarding the enameloid microstructure of the oldest batoid family, Archaeobatidae. First, all the teeth were etched superficially with HCl 10% for 5 s and photographed in the SEM. Afterwards, the same teeth were embedded in Canadian Balsam, polished and etched again with HCl 10% in order to reveal the enameloid microstructure before being photographed a second time. The enameloid layer of Archaeobatidae consists on a superficial single crystallite enameloid (SCE) with a parallel bundled enameloid (PBE) in all the taxa studied, but only in Toarcibatis and Cristabatis there exists a tangled bundled enameloid (TBE) under it. The structural complexity and diversity found in Archaeobatidae are comparable to that recently described in others fossil batoids. Our data suggest a general trend to “simplification” in batoid enameloid up till the homogeneous single crystallite enameloid that is present in the majority of current batoids; which contrasts with the increasing structural complexity present in selachimorphs.
Databáze: OpenAIRE
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