Abstract
Purpose
In the present study, we described, for first time, the chondrichthyan fauna from several Middle-Late Triassic sections in the Betic Domain and compare it with other recent described coeval faunas from the Iberian Ranges.
Methods
Specimens were retrieved after the dissolution (with 10% acetic acid) of carbonate rocks.
Results
The assemblage comprises of seven species belonging to six genera (Hybodus plicatilis, Omanoselache bucheri comb. nov., Omanoselache contrarius comb. nov., Lonchidion derenzii, Lissodus aff. L. lepagei, Pseudodalatias henarejensis and cf. Rhomaleodus budurovi), most of them non-nesoselachian. Chondrichthyans remains occur in levels dating from Ladinian to Carnian according with bivalves, ammonoids and conodonts.
Conclusions
The findings are comparable, in taxonomical terms, to the chondrichthyan fauna from the Ladinian of the Iberian Range that was recently described, although chondrichthyans seems noticeably less abundant in the Betic Domain. Most of the species found occur also in the Iberian Range, with the exception of Lonchidion derenzii and cf Rhomaleodus budurovi, which occur in the Boyar Section, dated as Carnian. The small size of all teeth recovered, belonging probably to young specimens, suggest that the very shallow epicontinental environments recorded in Middle-Upper Triassic rocks from the Betic Domain could be used as nursery areas.
Resumen
Objetivo
En el presente estudio describimos por primera vez, la fauna de condrictios de diversas secciones del Triásico Medio-Tardío en el Dominio Bético y lo comparamos con otras faunas parecidas descritas recientemente en la Cordillera Ibérica.
Metodología
Los ejemplares fueron recuperados después de la disolución (con ácido acético al 10%) de rocas carbonatadas.
Resultados
La asociación se compone de siete especies pertenecientes a seis géneros (Hybodus plicatilis, Omanoselache bucheri comb. nov., Omanoselache contrarius comb. nov., Lonchidion derenzii, Lissodus aff. L. lepagei, Pseudodalatias henarejensis y cf. Rhomaleodus budurovi), la mayoría de ellos no neoseláceos. Los niveles donde aparecen los restos de condrictios datan del Ladiniense hasta el Carniense según las asociaciones de bivalvos, amonoideos y conodontos.
Conclusiones
Estos hallazgos son comparables, en términos taxonómicos, a la fauna de condrictios del Ladiniense de la Cordillera Ibérica que fue descrita recientemente, aunque éstos parecen ser menos abundantes en el Dominio Bético. Muchas de las especies encontradas aquí también aparecen en la cordillera Ibérica, con las excepciones de Lonchidion derenzii y cf Rhomaleodus budurovi que aparecen en la sección Boyar, datada como Carniense. El pequeño tamaño de los dientes recuperados, pertenecientes a individuos juveniles, sugieren que los ambientes epicontinentales someros registrados en las rocas del Triásico Medio-Superior del Dominio Bético podrían haber sido usadas como zonas de cría.
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Acknowledgements
We are thankful for the material supplied by Dr. Pablo Plasencia and the comments of the reviewers, which have improved the quality of the present paper. This work has been funded by the Spanish Government, Ministerio de Economía y Competitividad, Research Project CGL2014-52662-P and the FPI grant BES-2015-072618.
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Manzanares, E., Pla, C., Ferrón, H.G. et al. Middle-Late Triassic chondrichthyans remains from the Betic Range (Spain). J Iber Geol 44, 129–138 (2018). https://doi.org/10.1007/s41513-017-0027-1
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DOI: https://doi.org/10.1007/s41513-017-0027-1