First record of an Eomysticetidae from the El Cien Formation (late Oligocene), “Ten Minute” locality, Baja California Sur, Mexico;
Por:
Solís-Añorve A., González-Barba G., Buono M.R., Schwennicke T., Díaz-Cruz J.A.
Publicada:
1 ene 2024
Categoría:
Earth and planetary sciences (miscellaneous)
Resumen:
Eomysticetidae (Chaeomysticeti clade) is an archaic family of baleen whales that originated and diversified during the Oligocene epoch. The fossil record of this family is represented by at least 11 formally described species, including records in Baja California Sur (Mexico), Kaiserswerth (Germany), Kitakyushu (Japan), South Carolina (United States), and South Island (New Zealand). Baja California Sur (BCS) possesses important marine deposits from the upper Oligocene, which document a rich diversity of fossil mysticetes, including members of the family Eomysticetidae. In this work, we report a whale specimen collected in the upper Oligocene San Juan Member, El Cien Formation, from the so-called “Ten Minute locality”, San Hilario, about 100 km NW of La Paz, Baja California Sur. The studied specimen consists of an incomplete skull, in which most of the rostrum and part of the occipital shield are missing but preserving one tympanic bulla in situ. This specimen is identified as belonging to the family Eomysticetidae based on both an elongated skull and nasals and transversely narrow and long intertemporal region with a wide exposure of parietals and frontals. The lack of more diagnostic regions precludes its identification at generic/specific levels. The specimen represents the first description of an eomysticetid for the San Hilario area, increasing our knowledge of the evolution of this group of mysticetes and its record in the Pacific basin from the late Oligocene of BCS. © (2024), (Boletin de la Sociedad Geologica Mexicana). All Rights Reserved.
Filiaciones:
Posgrado de Ciencias Marinas y Costeras (CIMACO), Universidad Autónoma de Baja California Sur, Carretera al sur Km 5.5, apartado postal 19-B CP:, Baja California Sur, La Paz, 23080, Mexico
Museo de Historia Natural, Universidad Autónoma de Baja California Sur, Carretera al sur Km 5.5, apartado postal 19-B CP:, Baja California Sur, La Paz, 23080, Mexico
Instituto Patagónico de Geología y Paleontología, CCT CONICET-CENPAT, Bvd. Browm 2915, Provincia del Chubut, Puerto Madryn, U9120ACD, Argentina
Museo Paleontológico “Egidio Feruglio”, Av. Fontana 140, Chubut, Trelew, Argentina
Departamento Académico de Ciencias de la Tierra, Universidad Autónoma de Baja California Sur, Carretera al sur Km 5.5, apartado postal 19-B CP:, Baja California Sur, La Paz, 23080, Mexico
Colección Nacional de Peces, Departamento de Zoología, Instituto de Biología, Universidad Autónoma de México, Tercer Circuito Exteri- or S/N. CP, Mexico City, 045110, Mexico
gold
|