Myobradypterygius

Myobradypterygius
Temporal range: Early Cretaceous,
~145–125 Ma
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: †Ichthyosauria
Family: †Ophthalmosauridae
Genus: †Myobradypterygius
von Huene, 1927
Type species
†Myobradypterygius hauthali
von Huene, 1927
Synonyms

Myobradypterygius is an extinct genus of ophthalmosaurid ichthyosaur from the Early Cretaceous (Barremian-Hauterivian) of Argentina[1] and possibly also Chile.[2] One species is known, M. hauthali,[3] which was once believed to have been a species of Platypterygius.[4]

Discovery and naming

The holotype, MLP 79-I-30-2, a vertebral column and associated forelimbs, was discovered between 1900 and 1925 by Rudolph Hauthal at Nevado de Famatina, Argentina.[1] The specimen was first described by von Huene (1925) and he reconstructed the forelimb, and described it as being related to Myopterygius (now Pervushovisaurus).[5]

A second specimen, MLP 79-I-30-1, which included a left humerus and a forefin, was described by von Huene (1927) and in the same paper, both specimens were believed to belong to the same species, which was named Myobradypoterygius hauthali.[3]

A second species, M. mollensis, was named by Carlos Rusconi (1938) on the basis of specimen MHN-PV 106, a set of vertebrae found in the Los Molles Formation of Argentina,[6] but it has since been synonymised with Platypterygius and was not mentioned in the 2024 reappraisal of the genus.

McGowan (1972) synonymised M. hauthali with Platypterygius and created the new name Platypterygius hauthali.[4]

Stinnesbeck et al. (2014) described around forty ichthyosaur specimens from the Zapata Formation of Chile,[2] several of which had previously been assigned to Platypterygius,[7] and assigned several of the specimens to what would later become Myobradyopterygius hauthali.[8]

Fernández and Aguirre-Urreta (2005) reviewed the holotype and were the first to determine that it did not belong to Platypterygius.[9] Campos et al. (2024) reinstated the genus Myobradyopterygius as separate from Platypterygius.[1]

Classification

In 1925, Myobrachyopterygius was classified as being similar to Perushovisaurus.[5] In 1972, it was allied with Platypterygius,[4] and in 2024, Myobrachyopterygius was classified within Ophthalmosauridae.[1]

References

  1. ^ a b c d Campos, L.; Fernández, M. S.; Bosio, V.; Herrera, Y.; Manzo, A. (2024). "Revalidation of Myobradypterygius hauthali Huene, 1927 and the phylogenetic signal within the ophthalmosaurid (Ichthyosauria) forefins". Cretaceous Research. 157. 105818. Bibcode:2024CrRes.15705818C. doi:10.1016/j.cretres.2023.105818.
  2. ^ a b Stinnesbeck, W.; Frey, E.; Rivas, L.; Perez, J. P.; Cartes, M. L.; Soto, C. S.; Lobos, P. Z. (2014-05-22). "A Lower Cretaceous ichthyosaur graveyard in deep marine slope channel deposits at Torres del Paine National Park, southern Chile". Geological Society of America Bulletin. 126 (9–10): 1317–1339. Bibcode:2014GSAB..126.1317S. doi:10.1130/b30964.1. ISSN 0016-7606.
  3. ^ a b Huene, F. von. (1927). Beitrag zur Kenntnis mariner mesozoischer Wirbeltiere in Argentinien. Centralblatt für Mineralogie, Geologie und Paläontologie, B 1927:22-29.
  4. ^ a b c McGowan, C. (1972). The systematics of Cretaceous ichthyosaurs with particuliar reference to the material from North America. Contributions to Geology. 1972;11:9–29.
  5. ^ a b Huene, F. von. (1925). Ichthyosaurier aus der Kreide Argentiniens. Revista del Museo de La Plata 28:234-238.
  6. ^ C. Rusconi. (1938). Restos de ictiosaurios del Jurásico Superior de Mendoza [Remains of ichthyosaurs from the Upper Jurassic of Mendoza]. Boletin Paleontológico de Buenos Aires 10:1-4
  7. ^ SHULTZ, M. R.; FILDANI, A.; SUAREZ, M. (2003-02-01). "Occurrence of the Southernmost South American Ichthyosaur (Middle Jurassic--Lower Cretaceous), Parque Nacional Torres del Paine, Patagonia, Southernmost Chile". PALAIOS. 18 (1): 69–73. Bibcode:2003Palai..18...69S. doi:10.1669/0883-1351(2003)018<0069:ootssa>2.0.co;2. ISSN 0883-1351.
  8. ^ Páramo Fonseca, María Eurídice (2018), "Restos apendiculares de un ictiosaurio oftalmosáurido del Barremiano inferior de Villa de Leiva, Colombia", Boletín de Geología, 40: 15–30, doi:10.18273/revbol.v40n1-2018001, retrieved 2019-02-06
  9. ^ Fernändez, Marta; Aguirre-Urreta, M. Beatriz (2005-09-30). "Revision of Platypterygius hauthali von Huene, 1927 (Ichthyosauria: Ophthalmosauridae) from the Early Cretaceous of Patagonia, Argentina". Journal of Vertebrate Paleontology. 25 (3): 583–587. doi:10.1671/0272-4634(2005)025[0583:rophvh]2.0.co;2. hdl:11336/93640. ISSN 0272-4634.