New plesiosaur records from the Lower Cretaceous of the Neuquén Basin, west-central Argentina, with an updated picture of occurrences and facies relationships

O'gorman, Jose Patricio; Lazo, Darío G.; Luci, Leticia; Cataldo, Cecilia S.; Schwarz, Ernesto; Lescano, Marina; Aguirre-Urreta, Marı́a B.

doi:10.1016/j.cretres.2015.04.004

Cited by 14 publications

(9 citation statements)

References 55 publications

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“…14A ), however, the relationships between different taxa other than styxosaurines and aristonectines are still unclear. Interestingly, the oldest plesiosaurian records with ‘ Cimoliasaurus ’-grade cervical vertebrae are mostly restricted to the Southern Hemisphere during the Lower Cretaceous ( Kear, 2002 ; Lazo & Cichowolski, 2003 ; O’Gorman et al, 2015a ), with one known exception in the upper Hauterivian of Germany ( Sachs et al, 2015 ). This reached an sub-equatorial distribution during the ‘middle’ Cretaceous ( Welles, 1962 ; Carpenter, 1999 ) and acquired a worldwide distribution during the Late Cretaceous ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Along the south Pacific realm, elasmosaurids with the latter cervical morphotype are well represented by several informative enough specimens: CM Zfr 115 from the upper Campanian of New Zealand ( Hiller et al, 2005 ) and SGO.PV.6506 from the upper Maastrichtian of central Chile ( Otero et al, 2014a ). Specimens with ‘ Cimoliasaurus ’-grade cervical vertebrae are also known in Antarctica, represented by Vegasaurus molyi from the lower Maastrichtian of Vega Island ( O’Gorman et al, 2015a ). Additional elasmosaurids with the same cervical morphotype also occur in the south Atlantic, represented by SGO.PV.6558 from the upper Maastrichtian of the Magallanes Basin ( Otero et al, 2015a ), and by MCS PV 4 from the upper Campanian-lower Maastrichtian of Argentinean Patagonia ( Gasparini, Salgado & Parras, 2007 ).…”

Section: Discussionmentioning

confidence: 99%

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Taxonomic reassessment ofHydralmosaurusasStyxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous

Otero

2016

PeerJ

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Two extremely-long necked elasmosaurids, AMNH 1495, holotype of Hydralmosaurus serpentinus, and AMNH 5835, previously referred to H. serpentinus, are here reviewed in detail. Unique features of the cervical vertebrae, which are only present on elasmosaurids from the Western Interior Seaway, are recognized based on these specimens and by comparison with penecontemporaneous taxa with biogeographic affinities. Phylogenetic analysis, bivariate graphic analysis of cervical vertebrae proportions, comparisons of different cervical vertebral types, paleobiogeographic distribution and study of the elasmosaurid axial evolution throughout the Cretaceous are here integrated. As a result, at least two separate lineages within the Elasmosauridae are identified by independently acquired extremely-long necks (over 60 cervical vertebrae). First, a still scarcely known lineage is so far represented by the lower Cenomanian Thalassomedon haningtoni, the Turonian Libonectes morgani and close relatives. A second lineage is here defined as a new clade, the Styxosaurinae, which groups the Campanian genera Terminonatator, Styxosaurus (=‘Hydralmosaurus’), Albertonectes and Elasmosaurus, the two latter forming a derived branch that includes the most extreme amniote necks known to date (more than 70 cervical vertebrae). Phylogenetic analysis supports AMNH 1495 and AMNH 5835 as being closely related to Styxosaurus snowii. Therefore, the species Styxosaurus browni is re-validated, while AMNH 1495 is here referred to Styxosaurus sp. This research also recognizes the ‘Cimoliasauridae’ (nomen dubium) as a paraphyletic group but informative of a plesiomorphic cervical vertebral morphology of elasmosaurids which was persistent throughout the whole Cretaceous and from whom aristonectines, styxosaurines and Thalassomedon and close relatives are derived. The genus Hydralmosaurus is recommended for being abandoned.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Taxonomic reassessment ofHydralmosaurusasStyxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous

Otero

2016

PeerJ

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“…Los moluscos fósiles mencionados, corresponden a diferentes tipos de pelecípodos y otros moluscos, posiblemente amonites, que son frecuentes en el Miembro Pilmatué de la Formación Agrio del Valanginiano tardío-Hauteriviano temprano que aflora ampliamente en las proximidades de la antigua mina Tilhué, a lo largo de la ribera norte del río Neuquén. La cadera a la que hace referencia es muy probable que perteneciera a un plesiosaurio, reptil marino que ha sido reconocido en esta unidad en otras localidades del Neuquén (O'Gorman et al, 2015).…”

Section: Figuraunclassified

Los primeros registros geológicos y paleontológicos del Neuquén: la expedición de Luis de la Cruz y Goyeneche en 1806

Aguirre-Urreta

Ramos

2016

RMLP

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Luis de la Cruz y Goyeneche realizó en 1806 un viaje de reconocimiento comisionado por las autoridades de Chile y del Virreinato del Río de la Plata. A principios del siglo XIX se propiciaba la búsqueda de un camino más directo entre Buenos Aires y el centro-sur de Chile, con la finalidad de mejorar la actividad comercial, atravesando territorios desconocidos y habitados por los indios. Aquí se analiza el recorrido en el territorio de la actual provincia del Neuquén a la que ingresó por el paso Pichachén, también conocido como boquete de Antuco, y siguió el curso del río Reñileuvú por su margen sur hasta su desembocadura en el río Neuquén. Luego se dirigió hacia el sur, recorriendo Treuco, pasando por el cerro Caicayén y por Truquicó para llegar a la unión de los ríos Curi Leuvú y Neuquén. Siguió viaje hacia Auquinco y desde allí atravesó la vega de Tril, con rumbo norte hasta Coboleuvú. A lo largo del camino describió diferentes litologías y en varias localidades hizo referencia a diversos tipos de moluscos petrificados, así como también a troncos y restos fósiles de grandes vertebrados. Estas precisas observaciones corresponden a los primeros registros geológicos y paleontológicos del Neuquén, lo que modifica algunas afirmaciones previas en la literatura geológica de la cuenca Neuquina y remonta por muchos años hallazgos fosilíferos de esta región de lo que hoy es la Argentina, en aquellas épocas aún parte del Virreinato del Río de La Plata.

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“…Undoubtedly, the Agrio Formation corresponds to one of the most complete Lower JurassiceLower Cretaceous marine faunal successions of the Southern Hemisphere. The rich and abundant fossil record, first described in detail by Weaver (1931), is composed mainly of invertebrates (bivalves, gastropods, nautiloids, ammonites, corals, crustaceans, echinoderms, bryozoans, and serpulids), diverse trace-fossil assemblages, and scarce vertebrate remains including, up to date, ichthyosaurs (Cichowolski and Lazo, 2000), elasmosaurid plesiosaurs (Lazo and Cichowolski, 2003;O'Gorman et al, 2015), and pycnodontiform fishes (Bocchino, 1977;Cione and Pereira, 1990;Lazo et al, 2005). The fauna as a whole has mainly Tethyan affinities, but some taxa have Andean affinities and even endemic taxa are present (Aguirre-Urreta et al, 2008b).…”

Section: The Neuqu En Basin and Agrio Formationmentioning

confidence: 99%

First record of elasmobranchs from the Lower Cretaceous of Argentina (Neuquén Basin)

Gouiric-Cavalli

Cione

Lazo

et al. 2018

Cretaceous Research

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The material reported herein comes from the Lower Cretaceous Agrio Formation (Neuqu en Basin, westcentral Argentina). These fishes dwelled in a Pacific Ocean embayment in southwestern Gondwana before the establishment of the Andean Cordillera. The material consists of an incomplete dorsal fin spine of the widespread Hybodontoidea clade (from upper Valanginian beds) and a partial tooth of one of the earliest known lamniforms (from upper Hauterivian beds).

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New plesiosaur records from the Lower Cretaceous of the Neuquén Basin, west-central Argentina, with an updated picture of occurrences and facies relationships

Cited by 14 publications

References 55 publications

Taxonomic reassessment ofHydralmosaurusasStyxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous

Taxonomic reassessment ofHydralmosaurusasStyxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous

Los primeros registros geológicos y paleontológicos del Neuquén: la expedición de Luis de la Cruz y Goyeneche en 1806

First record of elasmobranchs from the Lower Cretaceous of Argentina (Neuquén Basin)

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