Crocodylomorph Tracks from the Late Jurassic of Asturias (Spain)

Avanzini, Marco; García-Ramos, José Carlos; Lires, José; Piñuela, Laura; Lockley, Martin G.

doi:10.1080/10420940601010943

Cited by 61 publications

(90 citation statements)

References 12 publications

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“…According to these authors, the footprints would be produced by the locomotion of the trackmaker through seminatation in shallow water, with the fingers touching the bottom while the body and tail floats. Footprints with a similar origin were described by Avanzini et al (2005) and Silva et al (2008), the latter describing an animal with the pes turned lateroposteriorly, which could be able to swim in a similar manner to mesosaurids. However, the collected data contradict the interpretation by Sedor & Silva (2004).…”

Section: Systematic Ichnologymentioning

confidence: 86%

Ichnotaxonomy, functional morphology and paleoenvironmental context of Mesosauridae tracks from Permian of Brazil

Silva

Sedor

Fernandes

2009

RBG

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Subaqueous vertebrate traces are fairly common in fossil record, but there are few studies on the theme due to the difficulties in classification and interpretation. In Brazil, subaqueous tracks were recorded in rocks of Irati Formation (Lower Permian, Paraná Basin). According to morphological features and interpretation, the ichnofossils were designated as a new ichnotaxon, Mesosaurichnium natans igen. nov. et isp. nov., and attributed to the activities of basal reptiles Mesosauridae. Based on faciology, the ichnofossils possibly were produced in a lower shoreface affected by storm waves and do not correspond to the original sedimentary surface, which was covered by a thin layer of crustacean shelly fragments during the production of the tracks. The tracks were produced by mesosaurids during the swimming next to the bottom with the long tail maintaining the propulsion. The mesosaurids were able to use the tail as the main propelling organ for fast swimming under undulatory propulsion, but with the paddle-like pedes acting as important accessory propellant during oscillatory propulsion, conferring greater maneuverability during slow swimming.Keywords: subaqueous traces, swimming, Mesosauridae, Permian, Paraná Basin.Resumo Icnotaxonomia, morfologia funcional e contexto paleoambiental de pegadas de Mesosauridae do Permiano do Brasil. Pegadas subaquáticas de vertebrados são relativamente comuns no registro fossilífero, mas há poucos estudos sobre o tema devido à dificuldade na classificação e interpretação. No Brasil, pegadas subaquáticas foram registradas na Formação Irati (Permiano Inferior, Bacia do Paraná). De acordo com características morfológicas e interpretação morfofuncional, os icnofósseis foram designados como um novo táxon, Mesosaurichnium natans igen. nov. et isp. nov., e atribuídos aos répteis basais da família Mesosauridae. Com base na faciologia, os icnofósseis foram produzidos na área de transição entre as zonas de supramaré e intermaré e não corresponderiam à superfície original, pois essa encontrava-se coberta por uma fina camada de fragmentos de carapaças de crustáceos na ocasião da formação das pegadas. Os mesossauríde-os teriam produzido essas pegadas durante a natação próxima ao fundo, tendo a cauda como principal órgão propulsor. Eles seriam capazes de utilizar a cauda como o principal órgão de propulsão para natação rápida sob propulsão ondulatória, mas com o pé em forma de nadadeira atuando como um importante propulsor acessório durante a propulsão oscilatória, conferindo maior capacidade de manobra durante a natação lenta.Palavras-chave: pegadas subaquáticas, natação, Mesosauridae, Permiano, Bacia do Paraná.

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Section: Systematic Ichnologymentioning

confidence: 86%

Ichnotaxonomy, functional morphology and paleoenvironmental context of Mesosauridae tracks from Permian of Brazil

Silva

Sedor

Fernandes

2009

RBG

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“…The crocodilian ichnogenus Crocodylopodus from the Early Cretaceous of Spain (Fuentes Vidarte and Meijide Calvo, 2001;Lockley and Meyer, 2004), is also characterized by five manual digit impressions with a much greater interdigital angulation and the marks of digits I and V are almost aligned. A similar feature is common in all the small fossil crocodilian footprints described up to now (Fuentes Vidarte and Meijide Calvo, 2001;Lockley and Meyer, 2004;Avanzini et al, 2007).…”

Section: Discussionmentioning

confidence: 75%

“…Most are of dinosaurs, but several sites include pterosaur, turtle and crocodilian tracks (García-Ramos et al, 2002;2006;Avanzini et al, 2005;.…”

Section: Introduction and Geological Settingmentioning

confidence: 99%

First report of a Late Jurassic lizard-like footprint (Asturias, Spain)

Avanzini¹,

Piñuela²,

García-Ramos³

2010

J. iber. geol.

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This report describes an isolated footprint preserved as a natural cast (convex hyporelief) from the Lastres Fm. (Late Jurassic) of northern Spain. The track consists of a small isolated pentadactyl ectaxonic right manus footprint. It is very asymmetric, plantigrade, with digits and palm deeply marked on the substrate. Digit IV is the longest, digits II and I are nearly equal in length and only a little shorter than III and IV. The footprint morphology is typical of a lizard -like or "lacertoid" track .The general outline of the footprint, the width to length ratio approximately equal to 1, the marked plantigrady and the substantial similarity in length of digits IV-I are coherent with a Rhynchosauroidea manual print. The global record of Rhynchosauroides ichnogenus shows that this specimen represents the latest occurrence of the ichnogenus. The most probable trackmaker was possibly a rhyncocephalian reptile.Keywords: Upper Jurassic, "Lacertilian" tracks, Rhynchosauroides, Asturias, Spain ResumenSe describe una huella de mano aislada, preservada como contramolde natural (hiporrelieve convexo) de la Formación Lastres (Jurásico Superior) del N de España. La icnita, aislada, pentadáctila, ectaxónica y de pequeño tamaño, es atribuida a una mano de-ISSN (print): 1698-6180. ISSN (online): 1886-7995

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“…Lo mismo sucede en la Península Ibérica, aquí se han encontrado: en Asturias (Fm. Lastres, Jurásico Superior; Avanzini et al, 2005, Lockley et al, 2008 y en Cameros.…”

Section: Introductionunclassified

Las huellas de tortuga del Grupo Oncala (Berriasiense, Cuenca de Cameros, España)

Pascual-Arribas¹,

Hernández-Medrano²

2015

Estud. geol.

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Crocodylomorph Tracks from the Late Jurassic of Asturias (Spain)

Cited by 61 publications

References 12 publications

Ichnotaxonomy, functional morphology and paleoenvironmental context of Mesosauridae tracks from Permian of Brazil

Ichnotaxonomy, functional morphology and paleoenvironmental context of Mesosauridae tracks from Permian of Brazil

First report of a Late Jurassic lizard-like footprint (Asturias, Spain)

Las huellas de tortuga del Grupo Oncala (Berriasiense, Cuenca de Cameros, España)

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