Primeiro registro de pegadas de Mesosauridae (Amniota, Sauropsida) na Formação Irati (Permiano superior da bacia do Paraná) do Estado de Goiás, Brasil

Sedor, Fernando Antonio

doi:10.4072/rbp.2004.2.21

Cited by 15 publications

(20 citation statements)

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“…McAllister & Kirby (1998) and McAllister (1989) established characters to recognize subaqueous footprints, many of them found in the studied samples: reflecture of digits, depth of the mark corresponding to the arc of digit, elongation of traces, posterior overhang, impression of distal digits, trace lengths excessively variable compared to widths and unexpected configurations. The occurrence of these characters together with the paleoenvironmental interpretation for these rocks confirms the hypothesis of an underwater origin as suggested by Sedor & Silva (2004). 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.…”

Section: Systematic Ichnologysupporting

confidence: 59%

“…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). The beds with ichnofossils were deposited under few meters deep (Lavina 1991, Santos Neto 1993 and its production only could be possible during swimming with the complete submersion of the trackmaker.…”

Section: Systematic Ichnologycontrasting

confidence: 47%

“…Yet following McAllister & Kirby (1998), the wider portion of subaqueous footprints corresponds to the posterior extremity, contrasting with the interpretation by Sedor & Silva (2004) 3 and 4) with a highly curved, comma-shaped extremity. This feature can be interpreted as reflecture of digits, produced during the final stage of propelling by the feet (Thulborn & Wade 1989).…”

Section: Systematic Ichnologymentioning

confidence: 57%

“…nov. can be attributed to a aquatic swimming tetrapod which lived in the environment represented today by the Irati Formation. In a preliminary work by Sedor & Silva (2004), these footprints were attributed to Mesosauridae, the only tetrapods known in Irati Formation. The Mesosauridae family are composed by three species, Mesosaurus tenuidens Gervais 1864, Stereosternum tumidum Cope 1886 and Brazilosaurus sanpauloensis Shikama and Ozaki 1966.…”

Section: Systematic Ichnologymentioning

confidence: 99%

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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 Ichnologysupporting

confidence: 59%

Section: Systematic Ichnologycontrasting

confidence: 47%

Section: Systematic Ichnologymentioning

confidence: 57%

Section: Systematic Ichnologymentioning

confidence: 99%

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

Silva

Sedor

Fernandes

2009

RBG

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“…Although Sedor and Silva (2004) had interpreted the traces as half-swimming prints, they were subsequently interpreted as being produced as the animal plunged several meters deep based mainly on faciology (Lavina, 1991;Santos Neto, 1993;Silva et al, 2009). The absence of traction prints also supports this hypothesis, since their occurrence along with drag marks is typical of half-swimming traces (Silva et al, 2007(Silva et al, , 2008(Silva et al, , 2009Romano and Whyte, 2010).…”

Section: The Mesosauridae Tracesmentioning

confidence: 99%

Mesosaurid Swim Traces

Silva

Sedor

2017

Front. Ecol. Evol.

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Despite subaqueous fossils tracks of tetrapods being quite common in the fossil record, few studies discuss their classification and morphofunctional interpretation. Even with their simple morphology, some important information about the trackmakers can be retrieved from these tracks. Subaqueous traces were found in Brazil in the Irati Formation (Cisuralian, Permian), Paraná Basin, and described as Mesosaurichnium natans, related to Mesosauridae. The traces were produced in a shallow marine environment, whose substrate contained crustacean shells forming a thin layer. The mesosaurids produced the traces by swimming close to the bottom. The propulsion was provided by undulatory moves of the long tail, mainly for faster swimming. The feet could act as accessory and slower propellants, but provided more maneuverability.

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New rhadinosuchine proterochampsids from the late Middle‐early Late Triassic of southern Brazil enhance the diversity of archosauriforms

Paes‐Neto,

Lacerda,

Ezcurra

et al. 2023

The Anatomical Record

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Proterochampsidae is a clade of non‐archosaurian archosauriforms restricted to the Middle to the Late Triassic of the Ischigualasto‐Villa Unión Basin of Argentina and the Santa Maria Supersequence of Brazil. A reappraisal of proterochampsid specimens from the Brazilian Dinodontosaurus Assemblage Zone (AZ) of the Pinheiros‐Chiniquá Sequence (late Ladinian‐early Carnian) is presented here. One of the specimens was preliminary assigned to Chanaresuchus sp., whose type species comes from the Massetognathus‐Chanaresuchus AZ of the Chañares Formation of Argentina. However, our revision indicates that it differs from Chanaresuchus, being more closely related to the middle‐late Carnian Rhadinosuchus gracilis. We therefore propose the new taxon, Pinheirochampsa rodriguesi, to reallocate this specimen. Additionally, we present a revision of other putative Chanaresuchus occurrences in Brazil, including the only known specimen described for the Santacruzodon AZ (Santa Cruz do Sul Sequence; early Carnian), also proposing it as a new taxon: Kuruxuchampsa dornellesi. Both new species are characterized, among other features, by transverse expansion of the anterior end of the rostrum, similar to the condition present in Rhadinosuchus, but absent in Chanaresuchus, Gualosuchus, Pseudochampsa, and non‐rhadinosuchine proterochampsids. These two new species expand the growing knowledge of the non‐archosaurian archosauriform diversity during the Middle‐Late Triassic in South America and enhance faunal and chronological comparisons between approximately coeval geological units between Argentina and Brazil.

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Primeiro registro de pegadas de Mesosauridae (Amniota, Sauropsida) na Formação Irati (Permiano superior da bacia do Paraná) do Estado de Goiás, Brasil

Cited by 15 publications

References 1 publication

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

Mesosaurid Swim Traces

New rhadinosuchine proterochampsids from the late Middle‐early Late Triassic of southern Brazil enhance the diversity of archosauriforms

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