Differentiation of tetrapod communities and some aspects of biotic events in the early triassic of Eastern Europe

Shishkin, M. A.; Сенников, А. Г.; Новиков, И. В.; Ilyina, N. V.

doi:10.1134/s0031030106010011

Cited by 28 publications

(17 citation statements)

References 10 publications

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“…This biogeographic hypothesis was already established by several authors and largely documented by taxonomical similarities found between Russian and South African therapsids (Ochev & Shishkin, 1989;Milner, 1990;Warren, 1999, Yates & Warren, 2000Battail, 2000;Sidor et al, 2005;Surkov et al, 2005;Smith et al, 2006;Shishkin et al, 2006).…”

Section: P R O V a Smentioning

confidence: 71%

Temnospondyl diversity of the Permian-Triassic Colonia Orozco Local Fauna (Buena Vista Formation) of Uruguay

Piñero¹

2007

RBP

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Section: P R O V a Smentioning

confidence: 71%

Temnospondyl diversity of the Permian-Triassic Colonia Orozco Local Fauna (Buena Vista Formation) of Uruguay

Piñero¹

2007

RBP

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“…The order of first occurrence dates is based on Golubev (2000 a ), Novikov et al. (2000), Shishkin et al. (2006), Witzmann et al.…”

Section: Methodsmentioning

confidence: 99%

“…The migration patterns of Triassic chroniosuchians have been taken into account by Shishkin et al. (2006) who found that wide‐armoured bystrowianids spread from the southern to the northern Pre‐Urals during the late Early Triassic and by Witzmann et al.…”

Section: Research History Of the Chroniosuchiamentioning

confidence: 99%

On the use of osteoderm features in a phylogenetic approach on the internal relationships of the Chroniosuchia (Tetrapoda: Reptiliomorpha)

Buchwitz

Foth²,

Kogan

et al. 2012

Palaeontology

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Chroniosuchians are an enigmatic Permian to Triassic group of crocodile-like basal tetrapods. Their conspicuous dorsal osteoderm systems include most of the group's yet documented postcranial morphological variability but have hardly been considered in cladistic approaches. Aiming at the clarification of the internal relationships of the Chroniosuchia, we have carried out a parsimony analysis including, among others, 23 morphological and osteohistological osteoderm characters and 12 chroniosuchian taxa. According to the most parsimonious trees, taxa usually referred to Chroniosuchidae form a paraphyletic succession with Madygenerpeton pustulatus and Chroniosaurus dongusensis as the basalmost chroniosuchians and Uralerpeton tverdochlebovae as the sister group of Bystrowianidae (hypothesis A). However, the concurrent hypothesis of a basal split into monophyletic subtaxa Chroniosuchidae and Bystrowianidae (hypothesis B) is only slightly less parsimonious and supported by an alternative analysis which includes embolomeres as the only reptiliomorph outgroup.Searching for the better hypothesis, we compare the respective order of branching to the order of first occurrences in the fossil record, demonstrating that hypothesis A provides a better stratigraphic fit than hypothesis B. Accordingly, the last common ancestor of the yet known chroniosuchians had a series of broad complexly interlocking 'chroniosuchid' osteoderms that served as a protection carapace apart from supporting the trunk during terrestrial locomotion. The later evolution of chroniosuchian carapaces was marked by a stepwise increase in flexibility and size reduction, which resulted in a loss of protective function and in a reduction in trunk support function. The flexibility increase is paralleled by the evolution of the Crocodylomorpha whose extant members do not possess as extensively interlocking osteoderm systems as some of their Mesozoic relatives.

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“…; Shishkin et al . ; Shcherbakov ; Krassilov & Karasev ). The Vyazniki locality is one of the most fossil‐abundant areas from this time interval.…”

mentioning

confidence: 98%

Microbiota and food residues including possible evidence of pre-mammalian hair in Upper Permian coprolites from Russia

Bajdek¹,

Qvarnström

Owocki

et al. 2016

LET

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Coprolites (fossil faeces) provide direct evidence on the diet of its producer and unique insights on ancient food webs and ecosystems. We describe the contents of seven coprolites, collected from the Late Permian Vyazniki site of the European part of Russia. Two coprolite morphotypes (A, B) contain remains of putative bacteria, cyanobacteria, fungi, protists, invertebrate eggs, arthropod elements, undigested bone and tooth fragments, fish scales and elongated hair-like structures with hollow interiors. Content, size and shape of the coprolites together with the associated body fossil record suggest that the most probable scat-producers were carnivorous tetrapods; the bone-rich morphotype A reveals short food retention time and a fast metabolism and is therefore assigned to therapsid carnivores whereas morphotype B with rarer and degraded bones are assigned to archosauromorphs or other non-therapsid carnivores. The general coprolite matrix contains abundant micron-sized spheres and thin-walled vesicles which are interpreted as oxide and phosphatic pseudomorphs after microbial cells. From analyses of the undigested bones, we infer that they represent remains of actinopterygian fish, a therapsid and unrecognizable parts of amphibians and/or reptiles. Additionally, hair-like structures found in one coprolite specimen occur as diagenetically altered (oxide-replaced) structures and moulds (or partly as pseudomorphs) in a microcrystalline carbonate-fluoride-bearing calcium phosphate. This suggests that the latest Permian therapsids probably were equipped with hair-like integument or hairsuit. If true, this is by far the oldest evidence of this mammalian character in the stem group of mammals. □ Coprolites, food residues, hair-like structures, Late Permian, microbial structures. Piotr Bajdek [piotr.bajdek@gmail.com], Aleja Naj swie z tszej Maryi Panny 20/20A 42-200 Cze z stochowa, Poland; Martin Qvarnstr€ om [martin.qvarnstrom@ebc.uu.se], Grzegorz Nied zwiedzki [grzegorz.niedzwiedzki@ebc.uu.se],

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Differentiation of tetrapod communities and some aspects of biotic events in the early triassic of Eastern Europe

Cited by 28 publications

References 10 publications

Temnospondyl diversity of the Permian-Triassic Colonia Orozco Local Fauna (Buena Vista Formation) of Uruguay

Temnospondyl diversity of the Permian-Triassic Colonia Orozco Local Fauna (Buena Vista Formation) of Uruguay

On the use of osteoderm features in a phylogenetic approach on the internal relationships of the Chroniosuchia (Tetrapoda: Reptiliomorpha)

Microbiota and food residues including possible evidence of pre-mammalian hair in Upper Permian coprolites from Russia

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