globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2016.11.009
论文题名:
A new tetrapod ichnotaxon from Botucatu Formation, Lower Cretaceous (Neocomian), Brazil, with comments on fossil track preservation on inclined planes and local paleoecology
作者: Buck P.V.; Ghilardi A.M.; de C. P. e M. Peixoto B.; Fernandes L.B.D.R.; Fernandes M.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 466
起始页码: 21
结束页码: 37
语种: 英语
英文关键词: Brasilichnium saltatorium isp. nov. ; Ichnofossil ; Mammaliform footprints ; Paleodesert ; Paraná Basin ; Saltatorial locomotion
英文摘要: Botucatu Formation is a paleoerg, worldwide famous for its vertebrate and invertebrate ichnofossils. Among Botucatu Formation tetrapod tracks, ichnogenus Brasilichnium Leonardi, 1981 is well known, being generally attributed to mammaliform trackmakers. In this study a new ichnotaxon is described, Brasilichnium saltatorium isp. nov., characterized by a hopping locomotion in phases. The new ichnotaxon differs from B. elusivum Leonardi, 1981 mainly for the locomotion pattern. It also differs from other ichnotaxa by indicating hopping progression regarding limb morphology and track configuration. Fossil evidence shows B. saltatorium and B. elusivum could be produced by the same organism and represent an alternation in locomotory behavior. Neoichnological experiments were conducted to better understand track preservation and aspects of saltatorial dynamics on inclined planes. It was observed differences in heteropody degree may be related to movement direction and locomotion effort on ascending or descending the incluned plane. Due to extramorphological features, heteropody is more evident when the producer climbs the simulated dune. Also, when the movement is ascendent, lack of handprints can occur. This can be explained by total overlap of pes and manus impression and subsurface hand impression. Comparing with recent organisms living in similar environments and conditions, the Botucatu Formation B. saltatorium producer should have been a generalist organism likely with an omnivorous habit. It may have adopted hopping locomotion to gain velocity when hunting, escaping predators, or to facilitate progression on inclined planes and hot sand. São Bento quarry represents a paleodesert environment with relative high humidity, where temporary lagoons may have formed during pluvial events. Paleo-rain episode evidence is preserved through raindrops impact craters on local sandstone. São Bento quarry paleoenvironment sustained a rich paleofauna, represented by abundant ichnofossils. This local diversity suggests a punctual productive desert paleocommunity with several paleoecological interactions, where Brasilichnium producer was one of the fundamental elements. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68038
Appears in Collections:过去全球变化的重建

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作者单位: Programa de Pós Graduação em Ecologia e Recursos Naturais, Centro de Ciências Biológicas e da Saúde, UFSCar, Rodovia Washington Luís, km 235 - SP-310, São Carlos, São Paulo, Brazil; Universidade Federal de Pernambuco, campus Vitória de Santo AntãoPernambuco, Brazil; Laboratório de Paleoecologia e Paleoicnologia, Departamento de Ecologia e Biologia Evolutiva, Universidade Federal de São Carlos, Rodovia Washington Luís, km 235 - SP-310, São Carlos, São Paulo, Brazil

Recommended Citation:
Buck P.V.,Ghilardi A.M.,de C. P. e M. Peixoto B.,et al. A new tetrapod ichnotaxon from Botucatu Formation, Lower Cretaceous (Neocomian), Brazil, with comments on fossil track preservation on inclined planes and local paleoecology[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,466
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