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Post by arctozilla on Oct 31, 2022 16:39:56 GMT -5
On the morphology of the astragalus and calcaneus of the amphicyonids (Carnivora, Mammalia) from the Paleogene of Europe: implications for the ecology of the European bear-dogs Abstract The Paleogene mammals of Europe are rarely known from partial or complete skeletons. As a result, their systematics and ecology are often solely based on dental characters and postcranial remains, when available, are usually neglected. This explains why the locomotion of mammals of the Eocene-Oligocene transition, the “Grande Coupure”, is poorly known. The aim of this study is to describe the tarsal bones (astragali and calcanei) and characterize the locomotion of amphicyonid carnivorans, one of the most abundant mammalian predator groups from the Phosphorites du Quercy (France) sites. The identification of taxa and the characterization of both posture and locomotion were carried out using four criteria: relative abundance (in comparison with dental data), morphology, size, and body mass. Seven morphotypes, four among astragali and three among calcanei, are identified as Amphicyonidae and show various postures: plantigrade, semi-digitigrade, and digitigrade. One morphotype of the astragalus and one of the calcaneus are identified as Cynodictis lacustrisGervais, 1852, which exhibits a digitigrade posture. The study of postcranial bones, such as tarsals, allows for a better understanding of the ecology of these animals and deserves more interest in future morphological and phylogenetic studies. bioone.org/journals/geodiversitas/volume-42/issue-18/geodiversitas2020v42a18/On-the-morphology-of-the-astragalus-and-calcaneus-of-the/10.5252/geodiversitas2020v42a18.shortInviato dal mio 21061119DG utilizzando Tapatalk
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Post by arctozilla on Oct 31, 2022 16:54:19 GMT -5
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Post by brobear on Feb 12, 2023 5:14:01 GMT -5
Amphicyonidae (bear dogs)
1- Agnotherium antiquus. 2- Agnotherium grivense. 3- Amphicyon frendens. 4- Amphicyon bohemicus. 5- Amphicyon castellanus. 6- Amphicyon caucasicus. 7- Amphicyon galushai. 8- Amphicyon giganteus. 9- Amphicyon ingens. 10- Amphicyon intermedius. 11- Amphicyon laugnacensis. 12- Amphicyon longiramus. 13- Amphicyon major. 14- Amphicyon pontoni. 15- Amphicyon reinheimeri. 16- Amphicyon riggsi. 17- Amphicyon tairumensis. 18- Amphicyon ulungurensis. 19- Amphicyonopsis serus. 20- Brachycyon reyi. 21- Brachycyon palaeolycos. 22- Brachycyon gaudryi. 23- Cynelos caroniavorus. 24- Cynelos crassidens. 25- Cynelos helbingo. 26- Cynelos idoneus. 27- Cynelos jourdan. 28- Cynelos lemanensis. 29- Cynelos pivetaui. 30- Cynelos rugosidens. 31- Cynelos schlosseri. 32- Cynelos sinapius. 33- Cynodictis lacustris. 34- Euroamphicyon olisiponensis. 35- Gobicyon macrognathus. 36- Gobicyon zhegalloi. 37- Guangxicyon sinoamericanus. 38- Haplocyon elegans. 39- Haplocyon crucians. 40- Haplocyonoides mordax. 41- Haplocyonoides serbiae. 42- Haplocyonoides ponticus. 43- Ischyrocyon gidleyi. 44- Paradaphoenus cuspigerus. 45- Paradaphoenus minimus. 46- Paradaphoenus tooheyi. 47- Pliocyon medius. 48- Pliocyon robustus. 49- Pseudarctos bavaricus. 50- Pseudamphicyon bavaricus. 51- Pseudocyon sansaniensis. 52- Pseudocyon steinheimensis. 53- Pseudocyon styriacus. 54- Pseudocyonopsis ambiguus. 55- Pseudocyonopsis antiquus. 56- Pseudocyonopsis quercensis. 57- Ysengrinia americanus. 58- Ysengrinia depereti. 59- Ysengrinia geraniana. 60- Ysengrinia ginsburg. 61- Ysengrinia tolosan.
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Post by arctozilla on May 14, 2023 12:55:42 GMT -5
Three New Ichnogenera of Biting and Gnawing Traces on Reptilian and Mammalian Bones: A Case Study from the Miocene of the Czech Republic Radek Mikuláš,Eva Kadlecová,Oldřich Fejfar &Zdeněk Dvořák Abstract The Ahníkov (Miocene, Czech Republic) site represents a concentration of vertebrate skeletal remains in a swamp setting. Autochthonous bone deposits were strongly altered by sedimentary processes and early diagenesis. Biting and gnawing traces recognized on hard animal tissues (bones, teeth, antlers, turtle thoraces) represent seven recurring morphotypes. The following ichnotaxa are erected: Nihilichnus nihilicus n. igen. et n. isp., Nihilichnus mortalis n. isp., Machichnus regularis n. igen. et n. isp., Machichnus multilineatus n. isp., Machichnus bohemicus n. isp., and Brutalichnus brutalis n. igen. et n. isp. Each kind of bones or similar substrates bears a specific proportion of various bite traces but no observed morphotype is specific for a single substrate. Ethologically, traces of sharpening of teeth are principally different from predation traces. The beavers Steneofiber eseri and Steneofiber depereti, the carnivore Amphicyon sp. and the crocodiles are presumed as the tracemakers. www.tandfonline.com/doi/abs/10.1080/10420940600850729Inviato dal mio 21061119DG utilizzando Tapatalk
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