Crocodilos miocênicos de grande tamanho do oeste Europeu

Predação, analogias com “Falsos Gaviais” e Tamanho

Translated title of the contribution: Huge miocene crocodilians from western Europe: Predation, comparisons with the “false gharial” and size

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

As shown here on the basis of bitten teeth, the diet of the huge, lower to early upper Miocene Tomistoma lusitanica included some of the largest contemporaneous, terrestrial mammals, including adult or senile gomphotheres (Gomphotherium angustidens). One of the latter would be, in a rough estimate, about 50 years old at death. Bite impressions are discussed, including marks resulting from impact, intense attrition and eventual crushing. The teeth of very large-sized tomistomines would have a not restricted to prehension role, they also acted as true cone devices for crushing hard parts. Crushing - non-tectonic effects - have also been observed on a suid fossil. The so far obtained results may point out that the very basic reason of the extant false-gharial, Tomistoma schlegelii’s prevailing ichthyophagy may be human pressure that prevents them to attain their possible maximum size, and hence to capture larger prey. The importance of immigration from Asia and biogeographic affinities is stressed. This seems obvious after the simultaneous presence of Tomistoma and Gavialis in westernmost Eurasia. Different data from North Africa do not contradict these views. Extrapolations based on the Miocene false-gharials contribute to a better understanding of the surviving species. Similarity is even greater if account is taken of the closer morphological cranial features between the fossil forms under study and the largest known skull of all extant crocodilians, a T. schlegelii. Estimations of Tomistoma lusitanica’s overall length, somewhat in excess of 8 meters, confirm this form attained a giant size. These top predators undoubtedly preyed or scavenged upon very large prey. They also scavenged on corpses. Tomistoma lusitanica undoubtedly was one of the largest crocodilians that ever existed and whose maximum dimensions seem to have attained those of the Siwaliks’ Rhamphosuchus crassidens, long regarded as the Neogene nec plus ultra in size. Tomistoma lusitanica was one of the largest crocodilians from all times, and even the largest western Eurasia reptile after the age of the dinosaurs.

Original languagePortuguese
Pages (from-to)117-130
Number of pages14
JournalAnuario do Instituto de Geociencias
Volume40
Issue number3
DOIs
Publication statusPublished - 2017

Fingerprint

North Africa
crushing
Western Europe
immigration
predation
Miocene
death
tooth
fossil
dinosaur
skull
reptile
Neogene
mammal
predator
diet
comparison
time

Keywords

  • Gomphotheres
  • Miocene
  • Predation
  • Tomistoma lusitanica
  • Tomistoma schlegelii

Cite this

@article{298355a1e70b4c4d8aeddc51ff4a6fa9,
title = "Crocodilos mioc{\^e}nicos de grande tamanho do oeste Europeu: Preda{\cc}{\~a}o, analogias com “Falsos Gaviais” e Tamanho",
abstract = "As shown here on the basis of bitten teeth, the diet of the huge, lower to early upper Miocene Tomistoma lusitanica included some of the largest contemporaneous, terrestrial mammals, including adult or senile gomphotheres (Gomphotherium angustidens). One of the latter would be, in a rough estimate, about 50 years old at death. Bite impressions are discussed, including marks resulting from impact, intense attrition and eventual crushing. The teeth of very large-sized tomistomines would have a not restricted to prehension role, they also acted as true cone devices for crushing hard parts. Crushing - non-tectonic effects - have also been observed on a suid fossil. The so far obtained results may point out that the very basic reason of the extant false-gharial, Tomistoma schlegelii’s prevailing ichthyophagy may be human pressure that prevents them to attain their possible maximum size, and hence to capture larger prey. The importance of immigration from Asia and biogeographic affinities is stressed. This seems obvious after the simultaneous presence of Tomistoma and Gavialis in westernmost Eurasia. Different data from North Africa do not contradict these views. Extrapolations based on the Miocene false-gharials contribute to a better understanding of the surviving species. Similarity is even greater if account is taken of the closer morphological cranial features between the fossil forms under study and the largest known skull of all extant crocodilians, a T. schlegelii. Estimations of Tomistoma lusitanica’s overall length, somewhat in excess of 8 meters, confirm this form attained a giant size. These top predators undoubtedly preyed or scavenged upon very large prey. They also scavenged on corpses. Tomistoma lusitanica undoubtedly was one of the largest crocodilians that ever existed and whose maximum dimensions seem to have attained those of the Siwaliks’ Rhamphosuchus crassidens, long regarded as the Neogene nec plus ultra in size. Tomistoma lusitanica was one of the largest crocodilians from all times, and even the largest western Eurasia reptile after the age of the dinosaurs.",
keywords = "Gomphotheres, Miocene, Predation, Tomistoma lusitanica, Tomistoma schlegelii",
author = "Antunes, {Miguel Telles}",
year = "2017",
doi = "10.11137/2017_3_117_130",
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pages = "117--130",
journal = "Anuario do Instituto de Geociencias",
issn = "0101-9759",
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TY - JOUR

T1 - Crocodilos miocênicos de grande tamanho do oeste Europeu

T2 - Predação, analogias com “Falsos Gaviais” e Tamanho

AU - Antunes, Miguel Telles

PY - 2017

Y1 - 2017

N2 - As shown here on the basis of bitten teeth, the diet of the huge, lower to early upper Miocene Tomistoma lusitanica included some of the largest contemporaneous, terrestrial mammals, including adult or senile gomphotheres (Gomphotherium angustidens). One of the latter would be, in a rough estimate, about 50 years old at death. Bite impressions are discussed, including marks resulting from impact, intense attrition and eventual crushing. The teeth of very large-sized tomistomines would have a not restricted to prehension role, they also acted as true cone devices for crushing hard parts. Crushing - non-tectonic effects - have also been observed on a suid fossil. The so far obtained results may point out that the very basic reason of the extant false-gharial, Tomistoma schlegelii’s prevailing ichthyophagy may be human pressure that prevents them to attain their possible maximum size, and hence to capture larger prey. The importance of immigration from Asia and biogeographic affinities is stressed. This seems obvious after the simultaneous presence of Tomistoma and Gavialis in westernmost Eurasia. Different data from North Africa do not contradict these views. Extrapolations based on the Miocene false-gharials contribute to a better understanding of the surviving species. Similarity is even greater if account is taken of the closer morphological cranial features between the fossil forms under study and the largest known skull of all extant crocodilians, a T. schlegelii. Estimations of Tomistoma lusitanica’s overall length, somewhat in excess of 8 meters, confirm this form attained a giant size. These top predators undoubtedly preyed or scavenged upon very large prey. They also scavenged on corpses. Tomistoma lusitanica undoubtedly was one of the largest crocodilians that ever existed and whose maximum dimensions seem to have attained those of the Siwaliks’ Rhamphosuchus crassidens, long regarded as the Neogene nec plus ultra in size. Tomistoma lusitanica was one of the largest crocodilians from all times, and even the largest western Eurasia reptile after the age of the dinosaurs.

AB - As shown here on the basis of bitten teeth, the diet of the huge, lower to early upper Miocene Tomistoma lusitanica included some of the largest contemporaneous, terrestrial mammals, including adult or senile gomphotheres (Gomphotherium angustidens). One of the latter would be, in a rough estimate, about 50 years old at death. Bite impressions are discussed, including marks resulting from impact, intense attrition and eventual crushing. The teeth of very large-sized tomistomines would have a not restricted to prehension role, they also acted as true cone devices for crushing hard parts. Crushing - non-tectonic effects - have also been observed on a suid fossil. The so far obtained results may point out that the very basic reason of the extant false-gharial, Tomistoma schlegelii’s prevailing ichthyophagy may be human pressure that prevents them to attain their possible maximum size, and hence to capture larger prey. The importance of immigration from Asia and biogeographic affinities is stressed. This seems obvious after the simultaneous presence of Tomistoma and Gavialis in westernmost Eurasia. Different data from North Africa do not contradict these views. Extrapolations based on the Miocene false-gharials contribute to a better understanding of the surviving species. Similarity is even greater if account is taken of the closer morphological cranial features between the fossil forms under study and the largest known skull of all extant crocodilians, a T. schlegelii. Estimations of Tomistoma lusitanica’s overall length, somewhat in excess of 8 meters, confirm this form attained a giant size. These top predators undoubtedly preyed or scavenged upon very large prey. They also scavenged on corpses. Tomistoma lusitanica undoubtedly was one of the largest crocodilians that ever existed and whose maximum dimensions seem to have attained those of the Siwaliks’ Rhamphosuchus crassidens, long regarded as the Neogene nec plus ultra in size. Tomistoma lusitanica was one of the largest crocodilians from all times, and even the largest western Eurasia reptile after the age of the dinosaurs.

KW - Gomphotheres

KW - Miocene

KW - Predation

KW - Tomistoma lusitanica

KW - Tomistoma schlegelii

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U2 - 10.11137/2017_3_117_130

DO - 10.11137/2017_3_117_130

M3 - Article

VL - 40

SP - 117

EP - 130

JO - Anuario do Instituto de Geociencias

JF - Anuario do Instituto de Geociencias

SN - 0101-9759

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ER -