The Giant Horned Crocodiles that Ate our Ancestors

Date de début:

09 Juin 2016 - 16:00

Type d'événement:

Séminaire

Publié ici :

09 Juin 2016

Mis à jour le :

12 Septembre 2017

Mots-clefs:

Préhistoire
crocodile
Paléontologie
Crocodiles
Cocodrilos
Juin
June (Month)
lieu
Conservation
Preservation
conservación-restauración
Organisation
Organization
Organizaciones

Zone géographique:

Afrique

ISIDORE Handle:

10670/1.9745zb

Evolution: an international research seminar in eastern Africa.

6ème séance / 6th session: The Giant Horned Crocodiles that Ate our Ancestors, par/by Christopher A. BROCHU (University of Iowa)

Lieu / Venue: Auditorium of the Authority for Research and Conservation of Cultural Heritage

Organisation: CFEE & Authority for Research and Conservation of the Cultural Heritage (Heritage Collection & Laboratory Service Directorate, Heritage Training Unit).

Crocodiles and related animals have a rich fossil record in eastern Africa. They were long perceived as unchanging “living fossils,” but a far more complex history is coming into view. Crocodiles from the early to middle Miocene (11 to 23 million years ago) are unrelated to the Nile crocodile (Crocodylus niloticus) currently living in the region. Instead, they include relatives of the modern West African dwarf crocodile (Osteolaemus) and a South American group related to the modern Indian gharial (Gavialis). These lineages had disappeared by 7 million years ago, replaced by crocodiles related – but not ancestral – to C. niloticus. Some of these had horns and may have grown to a length of 7.5 m – larger than C. niloticus. As many as five species may have coexisted in eastern Africa at one time. There is much yet to be learned; at least ten unnamed species have been identified in museum collections, and many more may yet be found. These were the largest predators our ancestors faced, and yet there is still much to be learned about the group – many unnamed species have been found in museum collections, and several questions remain unanswered: when did the ancestors of the Nile crocodile appear in eastern Africa? Why did the kinds of crocodiles found the region change between 11 and 7 million years ago? Did these changes occur at the same time throughout eastern Africa? Why did crocodylian diversity drop? The answer to these questions lies will be found in museum collections and ongoing field work.

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The Giant Horned Crocodiles that Ate our Ancestors

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The Giant Horned Crocodiles that Ate our Ancestors

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