REPTILE FOSSILS

The origin of the reptiles lies about 310–320 million years ago, in the steaming swamps of the late Carboniferous period, when the first reptiles evolved from advanced reptiliomorphs.  The oldest known animal that may have been an amniote is Casineria (though it may have been a temnospondyl). A series of footprints from the fossil strata of Nova Scotia dated to 315 Mya show typical reptilian toes and imprints of scales. These tracks are attributed to Hylonomus, the oldest unquestionable reptile known. It was a small, lizard-like animal, about 20 to 30 centimetres (7.9 to 11.8 in) long, with numerous sharp teeth indicating an insectivorous diet. Other examples include Westlothiana (for the moment considered a reptiliomorph rather than a true amniote) and Paleothyris, both of similar build and presumably similar habit.

Rise of the reptiles. The earliest amniotes, including stem-reptiles (those amniotes closer to modern reptiles than to mammals), were largely overshadowed by larger stem-tetrapods, such as Cochleosaurus, and remained a small, inconspicuous part of the fauna until the Carboniferous Rainforest Collapse. This sudden collapse affected several large groups. Primitive tetrapods were particularly devastated, while stem-reptiles fared better, being ecologically adapted to the drier conditions that followed. Primitive tetrapods, like modern amphibians, need to return to water to lay eggs; in contrast, amniotes, like modern reptiles – whose eggs possess a shell that allows them to be laid on land – were better adapted to the new conditions. Amniotes acquired new niches at a faster rate than before the collapse and at a much faster rate than primitive tetrapods. They acquired new feeding strategies including herbivory and carnivory, previously only having been insectivores and piscivores. From this point forward, reptiles dominated communities and had a greater diversity than primitive tetrapods, setting the stage for the Mesozoic (known as the Age of Reptiles). One of the best known early stem-reptiles is Mesosaurus, a genus from the early Permian that had returned to water, feeding on fish.

Elosuchus cherifiensis Crocodile Teeth, Cretaceous Morocco
Crocodilian Teeth from the Gharial like, long snout Cretaceous beasty.  These are Early Cretaceous (Cenomanian), Aufous Fm, Morocco. All come boxed and labelled.  Where the tooth is too big for a label, this will come with the box.  Some of the labels are removed for photographic purposes. 

Elosuchus Crocodilian Tooth 145

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Elosuchus Crocodilian Tooth 147

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Elosuchus Crocodilian Tooth 153

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Elosuchus Crocodilian Tooth 154

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Elosuchus Crocodilian Tooth 51

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Elosuchus Crocodilian Tooth 52

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Elosuchus Crocodilian Tooth 53

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Elosuchus Crocodilian Tooth 54

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Elosuchus Crocodilian Tooth 55

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Elosuchus Crocodilian Tooth 56

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Elosuchus Crocodilian Tooth 57

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Elosuchus Crocodilian Tooth 59

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Elosuchus Crocodilian Tooth 60

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Elosuchus Crocodilian Tooth 61

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Elosuchus Crocodilian Tooth 62

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Elosuchus Crocodilian Tooth 63

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Elosuchus Crocodilian Tooth 64

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Elosuchus Crocodilian Tooth 65

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Elosuchus Crocodilian Tooth 80

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Elosuchus Crocodilian Tooth 81

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Elosuchus Crocodilian Tooth 84

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Elosuchus Crocodilian Tooth 87

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Elosuchus Crocodilian Tooth 88

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Elosuchus Crocodilian Tooth 92

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Elosuchus Crocodilian Tooth 93

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Elosuchus Crocodilian Tooth 95

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Elosuchus Crocodilian Tooth 98

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Elosuchus Crocodilian Tooth 100

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Elosuchus Crocodilian Tooth 103

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Elosuchus Crocodilian Tooth 106

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Elosuchus Crocodilian Tooth 109

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Elosuchus Crocodilian Tooth 111

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Amphibian (Salamander) fossils, USA
Eel-like Amphibian (Salamander) Vertebra from the North Florida Pleistocene clay. These are fiddly little fossils to find, and not too common.

Siren lacertina Amphibian Vertebra 07

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Siren lacertina Amphibian Vertebra 08

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Siren lacertina Amphibian Vertebra 09

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Siren lacertina Amphibian Vertebra 010

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Siren lacertina Amphibian Vertebra 011

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Siren lacertina Amphibian Vertebra 012

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Siren lacertina Amphibian Vertebra 014

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Siren lacertina Amphibian Vertebra 015

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Siren lacertina Amphibian Vertebra 016

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Siren lacertina Amphibian Vertebra 017

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Siren lacertina Amphibian Vertebra 018

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Siren lacertina Amphibian Vertebra 019

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Siren lacertina Amphibian Vertebra 021

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Siren lacertina Amphibian Vertebra 022

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Siren lacertina Amphibian Vertebra 023

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Siren lacertina Amphibian Vertebra 024

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Siren lacertina Amphibian Vertebra 025

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Siren lacertina Amphibian Vertebra 026

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Siren lacertina Amphibian Vertebra 027

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Siren lacertina Amphibian Vertebra 028

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Siren lacertina Amphibian Vertebra 029

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Siren lacertina Amphibian Vertebra 030

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Siren lacertina Amphibian Vertebra 032

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Alligator mississippiensis Scute & Teeth fossils, USA
Fossil dermal scutes and Teeth from Alligators. These scute fossils are identified by the ridge along the middle of the scute and pitted surface. Teeth are nearly always conical and domed shaped. All below belong to Alligator mississippiensis sp and are dated to between 1.0 and 1.5 Million years old.

Fossil Alligator mississippiensis Scute + Tooth Set 01

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Fossil Alligator mississippiensis Scute + Tooth Set 09

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Fossil Alligator mississippiensis Scute + Tooth Set 012

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Fossil Alligator mississippiensis Scute + Tooth Set 011

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Fossil Alligator mississippiensis Scute + Tooth Set 014

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Fossil Alligator mississippiensis Scute + Tooth Set 020

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Fossil Alligator mississippiensis Scute + Tooth Set 021

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