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 chefifiensis 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.  The label is removed for photographic purposes. 

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 58

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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 66

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Elosuchus Crocodilian Tooth 67

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Elosuchus Crocodilian Tooth 70

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Elosuchus Crocodilian Tooth 80

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Elosuchus Crocodilian Tooth 81

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Elosuchus Crocodilian Tooth 82

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Elosuchus Crocodilian Tooth 83

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Elosuchus Crocodilian Tooth 84

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Elosuchus Crocodilian Tooth 85

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Elosuchus Crocodilian Tooth 87

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Elosuchus Crocodilian Tooth 88

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Elosuchus Crocodilian Tooth 91

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Elosuchus Crocodilian Tooth 92

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Elosuchus Crocodilian Tooth 93

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Elosuchus Crocodilian Tooth 94

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Elosuchus Crocodilian Tooth 95

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Elosuchus Crocodilian Tooth 97

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Elosuchus Crocodilian Tooth 98

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Elosuchus Crocodilian Tooth 100

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Elosuchus Crocodilian Tooth 101

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Elosuchus Crocodilian Tooth 103

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Elosuchus Crocodilian Tooth 104

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Elosuchus Crocodilian Tooth 106

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Elosuchus Crocodilian Tooth 107

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Elosuchus Crocodilian Tooth 109

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Elosuchus Crocodilian Tooth 111

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Elosuchus Crocodilian Tooth 112

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Amphibian (Salamander) fossils, USA

Siren lacertina Amphibian Vertebra 07

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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 01

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Fossil Alligator mississippiensis Scute 02

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Fossil Alligator mississippiensis Scute 05

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Fossil Alligator mississippiensis Scute 04

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Fossil Alligator mississippiensis Scute 010

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Fossil Alligator mississippiensis Scute 09

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Fossil Alligator mississippiensis Scute 08

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Fossil Alligator mississippiensis Scute 012

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Fossil Alligator mississippiensis Scute 011

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Fossil Alligator mississippiensis Scute 015

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Fossil Alligator mississippiensis Scute 014

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Fossil Alligator mississippiensis Scute 017

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Fossil Alligator mississippiensis Scute 019

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Fossil Alligator mississippiensis Scute 020

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Fossil Alligator mississippiensis Scute 021

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Fossil Alligator mississippiensis Scute 023

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Fossil Alligator mississippiensis Scute 018

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