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alligator

alligator  

; class Reptilia, order Crocodylia)A family of crocodilians that have a broad, flat snout in which the fourth tooth of the lower jaw fits into a pit in the upper jaw and cannot be seen when the mouth ...
bird

bird  

A class (Aves) of endothermic (see endotherm) vertebrates that are adapted for flight, bipedal walking or running, and, in some species, swimming on or below the surface of water; flightless species ...
crocodile

crocodile  

; subclass Archosauria, order Crocodilia)A family of crocodilians in which the fourth tooth of the lower jaw fits into a notch in the upper jaw, being visible when the mouth is closed. Crocodylus ...
diapsid

diapsid  

Applied to a type of skull that has two temporal openings behind the eye. This is typical of Archosauria, Lepidosauria, and Rhynchocephalia. See also Diapsida.Diapsid
dinosaur

dinosaur  

Literally the name means ‘terrible lizards’, but in fact the dinosaurs were not lizards. They were diapsid reptiles whose closest living relatives are the crocodilians and birds. Dinosaurs first ...
ecdysis

ecdysis  

The periodic shedding of the exoskeleton by some invertebrates, or of the outer skin by some Amphibia and Reptilia.
egg

egg  

The reproductive structure of certain animals, e.g. reptiles, birds, and insects, consisting of an ovum together with nutritive and protective tissues, and from which, when fertilized, a young ...
Gnathostomata

Gnathostomata  

A subphylum or superclass of chordates consisting of all vertebrates that possess jaws. It contains six extant classes: Chondrichthyes (cartilaginous fishes), Osteichthyes (bony fishes), Amphibia, ...
herpetofauna

herpetofauna  

Reptiles (such as snakes, turtles, and lizards) and amphibians (such as frogs, toads, and salamanders).
herpetology

herpetology  

The branch of zoology concerned with the study of reptiles and amphibians, which are sometimes collectively known as herps or herptiles.
lizard

lizard  

AMONG GLOBAL VERTEBRATE FAUNA, LIZARDS are almost ubiquitous features. Although most are tropical, many occur in temperate climates. In the New World, they are found as far north as southern ...
nictitating membrane

nictitating membrane  

In some vertebrates, a lid-like membrane that is attached to the anterior corner of the eye. When drawn across the eye it reduces illumination of the retina. It is common in Reptilia and Aves, and ...
os innominatum

os innominatum  

In adult Reptilia, Aves, and Mammalia, in which the pubis, ilium, and ischium bones of the pelvis are fused into a single bone, one of the two lateral halves of the resulting bone.
patella

patella  

A small rounded movable bone that is situated in a tendon in front of the knee joint in most mammals (including humans). The function of the patella is to protect the knee.
Permian

Permian  

The latest period of Palaeozoic time, stretching approximately from 290 to 248 million years bp.http://www.ucmp.berkeley.edu/permian/permian.html An overview of the Permian period.
phylum

phylum  

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Overview Page
In animal taxonomy, one of the major groupings, coming below subkingdom and kingdom, and comprising superclasses, classes, and all lower taxa.
precoracoid

precoracoid  

A bone of the pectoral girdle, present as an element of the coracoid in some Amphibia and as a separate bone in many Reptilia and some Monotremata, but which is vestigial or absent as a distinct ...
saurian

saurian  

Of or resembling a lizard. Applied loosely to lizard-like animals and also to fossils, life habits, etc. of extinct reptiles.
snakes

snakes  

Proverbial allusions to the snake focus on its venomous bite as representing a lurking danger; it is a type of deceit and treachery, as with reference to the fable by Aesop, in which the man who had ...
Tetrapoda

Tetrapoda  

In some classifications, a superclass of jawed chordates (Gnathostomata) comprising all vertebrate animals with four limbs, i.e. the amphibians, reptiles, birds, and mammals. The skeleton of the ...

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