Dictionary > Crocodilia

Crocodilia

Definition
noun
(taxonomy) A taxonomic order that includes the crocodilian species
Supplement
The order Crocodilia is comprised of all crocodilian species, such as true crocodiles, alligators, true gharials, false gharials, and caimans. They appeared in the Late Cretaceous period, therefore, around 83.5 million years ago. The true crocodiles (family Crocodylidae) are amphibious reptiles that inhabit land and aquatic habitats such as rivers, wetlands, and lakes. The crocodile, Crocodylus porosus, is adapted to a marine environment and often resides in brackish waters such as mangrove swamps, estuaries, lagoons, and deltas throughout the tropics in Australia, America, Africa, and Asia. An obvious morphological distinction of crocodiles that make them identifiable from other crocodilians, particularly alligators and caimans, is having a V-shaped snout. Another distinctive morphological feature is having a large fourth tooth in the lower jaw that fits into a constriction in the upper jaw when the mouth is closed. The alligators are large carnivorous reptiles. There are two known extant species of alligators, i.e. Alligator mississippiensis (common alligator) and Alligator sinensis (Yangtze alligator). Morphologically, alligators have a shorter and broader snout than the crocodile, thus, shaped like a letter U, and the large teeth of the lower jaw shut into pits in the upper jaw, which has no marginal notches. The caimans (subfamily Caimaninae of the family Alligatoridae) are a crocodilian group found living in several tropical habitats in South and Central America such as swamps, marshes, mangrove rivers, and lakes. They have a scaly skin and smaller in size compared with alligators. The gharials (family Gavialidae) are characterized by their distinctive narrow snout, which is advantageous for catching aquatic preys such as fish. They are native to the northern part of the Indian subcontinent. Another group from the same family is the false gharials. The false gharials differ from the true gharials in a way that the formers’ snout broadens considerably towards the base.
Variant:

  • Crocodylia

Scientific classification:

  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Reptilia
  • Superorder: Crocodylomorpha
  • Clade: Eusuchia
  • Order: Crocodilia (Owen, 1842)

See also:


You will also like...

squirrel
Animal Water Regulation

Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

Plant Water Regulation
Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

Water Cycle
The Water Cycle

The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

Adaptation Tutorial
Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

Plant biology
Plant Biology

Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

Early Earth
The Origins of Life

This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

Related Articles...

No related articles found

See all Related Topics