Crocodylus is one of three genera from the Crocodylinae subfamily extending from the Crocodylidae family.

Established species include three extinct species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

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• † Crocodylus acer
  Crocodylus acer
  "Crocodylus" acer is an extinct species of crocodyloid from the Eocene of Utah. A single well preserved skull was described by paleontologist Edward Drinker Cope in 1882 and remains the only known fossil of the species. It was found from the Wasatchian-age Green River Formation...
  
  - probably represents a distinct genus.
• † Crocodylus affinis
  Crocodylus affinis
  "Crocodylus" affinis is an extinct species of crocodyloid from the Eocene of Wyoming. Fossils were first described from the Bridger Formation by American paleontologist Othniel Charles Marsh in 1871. Marsh described the species, along with every other species of crocodyloid in the Bridger...
  
  - probably represents a distinct genus.
• † Crocodylus anthropophagus
  Crocodylus anthropophagus
  Crocodylus anthropophagus is an extinct species of crocodile from Plio-Pleistocene from Tanzania. It lived 1.84 million years ago.- Etymology :...
  
  , an extinct crocodile from Plio-Pleistocene of Tanzania.

There are thirteen living species:

• American Crocodile
  American Crocodile
  The American crocodile is a species of crocodilian found in the Neotropics. It is the most widespread of the four extant species of crocodiles from the Americas. Populations occur from the Atlantic and Pacific coasts of southern Mexico to South America as far as Peru and Venezuela. It also lives...
  
  , Crocodylus acutus
• Slender-snouted Crocodile
  Slender-snouted Crocodile
  The African Slender-snouted Crocodile is a species of crocodile. Recent studies in DNA and morphology suggest that it may belong in its own genus, Mecistops, but at present most continue to use Crocodylus for this species.African Slender-snouted Crocodile are native to freshwater habitats in...
  
  , Crocodylus cataphractus - studies in DNA
  DNA
  Deoxyribonucleic acid is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms . The DNA segments that carry this genetic information are called genes, but other DNA sequences have structural purposes, or are involved in...
  
   and morphology
  Morphology (biology)
  In biology, morphology is a branch of bioscience dealing with the study of the form and structure of organisms and their specific structural features....
  
   suggest this species may be more basal
  Basal (phylogenetics)
  In phylogenetics, a basal clade is the earliest clade to branch in a larger clade; it appears at the base of a cladogram.A basal group forms an outgroup to the rest of the clade, such as in the following example:...
  
   than Crocodylus and therefore belongs in its own genus, Mecistops.
• Orinoco Crocodile
  Orinoco Crocodile
  The Orinoco crocodile, Crocodylus intermedius, is a critically endangered crocodile found in freshwater in northern South America, in particular the Orinoco River. Typical measurements for adults range from 3 to 4.8 m . Typical weight for mature females is 200 kg and 380 kg for males...
  
  , Crocodylus intermedius
• Freshwater Crocodile
  Freshwater Crocodile
  The freshwater crocodile , also known as the Australian freshwater crocodile, Johnston's crocodile or colloquially as freshie, is a species of reptile endemic to the northern regions of Australia...
  
  , Crocodylus johnsoni
• Philippine Crocodile
  Philippine crocodile
  The Philippine crocodile is a crocodile found in the Philippines. It is also known as the Mindoro crocodile and the Philippine freshwater crocodile. In the Philippines, it is strictly prohibited to kill a crocodile, but its status is critically endangered from exploitation and unsustainable...
  
  , Crocodylus mindorensis
• Morelet's Crocodile
  Morelet's Crocodile
  Morelet's crocodile, also known as the Mexican crocodile, is a modest sized crocodilian found only in fresh waters of the Atlantic regions of Mexico, Belize and Guatemala. It usually grows to about in length. It is an endangered species.-History:...
  
   or Mexican Crocodile, Crocodylus moreletii
• Nile Crocodile
  Nile crocodile
  The Nile crocodile or Common crocodile is an African crocodile which is common in Somalia, Ethiopia, Uganda, Kenya, Egypt, Tanzania, Zambia, Zimbabwe, Gabon, South Africa, Malawi, Sudan, Botswana, and Cameroon...
  
   or African Crocodile, Crocodylus niloticus (the subspecies found in Madagascar is sometimes called the Black Crocodile)
• New Guinea Crocodile
  New Guinea Crocodile
  The New Guinea crocodile is a small species of crocodile found on the island of New Guinea.-Description:Crocodylus novaeguineae grows to a length of up to for males and for females, although most specimens are rather smaller. The body is grey-brown in colour, with dark brown to black markings on...
  
  , Crocodylus novaeguineae
• Mugger Crocodile
  Mugger Crocodile
  The mugger crocodile , also called the Indian, Indus, Persian, or marsh crocodile, is found throughout the Indian subcontinent and the surrounding countries...
  
  , Marsh Crocodile, or Indian Crocodile, Crocodylus palustris
• Saltwater Crocodile
  Saltwater Crocodile
  The saltwater crocodile, also known as estuarine or Indo-Pacific crocodile, is the largest of all living reptiles...
  
   or Estuarine Crocodile, Crocodylus porosus
• Cuban Crocodile
  Cuban crocodile
  The Cuban crocodile is a small species of crocodile found only in Cuba's Zapata Swamp and the Isle of Youth, and highly endangered, though it formerly ranged elsewhere in the Caribbean...
  
  , Crocodylus rhombifer
• Siamese Crocodile
  Siamese Crocodile
  Siamese crocodile is a freshwater crocodile native to Indonesia , Brunei, East Malaysia, Laos, Cambodia, Burma, Thailand, and Vietnam...
  
  , Crocodylus siamensis
• Desert Crocodile
  Desert Crocodile
  The desert crocodile, Northwest African crocodile, or West African crocodile is a species of crocodile distantly related to the Nile crocodile . The crocodile inhabits the Republic of Congo, Uganda, Gambia, Senegal, Mauritania, Burkina Faso, Ivory Coast, the Democratic Republic of Congo, Chad...
  
  , Crocodylus suchus

• Crocodylus raninus
  Crocodylus raninus
  Crocodylus raninus is a species of freshwater crocodile endemic to Borneo, Indonesia.Has been considered as a synonym of Crocodylus porosus. Its status remains unclear....
  
  (Has been considered as a synonym of Crocodylus porosus. Its status remains unclear.)

Phylogeny

The cladogram

Cladogram

A cladogram is a diagram used in cladistics which shows ancestral relations between organisms, to represent the evolutionary tree of life. Although traditionally such cladograms were generated largely on the basis of morphological characters, DNA and RNA sequencing data and computational...

 below follows the topology from a 2011 analysis of mitochondrial DNA sequences by Robert W. Meredith, Evon R. Hekkala, George Amato and John Gatesy.