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Clade
Subclade

Taxon
Taxon
Crocodylia
Nominal Author
Gmelin 1789
2nd Nominal Author
Taxon Status ACTIVE
Comments

The first definition of Crocodylia was given by Brochu (1999:13). Several authors prior to Brochu (1999) refer to crown crocdilians, but these references fall short of the minimum for a complet phylogenetic definition. A crown clade, it should be kept in mind, need not have a node-based definition (Sereno 2005); even if node-based it may have different specifiers. Thus, although Benton and Clark (1988) limited Crocodylia to “crown group” crocodiles, they did not provide a specific definition (contra Brochu 1999:13). Similarly, Clark (1994:84) recognized Crocodylia as “including only the closest relatives of extant Crocodylia (the crocodylian crown-group).”

Brochu (1999) defined Crocodylia as “the last common ancestor of alligatorids, crocodylids, and gavialoids, and all of its descendants.” Sereno (2001) used Gavialis gangeticus and Crocodylus niloticus as specifiers; Brochu (2003) refers to all three subclades by species, a textual variant of which is adopted here as the active definition. It is better to include Alligator mississippiensis, given alternative phylogenies that place Alligatoroidea as the basal sister taxon to other crocodylians (Densmore 1983, Buffetaut 1985).

Potential Synonomy
Crocodili (Gmelin 1789, spelling variant), Crocodilia (Owen 1842, spelling variant)

Active Phylogenetic Definition
Active Definition
The least inclusive clade containing Gavialis gangeticus (Gmelin 1789) and Alligator mississippiensis (Daudin 1801), Crocodylus niloticus (Laurenti 1768).
Shorthand
< Gavialis gangeticus and Alligator mississippiensis, Crocodylus niloticus.
Definitional Author
Brochu 2003
Definition Status TEXTUAL SUBSTITUTION
Definition Type NODE
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Gavialis gangeticus
Specifier(s) B
Alligator mississippiensis, Crocodylus niloticus
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1999

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
The last common ancestor of alligatorids, crocodylids, and gavialoids, and all of its descendants.”
Latest Record
Brochu 1999:13
Range (My)
Range (My)
alligatorids, crocodylids, gavialoids
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Definitional History #2
Earliest Record
Gavialis gangeticus, Crocodylus niloticus, and all descendants of their common ancestor.
Latest Record
Sereno 2001:1519
Range (My)
Range (My)
Gavialis gangeticus, Crocodylus niloticus
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Definitional History #3
Earliest Record
The last common ancestor of Gavialis gangeticus, Alligator mississippiensis, and Crocodylus niloticus and all of its descendants.
Latest Record
Brochu 2003:360
Range (My)
Range (My)
Gavialis gangeticus, Alligator mississippiensis, Crocodylus niloticus
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