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Clade
Subclade

Taxon
Taxon
Leptoceratopsidae
Nominal Author
Nopcsa 1923
2nd Nominal Author
Makovicky 2001
Taxon Status ACTIVE
Comments
Makovicky (2001) was first to recognize Leptoceratopsidae, using Nopcsa’s (1923) family group (originally Leptoceratopsinae). With several new genera and significant supporting character evidence (Makovicky 2001, Chinnery 2004), Leptoceratopsidae now circumscribes a small clade distributed across central Asia and western North America. The active definition is a textual variant of that used by Makovicky (2001).
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Leptoceratops gracilis Brown 1914 but not Triceratops horridus Marsh 1889.
Shorthand
> Leptoceratops gracilis but not Triceratops horridus.
Definitional Author
Makovicky 2001
Definition Status ORIGINAL
Definition Type STEM
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Leptoceratops gracilis
Specifier(s) B
Specifier(s) C
Triceratops horridus
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
2001

Inactive Taxon Status
Rejection Criteria
Critique
.
 

Definitional History #1
Earliest Record
All taxa closer to Leptoceratops gracilis than to Triceratops horridus.
Latest Record
Makovicky 2001:254
Range (My)
Range (My)
Leptoceratops gracilis, Triceratops horridus
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