Clade | |
Subclade |
Taxon | |
Taxon |
Stagonolepididae
|
Nominal Author | Lydekker 1887 |
2nd Nominal Author | |
Taxon Status | ACTIVE |
Comments | As initially defined by Heckert and Lucas (2000:fig. 2), Stagonolepididae overlaps with Aetosauria, except that the former is node-based and the latter stem-based. Heckert and Lucas (2000) then erected a redundant taxon Aetosaurinae for the basal genus Aetosaurus. Benton (2004) more recently proposed a confusing definition that is both node- and stem-based, depending on the interpretation of its meaning. The solution adopted here is to differentiate Stagonolepidididae from Aetosauria, using the former as a node-based taxon within a stem-based Aetosauria. In this way, Stagonolepidididae forms a node-stem triplet with Stagonolepidinae and Desmatosuchinae, to the exclusion of Aetosaurus (if current phylogentic analyses are reasonably correct; Heckert and Lucas 2000). Even though the original definition was also node-based, the active definition is a second-order revision, as it identifies a more restricted clade within Aetosauria. |
Potential Synonomy | Stagonolepidae |
Active Phylogenetic Definition | |
Active Definition |
The least inclusive clade containing Stagonolepis robertsoni Agassiz 1844 and Desmatosuchus haplocerus (Cope 1892).
|
Shorthand |
< Stagonolepis robertsoni and Desmatosuchus haplocerus. |
Definitional Author |
Sereno 2005 |
Definition Status | checked |
Definition Type | NODE |
Node-Stem Triplet | NODE |
Other Triplet Taxa |
Stagonolepidinae, Desmatosuchinae |
Specifiers | |
Specifier(s) A |
Stagonolepis robertsoni |
Specifier(s) B |
Desmatosuchus haplocerus |
Specifier(s) C | |
Qualifiers | |
+Taxon | |
-Taxon | |
Datum | |
Taxonomic Content | |
Publication Year |
Unknown Unknown Unknown 2005 |
Inactive Taxon Status | |
Rejection Criteria | |
Critique | |
Definitional History #1 | |
Earliest Record | The last common ancestor (and all of its descendants) of Aetosaurus and Desmatosuchus. |
Latest Record | Heckert and Lucas 2000:1544 |
Range (My) | |
Range (My) |
Aetosaurus, Desmatosuchus |
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Definitional History #2 | |
Earliest Record | Those taxa stemming from the last common ancestor of Stagoolepis robertsoni and Aetosaurus ferratus and sharing a more recent common ancestor with those species than with Mystriosuchus planirostris, Ornithosuchus longidens, or Crocodylia. |
Latest Record | Benton 2004:11 |
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Range (My) |
Stagonolepis robertosni, Aetosaurus ferratus, Mystriosuchus planirostris, Ornithosuchus longidens, Crocodylia |
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