| Ankyramorphs | |
|---|---|
 | |
| Skull ofLanthanosuchus watsoni, alanthanosuchoid | |
 | |
| Skeleton ofScutosaurus karpinskii, aprocolophonian | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | †Parareptilia |
| Order: | †Procolophonomorpha |
| Clade: | †Ankyramorpha DeBraga & Rieppel, 1996 |
| Subgroups | |
Ankyramorpha ("anchor forms") is anextinctclade ofprocolophonomorphparareptiles which lived between the earlyCisuralianepoch (middleSakmarian stage) and the latestTriassicperiod (latestRhaetian stage) ofAfrica,Antarctica,Asia,Australia,Europe,North America andSouth America.[1][2]
This clade was named in a1996 parareptile study byMichael deBraga andRobert R. Reisz. They provided the name Ankyramorpha for a newly recognized clade encompassing "the most recent common ancestor ofProcolophonia andLanthanosuchoidea and all its descendants", and this clade name sees continued use among modern parareptile studies.[3][4][5] A similar name,Hallucicrania, was provided in an earlier1995 study byMichael S. Y. Lee, who defined it as thenode-based taxon formed by themost recent common ancestor oflanthanosuchids and "pareiasauroids" (pareiasaurs +Sclerosaurus), and all its descendants. Unlike Ankyramorpha, which explicitly includedprocolophonoids, Hallucicrania was originally designed to exclude procolophonoids, which Lee's analysis argued to have split off prior to the divergence between lanthanosuchids and pareiasaurs.[6] Nevertheless, purely considering the taxa encompassed by their definitions, Hallucicrania and Ankyramorpha refer to an identical grouping.
The followingcladogram is simplified after the phylogenetic analysis of MacDougall and Reisz (2014) and shows the placement of Ankyramorpha withinParareptilia. Relationships within emboldened terminal clades are not shown.[5]
| Parareptilia |
| ||||||||||||||||||
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