# Captorhinida

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**Captorhinida** (older name: **Cotylosauria**) is a doubly [paraphyletic](/source/Paraphyletic) grouping of early [reptiles](/source/Reptile). [Robert L. Carroll](/source/Robert_L._Carroll) (1988) ranked it as an order in the subclass [Anapsida](/source/Anapsid), composed of the following suborders:[1]

- A paraphyletic **Captorhinomorpha**, containing the families [Protorothyrididae](/source/Protorothyrididae), [Captorhinidae](/source/Captorhinidae), [Bolosauridae](/source/Bolosauridae), [Acleistorhinidae](/source/Acleistorhinidae) and possibly also [Batropetidae](/source/Batropetidae)
- [Procolophonia](/source/Procolophonia), containing families [Nyctiphruretidae](/source/Nyctiphruretidae), [Procolophonidae](/source/Procolophonidae) and [Sclerosauridae](/source/Sclerosauridae)
- [Pareiasauroidea](/source/Pareiasauroidea), with families [Rhipaeosauridae](/source/Rhipaeosauridae) and [Pareiasauridae](/source/Pareiasauridae)
- [Millerosauroidea](/source/Millerosauroidea), with a single family [Millerettidae](/source/Millerettidae).

While they all share primitive features and resemble the ancestors of all modern reptiles, some of these families are more closely related to (or belong to) the clade [Parareptilia](/source/Parareptilia), while others are further along the line leading to [diapsids](/source/Diapsid). For this reason, the group is only used informally, if at all, by most modern paleontologists. All members of this group are thought to be extinct.

## References

1. R. L. Carroll (1988), *[Vertebrate Paleontology and Evolution](/source/Vertebrate_Paleontology_and_Evolution)*, W. H. Freeman and Company, New York

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