Synapsids ('fused arch') also known as Theropsids ('beast face'), traditionally described as 'mammal-like reptiles', are a group of amniotes (the other being the sauropsids) that developed one opening in their skull (temporal fenestra) behind each eye, about 320 million years ago (mya) during the late Carboniferous Period.
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| - Synapsids ('fused arch') also known as Theropsids ('beast face'), traditionally described as 'mammal-like reptiles', are a group of amniotes (the other being the sauropsids) that developed one opening in their skull (temporal fenestra) behind each eye, about 320 million years ago (mya) during the late Carboniferous Period.
- Synapsids ('fused arch') are a clade of animals that includes mammals and everything closer to mammals than to other living amniotes. In classical systematics, the non-mammalian members are described as "mammal-like reptiles", and are sometimes referred to as "proto-mammals" or "stem-mammals". Synapsids are one of the two major groups of amniote, the other being the sauropsids. They are distinguished from the latter by a single opening (temporal fenestra) in their skull behind each eye, which developed in the ancestral synapsid about 324 MYA during the late Carboniferous period.
- Synapsids ('fused arch'), also known as theropsids ('beast eye'), are a class of animals that includes mammals and everything closer to mammals than to other living amniotes. The non-mammalian members were traditionally described as mammal-like reptiles, and are sometimes referred to as "proto-mammals" or "stem-mammals". Synapsids are one of the two major groups of amniote, the other being the sauropsids (or reptiles in the proper sense). They are distinguished from the latter by a single opening (temporal fenestra) in their skull behind each eye, which developed in the ancestral synapsid about 324 million years ago (mya) during the late Carboniferous Period.
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| Caption
| - Dimetrodon grandis skeleton at the National Museum of Natural History of U.S.A.
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| - 320(xsd:integer)
- Late Carboniferous - Middle Cretaceous
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| - Dimetrodon grandis skeleton at the National Museum of Natural History.
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| - * Order Pelycosauria *
** Suborder Caseasauria
** Suborder Eupelycosauria *
* Order Therapsida''' *
** Suborder Biarmosuchia
** Suborder Dinocephalia
** Suborder Anomodontia
** Suborder Gorgonopsia
** Suborder Therocephalia
** Suborder Cynodontia *
For complete phylogeny, see text.
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| Class
| - Synapsida * (Osborn, 1903)
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| - * Order Pelycosauria *
** Suborder Caseasauria
** Suborder Eupelycosauria *
* Order Therapsida''' *
** Suborder Biarmosuchia
** Suborder Dinocephalia
** Suborder Anomodontia
** Suborder Gorgonopsia
** Suborder Therocephalia
** Suborder Cynodontia *
For complete phylogeny, see text.
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| abstract
| - Synapsids ('fused arch') are a clade of animals that includes mammals and everything closer to mammals than to other living amniotes. In classical systematics, the non-mammalian members are described as "mammal-like reptiles", and are sometimes referred to as "proto-mammals" or "stem-mammals". Synapsids are one of the two major groups of amniote, the other being the sauropsids. They are distinguished from the latter by a single opening (temporal fenestra) in their skull behind each eye, which developed in the ancestral synapsid about 324 MYA during the late Carboniferous period. The non-mammalian synapsids are traditionally divided into a primitive and an advanced group, known respectively as 'pelycosaurs' and therapsids.
- Synapsids ('fused arch'), also known as theropsids ('beast eye'), are a class of animals that includes mammals and everything closer to mammals than to other living amniotes. The non-mammalian members were traditionally described as mammal-like reptiles, and are sometimes referred to as "proto-mammals" or "stem-mammals". Synapsids are one of the two major groups of amniote, the other being the sauropsids (or reptiles in the proper sense). They are distinguished from the latter by a single opening (temporal fenestra) in their skull behind each eye, which developed in the ancestral synapsid about 324 million years ago (mya) during the late Carboniferous Period. Synapsids were the dominant terrestrial animals in the middle to late Permian period. As with almost all life forms then extant, their numbers and variety were severely reduced by the Permian extinction. Some species survived into the Triassic period, but archosaurs quickly became the dominant animals and few of the non-mammalian synapsids outlasted the Triassic, although survivors persisted into the Cretaceous. However, they included the prehistoric ancestors of mammals and in this sense, synapsids are still very much a living class of vertebrates.
- Synapsids ('fused arch') also known as Theropsids ('beast face'), traditionally described as 'mammal-like reptiles', are a group of amniotes (the other being the sauropsids) that developed one opening in their skull (temporal fenestra) behind each eye, about 320 million years ago (mya) during the late Carboniferous Period.
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