Synapsids are one of the two major groups of vertebrates which evolved from basal amniotes. 'Synapsids' means 'fused arch', and refers to their skulls...

eggs, but are not synapsids. Otherwise precursors of reptiles (sauropsids) get lumped together with precursors of mammals (synapsids). Its only justification...

into two main lines, the synapsids and the sauropsids, both of which persist into the modern era. The oldest known fossil synapsid is Protoclepsydrops from...

Therapsids, previously known as the mammal-like reptiles, are a group of synapsids. The clade includes the mammals, which are descended from the cynodont...

descent, but a good example of the evolutionary grade typical of Permian synapsids. Dimetrodon evolved from lizard like syanspids from the Late Carboniferous...

Hence, it cannot have been the ancestor of any synapsids, which have only one such opening. Synapsids diverged from the common amniote tree before the...

Archaeothyris was one of the earliest definite synapsids. It lived in the late Carboniferous period, 306 million years ago. It shares this fame with another...

glandular rather than scaled integument". Meaning: since the skin of synapsids had glands in it, the development of milk production was possible. During...

the Devonian. The amniotes were the earliest to lay cleidoic eggs. The Synapsids (> mammals) and the Sauropsids (> reptiles) are sister clades, and in...

Mammal-like reptile is an old term for the therapsids: those synapsids which gave rise to the true mammals. The term is both outmoded and a mistake, because...

remains of Protoclepsydrops suggest it may have been a synapsid. If so, it is the oldest synapsid known, though its status is unconfirmed because its remains...

invertebrate groups, life's conquest of land, the evolution of fish, reptiles, synapsids (the ancestors of mammals), amphibians, insects, and plants, the formation...

to open wider. This made the theriodonts the most successful group of synapsids. Eutheriodonts refer to all theriodonts except the gorgonopsians (the...

the early Permian.p30 As the climate became drier, egg-laying amniotes (Synapsids and Sauropsids) became more common than amphibia. These are the lines...

older term for the group: Stegocephalia. The amniotes (Sauropsids and Synapsids) developed deeper skulls. Otic notch behind each eye at the back edge...

Plesiosaurs This was a major change, because in the middle Triassic period, the Synapsids (mammals' ancestors) were still dominant. Many reptile groups became extinct...

Pelycosaurs (meaning "basin lizards") were the earliest synapsids. They were not dinosaurs or reptiles. They are an informal group which were once called...

to live and move about in trees. The earliest one known is Suminia, a synapsid of the late Permian, about 260 million years ago. Cartmill M. 1985. Climbing...

probable earliest synapsid Hylonomus, from 312 mya, another early anapsid sauropsid Archaeothyris, from 306 mya, an early synapsid Petrolacosaurus, from...

cycles. During the Permian, tetrapod life, (amphibians, Sauropsids and Synapsids) which evolved in the Carboniferous, became widespread and diverse. The...

differentiated teeth, for different functions, unlike some of the first Synapsids. This allows Cynognathus to bite and tear it's food more easily and fast...

These gave rise to sauropsids (the ancestors of reptiles and birds) and synapsids (the ancestors of mammals. 'Reptile' is just a common term for those sauropsids...

articulate brachiopods. The most common land animal was the herbivorous synapsid Lystrosaurus. The earliest Triassic faunas lacked biodiversity and were...

Glacialisaurus (a large basal sauropodomorph), a crow-sized pterosaur, synapsids, and another unknown theropod. There are also the remains of many plant...

replacement and determinate growth, are mammalian features.p324/346 Earlier synapsids replace their teeth throughout life, as sauropsids also do. This is known...

a rabbit to a beaver. They were the last family of the non-mammalian synapsids. One of the last cynodont lines to appear, the family Tritylodontidae...

cleidoic eggs on land. The amniotes gave rise to two groups: one was the synapsids, which eventually gave rise to the mammals. The second group, the sauropsids...

terrestrial vertebrates and many of the large amphibia, primitive reptiles and synapsids. It is the only known extinction event of insects. It ended the Palaeozoic...

very first true amniotes, that is, egg-layers before the split between Synapsids and Sauropsids. Casineria pushes back the origin of amniote lineages much...

and the cloaca are primitive ('basal') features inherited from earlier synapsid tetrapods. But the monotremes also have other features such as the production...

probably had few predators, although the apex predator of the time was the synapsid Dimetrodon, which was even larger. Several complete skeletons of Eryops...

Greek mythology whose gaze could turn you to stone, and arch refers to synapsid skull holes This short article about biology can be made longer. You can...

but before the amniotes split into sauropsids (reptile ancestors) and synapsids (mammal ancestors). The basic reproduction strategy of amphibia (frogs...

they were less effective, and the ancestors of mammals and reptiles (the Synapsids and Sauropsids) gradually took over the land. They laid cleidoic eggs...

the segment features Mesozoic animals on land. These include dinosaurs, synapsids and Archaeopteryx. The fourth half of the segment features the extinction...

egg-laying amniotes in the first part of the Carboniferous period. The synapsids are the other group which evolved from amniotes. They gave rise, eventually...

made their way from the gill covers of fish to the rear jaw bones of Synapsids to their present position in the ear of mammals. In the fossil record...

1899. A vital early tetrapod fossil has been found here, the earliest synapsid, Protoclepsydrops, which is actually earlier than Hylonomus. In 2007, a...

sail that was wider than its body. Edaphosaurus was possibly the first synapsid to regulate its own body temperature by using the sail on it's back. Dimtrodon...

the skull behind the eyes. Holes started to appear in both Sauropsid and Synapsid skulls. They made the skull lighter, gave attachment points for muscles...

million years ago during the Cambrian explosion. During the Permian period, synapsids, including ancestors of mammals, dominated land but were mostly wiped...

Carboniferous Pennsylvanian Tropical climate: abundant insects, first synapsids and reptiles; coal forests 323.2 million Mississippian Large primitive...

on phylogeny, the Sauropsida excludes basal amniotes and the synapsid line. The synapsids are popularly known as "mammal-like reptiles". An example is...

Rhodanosaurus – junior synonym of Struthiosaurus Rhoetosaurus Rhopalodon – a synapsid Riabininohadros Richardoestesia "Rileya" – preoccupied name, now known...

Sphenacodon is a genus of sphenacodont that lived during the Early Permian period. Sphenacodon was related to Dimetrodon. Sphenacodon made an appearance...

Sphenacodontoidea is Superfamily of the Pelycosaurs. Which Includes Sphenacodontids and Edaphosaurids. This short article about biology can be made longer...