Definitions for synapsid
synap·sid

Princeton's WordNetRate this definition:0.0 / 0 votes

1. synapsid, synapsid reptilenoun

   extinct reptile having a single pair of lateral temporal openings in the skull

WiktionaryRate this definition:0.0 / 0 votes

1. synapsidnoun

   Any animal (including all mammals) of the class Synapsida.

2. synapsidadjective

   Pertaining to the class Synapsida, of animals which have an opening low in the skull roof behind each eye, leaving a bony arch beneath each.

3. Etymology: Modern Latin Synapsida, from syn- + ἁψίς.

WikipediaRate this definition:0.0 / 0 votes

1. Synapsid

   Synapsids are one of the two major groups of animals that evolved from basal amniotes, the other being the sauropsids, the group that includes reptiles and birds. The group includes mammals and every animal more closely related to mammals than to sauropsids. Unlike other amniotes, synapsids have a single temporal fenestra, an opening low in the skull roof behind each eye orbit, leaving a bony arch beneath each; this accounts for their name. The distinctive temporal fenestra developed about 318 million years ago during the Late Carboniferous period, when synapsids and sauropsids diverged, but was subsequently merged with the orbit in early mammals. Traditionally, non-mammalian synapsids were believed to have evolved from reptiles, and therefore described as mammal-like reptiles in classical systematics, and primitive synapsids were also referred to as pelycosaurs, or pelycosaur-grade synapsids. These paraphyletic terms have now fallen into disfavor and are only used informally (if at all) in modern literature, because it is now known that synapsids are not reptiles, nor are they part of reptilian lineage in a cladistical sense. They are now more correctly referred to as stem mammals, and sometimes as proto-mammals, or paramammals.Synapsids were the largest terrestrial vertebrates in the Permian period, 299 to 251 million years ago, equalled only by some large pareiasaurs at the end of the Permian. Most lineages of pelycosaur-grade synapsids were replaced at the end of Early Permian by the more advanced therapsids. Synapsid numbers and variety were severely reduced by the Permian–Triassic extinction. Only the therapsid dicynodonts and eutheriodonts (consisting of Therocephalia and Cynodontia) are known to have continued into the Triassic period. The cynodont group Probainognathia, which includes Mammaliaformes (mammals and their closer ancestors), were the only synapsids to survive beyond the Triassic.During the Triassic, the sauropsid archosaurs became the largest and most numerous land vertebrates, and gave rise to the dinosaurs. When all non-avian dinosaurs were wiped out by the Cretaceous–Paleogene extinction event, the mammalian synapsids diversified again to become the largest land and marine animals on Earth.

ChatGPTRate this definition:0.0 / 0 votes

1. synapsid

   A synapsid is a type of vertebrate animal characterized by a single hole on each side of the skull behind the eye socket. These animals first appeared in the Carboniferous period and include mammals as well as their extinct, mammal-like predecessors. The term 'synapsid' refers to the evolutionary trait of having a 'synapsis', or fusion, in certain skull bones.

WikidataRate this definition:0.0 / 0 votes

1. Synapsid

   Synapsids, synonymous with theropsids, are a group of animals that includes mammals and every animal more closely related to mammals than to other living amniotes. They are easily separated from other amniotes by having a temporal fenestra, an opening low in the skull roof behind each eye, leaving a bony arch beneath each; this accounts for their name. Primitive synapsids are usually called pelycosaurs; more advanced mammal-like ones, therapsids. The non-mammalian members are described as mammal-like reptiles in classical systematics; they can also be called "stem mammals". Synapsids evolved from basal amniotes and are one of the two major groups of the later amniotes; the other is the sauropsids, a group that includes modern reptiles and birds. The distinctive temporal fenestra developed in the ancestral synapsid about 324 million years ago, during the Late Carboniferous period. Synapsids were the largest terrestrial vertebrates in the Permian period, 299 to 251 million years ago. As with almost all groups then extant, their numbers and variety were severely reduced by the Permian-Triassic extinction. Though some species survived into the Triassic period, archosaurs became the largest and most numerous land vertebrates in the course of this period. Few of the nonmammalian synapsids outlasted the Triassic, although survivors persisted into the Cretaceous. However, as a phylogenetic unit, they included the mammals as descendants, and in this sense synapsids are still very much a living group of vertebrates. After the Cretaceous–Paleogene extinction event, the synapsids again became the largest land animals.

Matched Categories

1. • Reptile

How to pronounce synapsid?

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How to say synapsid in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of synapsid in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of synapsid in Pythagorean Numerology is: 8

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=synapsid
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Synapsid
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Synapsid
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=synapsid