synapsidadj.n.
/sɪˈnapsɪd/ A. adj.
Of or pertaining to the subclass Synapsida, which includes fossil reptiles having a single temporal opening on each side of the skull.
ΘΚΠ
the world > animals > mammals > [adjective] > of fossil or extinct types
thylacotherian1838
multituberculate1884
tinoceratid1891
synapsidan1903
synapsid1910
symmetrodont1950
1910 Bull. Amer. Mus. Nat. Hist. 27 114 The Synapsid reptiles..may conveniently be approached by a cursory review of the reptilian orders.
1933 A. S. Romer Vertebr. Paleontol. vi. 128 Forms with one opening (in which it was presumed that the two openings had fused into one), [were termed] ‘synapsid’ (fused-arched) reptiles.
1956 A. S. Romer Osteol. Reptiles ii. 473 The mesosaurs..are associated with the synapsid orders.
1974 D. Webster & M. Webster Compar. Vertebr. Morphol. v. 102 The presence of this bone in both monotremes, where it is apparently functionless, as well as in metatherians is particularly confusing since there is no indication of a marsupial bone in synapsid reptiles.
1980 Nature 24 Jan. 378/2 An alternative view of the origin of the synapsid skull is that the ancestral condition of the temporal region consisted of a large supratemporal bone which was in contact anteriorly with the postorbital.
B. n.
A fossil reptile of the subclass Synapsida, showing a skull structure with some mammalian characteristics.
ΘΚΠ
the world > animals > mammals > [noun] > fossil or extinct
legh1774
thylacothere1838
anthracothere1848
anchithere1868
amblypod1877
Bramathere1879
multituberculate1888
promammal1889
tillodont1889
tinoceratid1895
uintathere1898
arsinoitherium1902
symmetrodont1933
synapsid1956
1956 A. S. Romer Osteol. Reptiles ii. 474 The synapsids..seem to be a very natural assemblage.
1980 Nature 24 Jan. 378/2 The mammals arose from advanced synapsids in the Upper Triassic.
Derivatives
syˈnapsidan adj.
ΘΚΠ
the world > animals > mammals > [adjective] > of fossil or extinct types
thylacotherian1838
multituberculate1884
tinoceratid1891
synapsidan1903
synapsid1910
symmetrodont1950
1903 Mem. Amer. Mus. Nat. Hist. 1 460 In all Synapsidan types above the Cotylosauria the squamosals and pro-squamosals early coalesce.
This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2018).
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adj.n.1903