prevomerとは 意味・読み方・使い方

名詞

prevomer (plural prevomers)

1. (zoology) A bone from non-mammalian vertebrates forming the anterior roof of the palate.
   • 1925, Samuel Wendell Williston, "Chapter 1" in The Osteology of the Reptiles

     Only in the Chelonia (Fig. 32 b) are the prevomers single, though sometimes fused in the Rhiptoglossa, Theropoda, and Theriodontia (Figs. 43 c, 44 e). They are edentulous in all known reptiles except the Cotylosauria (Fig. 6), some Theromorpha, perhaps, certain "Pseudosuchia," Diaptosauria (Fig. 63), and Squamata. Posteriorly in the Squamata (Figs. 55 c, 56 b) they articulate with the palatines only, as also in some Chelonia (Figs. 31 a, 32 b) and Plesiosauria (Fig. 46 b). Generally believed not to represent the unpaired vomer of the mammals.