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Intertemporal Bone
The Intertemporal bone is a paired Skull, cranial bone present in Osteichthyes, bony fish and certain extinct amphibian-Evolutionary grade, grade tetrapods. It lies in the rear part of the skull, behind the eyes. Many lineages of four-limbed vertebrates ("tetrapods" in the broad sense) have lost the intertemporal bone. These include ''Acanthostega'', ''Ichthyostega, Icththyostega'', Colosteidae, colosteids (except for a vestigial intertemporal in ''Greererpeton''), Diadectomorpha, diadectomorphs, Lepospondyli, lepospondyls, and amniotes. Lissamphibians (i.e. modern amphibians like frogs, salamanders, and caecilians) also lack an intertemporal. Most Temnospondyli, temnospondyls lack an intertemporal, though several early groups like Edopoidea, edopoids, Dvinosauria, dvinosaurs, and various other basal taxa retain the bone. Tetrapod groups which do possess an intertemporal typically have it contact the parietal bone along its inner edge, the Postfrontal bone, postfrontal and postorbi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proterogyrinus Skull Diagram
''Proterogyrinus'' is an extinct genus of early tetrapods from the order Embolomeri. Fossil remains of ''Proterogyrinus'' have been found in Scotland, UK, and West Virginia, United States, and date back to the Serpukhovian (mid-Carboniferous period), which is from about 331 to 323 million years ago. The genus was originally named by renowned vertebrate paleontologist Alfred Romer, Alfred Sherwood Romer in 1970. A comprehensive redescription was later published by Canadian paleontologist Robert Holmes in 1984. The generic name "''Proterogyrinus''" is Greek language, Greek for "earlier wanderer" or "earlier tadpole". This name was chosen by Romer in keeping with a trend of naming long-bodied early tetrapods (such as ''Eogyrinus'' and ''Crassigyrinus'') with the suffix "-''gyrinus''". Romer hesitated from designating ''Proterogyrinus'' as a true embolomere, because its intercentra (the forward portion of each vertebra) were smaller than its pleurocentra (the rear portion). He used t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
