Noun
The word is derived from fenestra
of Fenestra
Source: Webster's dictionaryProfile view of a skull (AMNH 5027) The largest known Tyrannosaurus rex skulls measure up to convert in length. citation Large fenestrae (openings) in the skull reduced weight and provided areas for muscle attachment, as in all carnivorous theropods. Source: Internet
Those four subclasses were: * Anapsida – no fenestrae – cotylosaurs and Chelonia ( turtles and relatives) This taxonomy does not reflect modern molecular evidence, which places turtles within Diapsida. Source: Internet
The skull also included forward-pointing nasals—something different to any dinosaur—and fenestrae differing from the drawing and other skulls. Source: Internet