EVERYDAY SCIENCE

Detailed explanation-1: -Anapsids lack temporal fenestrae. Diapsids have two fenestrae on each side and evolved from ancestors that had none. Snakes, lizards, crocodiles, and dinosaurs are diapsids. Testudamorpha (turtles and tortoises), as well as many Paleozoic reptiles, are anapsids.

Detailed explanation-2: -In the typical diapsid skull, the temporal area has two openings called fenestrae, an upper one between the parietal and the postorbital–squamosal, and a lower one between the squamosal and jugal–quadratojugal.

Detailed explanation-3: -They are amniotes that developed two temporal fenestra or skull holes about millions of years ago. Here, two holes are present on each side of the skull. Diapsids include organisms like lizards, snakes, crocodiles, turtles, tuatara and birds.

Detailed explanation-4: -Anapsids have no openings, synapsids have one opening, and diapsids have two openings. Temporal fenestrae are post-orbital openings in the skull that allow muscles to expand and lengthen. Anapsids have no temporal fenestrae, synapsids have one, and diapsids have two.

Detailed explanation-5: -Modern diapsids include lizards, snakes, turtles, birds, and crocodylians; extinct diapsids include dinosaurs, pterosaurs, ichthyosaurs, and many other familiar taxa. The stem-based name Diapsida is derived from the presence of a pair of fenestrae in the temporal region of the skull.