The meaning of PARAPSIDA is a subclass of reptiles in which the skull has two dorsal temporal openings adjoining the parietals and which includes the ichthyosaurs and related extinct forms and sometimes the lizards and snakes.

Euryapsida is a polyphyletic (unnatural, as the various members are not closely related) group of sauropsids that are distinguished by a single temporal fenestra, an opening behind the orbit, under which the post-orbital and squamosal bones articulate.

2024年2月13日 · Reptilia is divided into anapsida, parapsida and diapsida. Reptilia has both ecological and economic importance. What is Reptilia? Reptilia is a class of cold-blooded vertebrates. It includes snakes, lizards, turtles, and crocodiles. Reptilia is characterized by scales, lungs, and laying shelled eggs. Reptiles have a diverse range of habitats.

2024年4月12日 · The Parapsida, an extinct subclass of reptiles, possessed unique skull characteristics that set them apart from other reptilian subclasses. Here are some key features of the Parapsida subclass based on the presence of a single dorsolateral temporal opening on either side, bounded below by the supratemporal and postfrontal bones:

Reptilia # Subclass Parapsida (extinct, aquatic): 1. A pair of dorsal openings (fenestrae) in the skull. 2. Most show two pairs of paddle like limbs. 3. The skull usually drawn to a long tapering rostrum. Examples. Ichthyosaurus, Plesiosaurus, etc. Reptilia # Subclass Diapsida:

2023年5月19日 · Parapsida: Reptiles belonging to the Parapsida subclass have a skull with a single temporal fossa located high up on the skull. Some reptiles that fall under this subclass include Protosaurs, Nothosaurs, and Placodonts.

There are about 10000 different species of reptiles on earth. They are cold-blooded animals belonging to the phylum Chordata of Animal kingdom. The skull of the reptiles is modified that gives the reptiles an efficient and powerful jaw action. The modification also makes the skull light.

Parapsida — The skull possesses an upper opening in which the post-orbital and squamosal meet below. 3. Diapsida — In this case there are two openings on each side, separated by pos- torbital and squamosal bones. 4. Synapsida — In this group a single opening is present with postorbital and squamosal meeting above.