Dictionary > Synapsid

Synapsid

Synapsid refers to any of the animals belonging to class Synapsida. These animals first appeared in the late Permian period (299 to 251 million years ago). They are presumed to have evolved from the basal amniotes. They are characterized by having temporal fenestra (i.e. the temporal opening on the sides of the skull), front teeth different from the back teeth, and limbs under the body. Mammal-like synapsids are now referred to as stem mammals or proto-mammals. Many of them became extinct by the Permian-Triassic extinction. Those that survived led to the more advanced therapsids. Cynodonts including Mammaliaformes were the only synapsids to survive after the Triassic period.

See also

References

  1. “New proto-mammal fossil sheds light on evolution of earliest mammals”. (August 7, 2013). University of Chicago. Retrieved from http://www.uchospitals.edu/news/2013/20130807-megaconus.html
  2. Greatest mass extinction responsible for the making of modern mammals. Retrieved from http://www.nasmus.co.za/museum/news/greatest-mass-extinction-responsible-making-modern-mammals

© Biology Online. Content provided and moderated by Biology Online Editors



You will also like...

Cell Biology
Cell Biology

The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

Genetic engineering
Genetic Engineering Advantages & Disadvantages

This tutorial presents the benefits and the possible adverse eventualities of genetic engineering. Know more about this ..

Transpiration
Water in Plants

The movement of molecules (specifically, water and solutes) is vital to the understanding of plant processes. This tuto..

Peppered moth ("Biston betularia") melanic and light form
Examples of Natural Selection

Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..

temperature - abiotic factor
Abiotic and Biotic Factors

This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

river
Running Water Freshwater Communities

This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..