The first amniotes apparently arose in the Late Carboniferous. They descended from earlier reptiliomorph amphibious tetrapods, which lived on land that was already inhabited by insects and other invertebrates as well as by ferns, mosses and other plants. Within a few million years, two important amniote lineages became distinct: the synapsids, which would later include the common ancestor of the mammals; and the sauropsids, which would eventually come to include turtles, lizards, snakes, crocodilians, dinosaurs and birds. Synapsids have a single hole (temporal fenestra) low on each side of the skull. COUNT 5
QSN1 From which period did the first known amniotes arise from? ANS1 Carboniferous QSN2 From which group did amniotes descendents of? ANS2 reptiliomorph amphibious tetrapods QSN3 Two important Amniotes  lineages became distinct, what was the name of that distinction? ANS3 the synapsids QSN4 Sauropsids would later include which other animals into its group? ANS4 turtles, lizards, snakes, crocodilians, dinosaurs and birds QSN5 What is a distinct trait of Synapsids? ANS5 single hole (temporal fenestra) low on each side of the skull