In an influential 1988 paper, Timothy Rowe defined Mammalia phylogenetically as the crown group mammals, the clade consisting of the most recent common ancestor of living monotremes (echidnas and platypuses) and therian mammals (marsupials and placentals) and all descendants of that ancestor. Since this ancestor lived in the Jurassic period, Rowe's definition excludes all animals from the earlier Triassic, despite the fact that Triassic fossils in the Haramiyida have been referred to the Mammalia since the mid-19th century. COUNT 3
QSN1 Who defined mammalian as the crown group mammals? ANS1 Timothy Rowe QSN2 By Rowe's definition, when did he start to exclude animals? ANS2 Triassic QSN3 Which group do marsupials and placentals belong to? ANS3 therian mammals