Most recent common ancestor.
That is, they are descendants of the most recent common ancestor of all synapsids, but not the most recent common ancestor of all mammals.
Using monophyly groupings comprising all descendent taxa and their most recent common ancestor (a.k.a.a
In other words, they are equally distant from their most recent common ancestor.
Non-mammalian synapsids are descended from the most recent common ancestor of all synapsids, and not the most recent common ancestor of reptiles, making them by definition part of a line of descent that is separate from all reptiles.
The prompts specifically concerned trait possession, synapomorphies, most recent common ancestry, monophyletic groups, taxa relatedness, and convergent evolution.
The correct answer was the taxon that shared a most recent common ancestor with the focal taxon.
A crown group refers to all descendants of the most recent common ancestor of the extant members of a clade.
The most recent common ancestor (MRCA) of all four species is indicated by a circle and small arrow.
Bayesian analysis of the E1 region was used to estimate the time of the most recent common ancestor (tMRCA).
Novas (1992) defined Herrerasauridae as Herrerasaurus, Staurikosaurus, and their most recent common ancestor.
