FIGURE 12.3. (A) Partial skeleton of a primitive
archosaurian relative of dinosaurs known as Euparkeria
from the Early Triassic of South Africa. (Photo by the
author) (B–D) The earliest and most primitive known
dinosaur, Eoraptor from the Late Triassic of Argentina.
(B) A complete articulated skeleton; (C) close-up of
the skull; (D) reconstruction of Eoraptor in life. (E)
Skull of Herrerasaurus, another primitive dinosaur
from the Late Triassic of Argentina. (Photos (B–E)
courtesy P. C. Sereno, University of Chicago)
(A)(B)(C) (D)
(E)