Among the largest dinosaur species were the apathosaurs and bra-
chiosaurs, which lived around 100 million years ago. Paralititan, meaning “tidal
giant,” was the second largest dinosaur, measuring 100 feet in length and
weighing 75 tons. It resembled apathosaurs and lived in a lush coastal region
94 million years ago. Perhaps the tallest and heaviest dinosaur thus far discov-
ered was the 80-ton Ultrasaurus,which could tower above a five-story build-
ing.Seismosaurus,meaning “earth shaker,” was the longest known dinosaur. It
reached a length of more than 140 feet from its head, which was supported by
a long, slender neck, to the tip of its even longer whiplike tail.Giganotosaurus
(Fig.151) even challenges Tyrannosaurus rexas the most ferocious terrestrial
carnivore that ever lived.
Large reptiles possess the power of almost unlimited growth. Adults
never cease growing entirely but continued to increase in size until disease,
accident, or predation takes their lives. The giant Komodo dragon lizards of
southeast Asia, for example, grow to over 300 pounds and prey on monkeys,Figure 151
Giganotosauruswas the
largest carnivorous
dinosaur.
Historical Geology