First dinosaurs involved
Evolution of the First Dinosaurs
Throughout history, the debate over the origin and the true
characteristics of dinosaurs have been rife. They are believed to belong to
a group of species known
as archosaurs, which
are have been described as among the
most successful groups of animals to have graced the planet (Reynolds, 2017). It is argued that the dinosaurs dominated the face
of the earth for over 160 million years and included small creatures and
the largest animals ever to have explored the earth (Brusate et al., 2010). However,
despite their long evolutionary
history, the origin
of the
first dinosaurs remains a mystery. This has led to the ongoing debate
over their origin, life history, and extinction among their other related
questionable aspects. Nonetheless, various
research studies have provided detailed synthesis about the dinosaurs, though
with numerous challenges.
Defining and classifying dinosaurs have been
among the challenges encountered by researchers of different
centuries. According
to Baron et al. (2017), the definition and
classification of dinosaurs have
been based on the configuration of their pelvis.
Specifically, there have been 2 major groups of the dinosaurian order, namely
the ornithischian and
the Saurischia. Various sub-group under archosaurs highly experienced
evolution during the Triassic period. During the Triassic period, new
land vertebrates, as well as the first mammals, are known to have appeared. However, the
dinosaurs were the latecomers into this era of radiation and evolution. The
first true dinosaur might have appeared after 230 million years, in the late
Triassic according to Brusate et al. (2010). They appeared to
have evolved from the reptiles and the Plateosaurus,
a plant-eating dinosaur was among the first to appear. Many of them were characteristically
small animals who inhabited warm and seasonal places on Earth. However, the Plateosaurus dinosaur was large,
approximately 9 meters in length. However, due to volcanic activities, about
200 million years later, the dinosaurs were cleared from the face of the Earth
and the lineage of the archosaurs. Nonetheless, they persisted into the
Jurassic period, which marked the beginning of their ecological dominance.
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