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Triodus
Triodus
is an
extinct
genus
of xenacanthidan
shark
that lived from the
Carboniferous
to the
Triassic
. It was a
freshwater shark
, and fossils have been found in the
Chinle Formation
and
Black Prince Limestone
of
Arizona
, the
Petrified Forest Member
of
New Mexico
and the
Tecovas Formation
of
Texas, United States
. In
2017
, a
new species
Triodus richterae
was described from the
Rio do Rasto Formation
of
Brazil
.
