-
dorsal sutures is
proparian.
Opisthoparian sutures have
developed several times independently.
There are no
examples of
proparian sutures developing...
-
other trilobites,
dorsal sutures may be opisthoparian, gonatoparian,
proparian or they may be lost secondarily. The
absence in the
fossil record of the...
-
Trilobite facial sutures can be
roughly divided into
three main
types (
proparian, gonatoparian, and opisthoparian)
according to
where the
sutures end relative...
-
lateral lobe l p.
Facial sutures gonatoparian (exceptionally, can be
proparian in Flexicalymene).
Genal spines absent.
Hypostome without discrete protuberance...
-
Glabella Gonatoparian Heteronomous Homonomous Hypostome Isopygous Librigena Macropygous Micropygous Opisthoparian Proparian Prosopon Spinosity Subisopygous...
- from
proparian to gonatoparian.
Although this
development has also been
observed in
Duyunaspis duyunensis, it is
really uncommon. Usually,
proparian holaspid...
-
explained by paedomorphosis, such as the
small number of
thorax segments and
proparian facial sutures, that
occur in all
trilobites during larval development...
-
Glabella Gonatoparian Heteronomous Homonomous Hypostome Isopygous Librigena Macropygous Micropygous Opisthoparian Proparian Prosopon Spinosity Subisopygous...
-
their oval shape,
small size (less than 1
centimetre or 0.39 inches),
proparian sutures, and non-functional
articulations of the thorax.
Uniquely the...
- (with
sutures in
Pliomera gonatoparian) is an
exception in the
otherwise proparian Cheirurina. The
thorax has 11 or 12 segments, with the axis
slightly wider...
