-
Librostoma is a
subclass of
trilobites defined by
having a
natant hypostome,
which is a
hypostome (mineralized
trilobite mouthpart) that is free from the...
- some
species the
pygidium is
outlined with a flat border. The
Subclass Librostoma was
recently erected to encomp****
several related orders,
including Ptychopariida...
-
recently given their own
order (Ebach &
McNamara 2002). The
subclass Librostoma was
erected in 1990 by
Richard Fortey to
cover the
various orders originally...
- with the
order Ptychopariida,
though it is not
included in the
subclass Librostoma.
Phacopida was one of only two
trilobite orders (along with the Proetida)...
- and
Harpetida were
grouped together as
order Ptychopariida;
subclass Librostoma was
erected in 1990 to encomp**** all of
these orders,
based on
their shared...
-
Ptychopariida in some features, the
proetids are
included in the
subclass Librostoma.
Unlike the
trilobites of the
phacopid suborder Phacopina,
whose eyes...
-
Proetoidea is a
superfamily of
trilobites in the
order Proetida. The
Proetoidea are
closely related to the Aulacopleuroidea. and are
divided into three...
-
Hedstroemia is a
genus of
trilobites in the
order Proetida known from the
Silurian period of Europe, Asia, and
North America. The
genus Hedstroemia was...
-
Dechenella is an
extinct genus of
trilobites from the Devonian. It has been
reported from America, Canada, Alaska, Germany, Italy,
Czech Republic, Iran...
-
Hibbertia is a
genus of trilobites. A new species, H. aodiensis, was
described from the late
Ordovician of
China by Dong-Chan Lee in 2012. Dong-Chan Lee...
