- present. (The librigena, or ch**** spines,
detach during moulting.) In
ptychopariids,
short bladelike genal spines are
often present on the tips of the librigena...
-
ptychopariid (specific name may be
confused with Alokistocare)
Alokistocare harrisi -
alokistocarid ptychopariid Asaphiscus wheeleri -
ptychopariid;...
-
Olenus is a
genus of
Upper Cambrian ptychopariid trilobite.
Olenus can be
found in the
British Isles, India, Norway, Sweden, Denmark, Newfoundland, Texas...
-
Olenidae is a
family of
ptychopariid trilobites. Some genera,
Balnibarbi and Cloacaspis, are
thought to have
evolved a
symbiotic relationship with sulfur-eating...
-
Quitacetra arenata is a
species of
ptychopariid trilobite arthropod from Late Cambrian-aged
deposits in
Quita Cr****, Queensland. Sepkoski, Jack (2002)...
-
Cloacaspis is an
extinct genus of
Olenid Ptychopariid trilobite. It
lived during the
early part of the
Arenig stage of the
Ordovician Period, a faunal...
-
Lisania is an
extinct genus of
ptychopariid trilobites, and is the type
genus of the
family Lisaniidae. It
lived during the
Cambrian Period,
which lasted...
-
earliest trilobites known from the
fossil record are
redlichiids and
ptychopariid bigotinids dated to
around 520
million years ago.
Contenders for the...
-
Sailycaspis is an
extinct genus of
ptychopariid trilobites of the
family Ellipsocephaloidea . It
lived during the
early part of the
Botomian stage, which...
-
Cambroproteus is a
genus of
ptychopariid trilobite from the Late
Cambrian of Morocco. It has a
single known species,
Cambroproteus lemdadensis,
whose various...
