-
Ordovician and
became extinct at the end of the
Middle Silurian. All
raphiophorids are blind, with
headshields (or cephalons) that are
triangular to subcircular...
- that
lived during the late
Caradoc of
Inner Mongolia, China. Like all
raphiophorids it is blind, with a
headshield (or cephalon) that is subsemicircular...
- and
lacks the rapier-like
glabellar spine, that
occurs in many
other raphiophorids. The
Chinese species, by contrast, have only six
thoracic segments....
- is a
genus of
trilobites that
lived during the Ordovician. Like all
Raphiophorids it is blind, with a
cephalon that is
subtriangular to subsemicircular...
- the so-called Taklamakaniinae, a
paraphyletic group of tiny,
dwarfed raphiophorids that
lived in a
deepwater environment in what is now the
Tarim Basin...
- flask-shape. It
lacks the rapier-like
glabellar spine of many
other raphiophorids, but only has a tubercle. The
thorax has five segments. The
short but...
-
raphiophorids by the 3
thorax segments. Pseudampyxina, Taklamakania, and
Kongqiangheia also have only 3 such segments,
while all
other raphiophorid genera...
- China, and
possibly Tasmania.
Species of
Bulbaspis are
similar to
other raphiophorids such as
Ampyx and Raphiophorus, save that the long
spine that emanates...
- trilobites, that
lived during the Ordovician. It was eyeless, like all
raphiophorids, and had a long
straight sword-like
frontal spine, that
gradually transforms...
-
murrayi zone up to the ?Baltograptus
jacksoni zone. A long-spined
eyeless raphiophorid which often occurs in
distinctive linear clusters.
These clusters are...
