- A cranidium, the
remainder of the
cephalon after the
librigenae have
broken away...
- from the
front of the
glabella to the small, outwardly-bowed eyes. The
librigenae narrow backward into straight,
slender genal spines that
reach as far...
- the sides.
Complete specimens of
Paradoxides have been
found with the
librigenae and
fused rostral-hypostomal plate. In moulting, the body was
arched above...
- in
front of the
inflated glabella and
consequently the free ch****s (or
librigenae) are
yoked as a
single piece. The part of the
skeleton that is ‘tucked...
- in
front of the
inflated glabella and
consequently the free ch****s (or
librigenae) are
yoked as a
single piece. In some of the
eyeless genera (Ductina)...
- from the
central part of the
headshield or cranidium, so free ch****s (or
librigenae),
thorax and
pygidium are unknown. Exigua, is
Latin meaning small, meager...
- glabella. The
palpebral lobes are
short but
prominently raised, and the
librigenae tiny. The
anterior border usually is a
short rim
marginal to a long border...
- cyclopygids, it has huge eyes, that
occupy almost the
entire free ch****s (or
librigenae), six
thorax segments and a wide tail shield. Like the
other cyclopygids...
- from the
front of the
glabella to the small, outwardly-bowed eyes. The
librigenae narrow backward into straight,
slender genal spines that
reach as far...
-
another obvious feature of the cephalon. When
trilobites moulted, the
librigenae ("free ch****s")
separated along the
facial suture to ****ist moulting,...
