- (or pleurae) are furrowed, and the
articulating facets distinct. The
tailshield (or pygidium) is
always smaller than the
headshield (or cephalon), a situation...
- may have an exta
large and wide rib (a
state called macropleural). The
tailshield (or pygidium) is
small but
appears to be
composed of more than one segment...
- adorned. The
posterior bands have a row of
distinct small spines. The
large tailshield (or pygidium) has 11
pairs of
spines along the edge, and one in the middle...
-
genal spines, 5
thorax segments also
ending in
stubby genal spines, and a
tailshield (pygidium) with a pair of m****ive tusk-like spines, and two
smaller spines...
-
anterior segment to
slightly pointing inwards for the
posterior segment. The
tailshield (or pygidium) is large, subtriangular, and
about ⅔-¾× as long as wide...
-
agnostid trilobite. It has a
headshield (or cephalon)
wider than the
tailshield (pygidium), and in
between them
three thoracic body
segments (somites)...
- oval or semi-circular
headshield (cephalon), and a
circular to long oval
tailshield (pygidium)
equal to or
longer than the cephalon,
without any body segments...
- laterally. This so-called
vindicular furrow serves to lock the rim of the
tailshield to the
headshield when the
trilobite is enrolled. The
axial rings of the...
- sickle-shaped
spines that to the back
curve increasingly further backwards. The
tailshield (or pygidium) is small. HAWLE, J. & CORDA, A. J. C. 1847.
Prodrom einer...
-
reaches beyond the back end of the exoskeleton. It has an
almost oval
tailshield with 5
pairs of
pleural furrows. It
lived during the
Upper Cambrian in...