- The
articulate middle part of the body (or thorax) has 16 segments. The
tailshield (or
pygidium has a
spatulate shape. Whittington, H. B.; et al., eds. (1997)...
- China, Sweden, the
Russian Federation, and Kazakhstan. Its
headshield and
tailshield are
almost completely effaced and it has two
thorax segments. T. bituberculatus...
- area. The
articulating middle part of the body has 12
segments and the
tailshield carries two long, tubular,
curved pygidial spines that are reminiscent...
- 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...
-
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...
- (Newfoundland). It can be
recognized by its
strongly effaced headshield and
tailshield, with
narrow but
distinct furrows and
borders along its margins, and three...
- eyes, long
genal spines, 12
spined thorax segments and a small,
short tailshield, with four
pairs of spines. It
lived during the Late
Cambrian in what...
- 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...
- 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...
- The
exoskeleton is
rounded anteriorly, with the
thorax and
sides of the
tailshield (or pygidium)
slightly tapering to
about 2⁄3× of the
width across the...
