- Agnostida,
Oodiscus is
diminutive and the
headshield (or cephalon) and
tailshield (or pygidium) are of
approximately the same size (or isopygous) and outline...
- Agnostida,
Bolboparia is
diminutive and the
headshield (or cephalon) and
tailshield (or pygidium) are of
approximately the same size (or isopygous) and outline...
- Agnostida,
Weymouthia is
diminutive and the
headshield (or cephalon) and
tailshield (or pygidium) are of
approximately the same size (or isopygous) and outline...
- China, Sweden, the
Russian Federation, and Kazakhstan. Its
headshield and
tailshield are
almost completely effaced and it has two
thorax segments. T. bituberculatus...
- 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...
- 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)...
- 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...
-
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...
- area. The
articulating middle part of the body has 12
segments and the
tailshield carries two long, tubular,
curved pygidial spines that are reminiscent...
- (the doublure) has no
sutures crossing it to form a
rostral plate. The
tailshield (or pygidium) is
always smaller than the
headshield (or cephalon), a situation...
