& Chatterton, 1988)
The Asaphida covers almost 20% of all species of the
TRILOBITA and therefore it's featuring various morphologies. The advanced
families are associated by an similiar
The Asaphida are covering the superfamilies
The image shows a
representative of the superfamily Asaphoidea (Family Asaphidae).
(Source: Trilobites, Levi-Setti,
Cambrian to Upper
With exception of the representatives of
Trinucleioidea, whose cephalon is
developed larger than their pygidium, cephalon and pygidium are equal in
size. The size of the glabella diversifies from small to huge, depending
on the families, glabellar furrows are barely or or even not at all
are running ophistoparian. A broad doublure is present. The eyes (predominantly
large developed) are present, with exception of the secondary blind
species. The freecheeks are typically separated by a median
ventralsuture. The primitive species of Asaphida featuring a
hypostome, in opposite to the higher species, whose are featuring the
or impendent type.
development is varying and the thorax consits of 2- 30 segments.
some representatives of Trinucleioidea and
Remopleuridoidea (smaller pygidium) the
pygidium is developed equal in size or even larger than the cephalon.