In biology the meaning of morphology is the theory of the appearance of life
forms. The term morphology is deduced from the Greek (morphé = shape and
lógos = word, theory). Quarry through the following pages comprising the
basic morphology of our trilobites, and become acquainted with the
characteristic features, structures as well as the habitats of Trilobita's
The soft partial preservation at the fossil trilobites isn't
in general existing. Even exoskeletons elementary basic elements like
calcite, chitin and calcium phosphate are due to it's specific chemical and also
physical characteristics (e.g. acid resistance, temperature dependence,
weathering resistance etc.), there's no 100% guarantee for successfully
processing of fossilization.
The trilobite was solely dorsal (Lat. dorsum- the back) armored. Visualized the dorsal shield is comparable to a bowl, the little
invertebratet carried around, dorsal- sided fitted in. The dorsal shield ends
abruptly in an edge, the doublure, circumferential along the complete dorsal
shields perimeter. Ventral sided (Lat. venter- the abdomen) the trilobite was
nearly unarmored. A hard mouthpart typically underlies the Glabella, called
hypostome, constituting the sole ventral armor segment. The relationship
concerning attachment from the ventral structure
hypostome to the rostral plate
is in addition to
hypostomes formation an important factor in trilobite
classification. Cause of the
hypostome, trilobites brain and stomach were
shielded at dorsal- as well as ventralsided.
Due to the
exoskeleton, in the course of body growth's process. the trilobite had
to submit to the ecdysis for several times, the molting. After shedding the old
partial structures), or even the trilobites
decease, the level of conservation was basically determined by the process of
fossilisation (death, biostratonomy,
diagenesis). Thus it`s exceedingly
difficult to estimate, if one's handling a structure of a molting process or
even a cadaver's part at last. Apart from this, the basic knowlegements about
exoskeleton representing the entrance into trilobites benthos.
Verbalized significantly by the name 'Trilobite', trilobites body is divided
both transverse- and longitudinal orientated into three major sections
(trilobite - 'three lobed'). Considering as Metacanthina barrandei this
tripartition should be claryfied.
The rised axis (using the term backbone defining invertebrates body is a little
bit tricky) running the length of the trilobites body from pygidium beyond
thorax and finally cranial transferring into the glabella. The rachis is divided
into several segments. Each of this segments per one pleura (Gr.- side, flank)
is bilateral assigned (thoracic segments) The pleural furrow is running along
The cephalon (Gr.
- head) consist of several regions, which are separated from each other by
facial stitches (suturae).
The single thorax
segments (number depending on order 2.. = 15) are connected to each other over
exoskeleton therefore has an essential flexibility (e.g. for enrollment).
At pygidium this articulations are missing, that means the single segments are
rigidly coupled, forming trilobites pygidial shield.