Systematic position
Kingdom: Animalia
Sub-kingdom: Eumetazoa
Super-phylum: Ecdysosoa
Phylum: Arthropoda
Sub-phylum: Trilobitomorpha
Trilobite (Source Wikipedia)
Trilobitomorpha Characteristics
Ø Primitive arthropods
Ø Extinct forms
Ø Abundant during Paleozoic era
Ø Body is divided into three lobes, hence the name trilobitomorpha
Ø Body is divided into a median and two lateral lobes by a longitudinal axial furrow
Ø Body division: head, abdomen and pygidium (pygidium = posterior body part of some insects and members of extinct trilobites. It is separated from the thorax by articulation. Pygidium contain anus and in females it also contains the ovipositor)
Ø Head bears a pair of antenna and eyes
Ø Eyes were compound
Ø Appendages biramous
Ø Structural differentiation of body parts absent
Classification of Trilobitomorpha:
Sub-phylum Trilobitomorpha include a single class Trilobita (all are extinct forms)
Classification of Trilobitomorpha
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