Trilobitomorpha (Trilobites) General Characters (Phylum Arthropoda)


Trilobite Arthropode

Trilobite (Source Wikipedia)

Systematic position: 

Kingdom: Animalia
Sub-kingdom: Eumetazoa
Super-phylum: Ecdysosoa
Phylum: Arthropoda
Sub-phylum: Trilobitomorpha

General Characters of Trilobitomorpha

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)

How trilobitomorpha is classified

Classification of Trilobitomorpha


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