SUBPHYLUM TRILOBITOMORPHA (Tri, three + lobes, lobes)

SUBPHYLUM TRILOBITOMORPHA (Tri, three + lobes, lobes)

Members of the subphylum Trilobitomorpha were dominant in the oceans from the Cambrian period (600 million years ago) to the Carboniferous period (345 million years e ,o). They crawled along the substrate. They fed on annelids. molluscs, and decaying organic matter. Their bodies ware oval and flattened. Body was divided into three longitudinal regions. All their body segments could articulate. Thus trilobite could roll into a ball to protect its oval ventral surface. Most fossilized trilobites are found in this position. Trilobite appendages consisted of two lobes or rami. These are called biramous (bi, twice + ramus, branch) appendages. The Inner lobe was a walking leg. The outer lobe had spikes or teeth. These were used them in digging or swimming. These may be used as gills in gas exchange.


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