The Deuterostome lineage

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Presentation transcript:

The Deuterostome lineage Echinodermata The Deuterostome lineage

Echinoderm attributes Penta-radial symmetry Water-vascular system Nature of integument (spinosous) Coelomic space separate and distinct from vascular system Larval and adult stages occupy different habitats (metamorphosis)

Echinoderm classsification Crinoidea--sea lillies Stelleroidea--star shaped Asteroidea-sea stars Ophiuroidea-brittle stars Echinoidea-regular irregular urchins Holothuroideasea cucumbers

Water-Vascular system Components Tube feet Radial canals Circular canal Stone canal Madreporite Modified in other orders for different purposes

Coelomic space Respiration-dermobranchiae Skeleton Space reproduction

Nervous system Sub-epithelial nerve net Deep system

Patterns of development Metamorphosis Dipleurula larva