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PHYLUM CHORDATA n THREE COMMON CHARACTERISTICS n I. NOTOCHORD; a cartilage support n rod sometime during development. n II. DORSAL NERVE CORD ;central.

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Presentation on theme: "PHYLUM CHORDATA n THREE COMMON CHARACTERISTICS n I. NOTOCHORD; a cartilage support n rod sometime during development. n II. DORSAL NERVE CORD ;central."— Presentation transcript:

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2 PHYLUM CHORDATA n THREE COMMON CHARACTERISTICS n I. NOTOCHORD; a cartilage support n rod sometime during development. n II. DORSAL NERVE CORD ;central nerve or spinal cord along the back. n III. PHARYNGEAL GILL SLITS; Pharynx=throat region, some time during development (embryo)

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4 SUBPHYLUM UROCHORDATA nCnCnCnCLASS ASCIDIA; Sea squirts n s essile filter feeders on dock floats and dock pilings. nCnCnCnCLASS THALIACEA; Tunicates n c olonial, sessile and pelagic filter feeders n S alps, pelagic, transparent barrel shaped filter feeders.

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7 SUBPHYLUM CEPHALOCHORDATA n LANCELETS; Amphioxus, small fish like ancestors of vertebrates. n Filter feeders living in sandy bottoms.

8 SUBPHYLUM VERTEBRATA THE VERTEBRATES n VERTEBRAL COLUMN of bone or cartilage. n SKULL enclosing brain etc.

9 CLASS AGNATHA The Jawless Fishes n LAMPREYS; salt and freshwater parasites on other fishes. n HAGFISH; deeper water scvengers and parasites.

10 Lamprey

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