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Understanding Chordates: Characteristics and Classes

Explore the key features of chordates - notochord, dorsal nerve cord, pharyngeal gill slits - and classes like Ascidia, Tunicates, Lancelets, and Jawless Fishes in Vertebrates.

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Understanding Chordates: Characteristics and Classes

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

  2. SUBPHYLUM UROCHORDATA • CLASS ASCIDIA; Sea squirts • sessile filter feeders on dock floats and dock pilings. • CLASS THALIACEA; Tunicates • colonial, sessile and pelagic filter feeders • Salps, pelagic, transparent barrel shaped filter feeders.

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

  4. SUBPHYLUM VERTEBRATATHE VERTEBRATES • VERTEBRAL COLUMN of bone or cartilage. • SKULL enclosing brain etc.

  5. CLASS AGNATHAThe Jawless Fishes • LAMPREYS; salt and freshwater parasites on other fishes. • HAGFISH; deeper water scvengers and parasites.

  6. Lamprey

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