Presentation on theme: "PHYLUM CHORDATA THREE COMMON CHARACTERISTICS"— Presentation transcript:
1 PHYLUM CHORDATA THREE COMMON CHARACTERISTICS I. NOTOCHORD; a cartilage supportrod 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)
3 SUBPHYLUM UROCHORDATA CLASS ASCIDIA; Sea squirtssessile filter feeders on dock floats and dock pilings.CLASS THALIACEA; Tunicatescolonial, sessile and pelagic filter feedersSalps, pelagic, transparent barrel shaped filter feeders.