notes1 - Subphylum Urochordata- Tunicates or Sea Squirts I....

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Subphylum Urochordata- Tunicates or Sea Squirts I. Adult “sea squirt” a. Lifestyle- marine, adults- mostly sessile( 2 groups that aren’t) i. Sessile- don’t’ move, attached to substrate ii. Tunic- tunicin b. Feeding- incurrent siphon pharynx, lined with cilia i. food- retained in the guts ii. water- out pharyngeal slits atrium iii. endostyle mucous, cells that bind iodine to protein iv. food moves through gut. Anus opens into atrium v. Atrium- water from pharynx waste from guts vi. Egg and sperm from gonads… all to sea through excurrent siphon II. Tunicate larva--- more informative a. Tadpole- tail, swim i. tail-(post anal) contains a notochord 1. nerve chord- above notochord 2. muscle cells (swimming) ii. Verve Chord- hollow, dorsal-enlarged at ant 1. .brain – ocellus- light 2. brain- statocyst- position iii. pharyngeal slits- doesn’t feed III. Metamorphosis a. settles—on head b. loses tail- pulling in, and resorbed it c. Has chordate characteristics as larva but loses most of them at metamorphosis How did the chordates arise? Are they groups among invertebrates that show similar characteristics? Phylum- Hemichordata (acorn worm)
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notes1 - Subphylum Urochordata- Tunicates or Sea Squirts I....

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