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Lecture 54

BIOL 1010 Lecture 54: Lecture 54

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

c82 Bio 1010 Post-anal tail (Muscular, posterior to anus) Tunicate & Lancelet are both invertebrate chordates due to not having a backbone. Adult Tunicates are stationary & look like small sacs. ------------ ----------- ------ o Adhere to rocks & boats, common on coral reefs. o Adult has no notochord, nerve cord, or tail but has pharyngeal slits functioning for feeding. o Tunicate larva is a swimming, tadpole-like with all 4 distinctive chordate features. o Suspension feeders o Seawater enters the adult through opening at the top, passing through the pharyngeal slits into large cavity of animal, & exits back into ocean via excurrent siphon on side of body. Food particles are trapped in net made of mucus & transported to intestine, where digested. Because they shoot jet of water through excurrent siphon when threatened, tunicates are often called sea squirts. Lancelets feed on suspension particles. ---------------------------------- ---------- o Small & blade-like chordates living in marine
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