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Exploring Invertebrate Chordates: Fascinating Underwater Creatures

Dive into the world of invertebrate chordates, which include Hemichordates, Urochordates, and Cephalochordates. Learn about their unique characteristics, such as gill slits, dorsal nerve cord, and distinctive classes like Enteropneusta and Pterobranchia. Discover the wonders of acorn worms, tunicates, and lancelets as you explore these fascinating shallow marine animals. Whether it's the colonial nature of Hemichordates or the filter-feeding habits of tunicates, this journey will unveil the intriguing world of invertebrate chordates. Let's embark on this educational marine adventure together!

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Exploring Invertebrate Chordates: Fascinating Underwater Creatures

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  1. Invertebrate Chordates Hemichordata Urochordata Cephalochordata

  2. Hemichordates • Deuterostomes • Gill slits • Dorsal nerve cord

  3. Classes of Hemichordates • Enteropneusta • Acorn worms • Shallow marine animals • Pterobranchia • Rhabdopleura • Colonial, send out feeding zooids

  4. Acorn Worm

  5. Phylum Chordata • All chordates are deuterostomes • At some time in their life, all chordates have: • Notochord • Pharyngeal gill slits • Dorsal, hollow nerve cord • Postanal tail

  6. Subphylum Urochordata • Sea squirts or tunicates • Larvae show the characteristics of chordates • Adults lose notochord, nerve cord, and tail • Only animals to have cellulose in their bodies!

  7. Tunicates: • Are filter feeders • Do not have complex nervous systems • Often form large colonies • Are monoecious

  8. Tunicate Larva

  9. Adult tunicates

  10. Subphylum Cephalochordata • Lancelets (Amphioxus) • Notochord runs from head through tail • Muscles can contract the notochord • Live partially buried in marine sediment • Filter feeders • Dioecious

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