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Species Names: Ciona intestinalis Oikopleura Branchiostoma (Amphioxus).

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Presentation on theme: "Species Names: Ciona intestinalis Oikopleura Branchiostoma (Amphioxus)."— Presentation transcript:

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3 Species Names: Ciona intestinalis Oikopleura Branchiostoma (Amphioxus).

4 Urochordata – marine subphylum of chordates Sea squirts (eg. Ciona), pelagic forms (eg. Oikopleura) Cephalochordata – marine subphylum of chordates - lancelets

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6 Explosion of invertebrate evolution in the lower Cambrian period (Beginning 570 million years ago) - lasted 10 million years. - Melting glaciers => more water/places to live Retinoic acid (a vitamin A-deirved morphogen) a possible component for their evolution. => too much or too little of it during embryo development could lead to mutations => evolutionary change Evolved from lancelets Notochord ( a cartilaginous rod along the back) No jaws

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8 At some point in the invertebrate chordate life they have… A flexible, fibrous notochord that gives support. A hollow dorsal nerve cord in the back. Gill slits in the pharynx (throat area). Muscular tail which prolongs past the anus. (for locomotion and balance).

9 Urochordata Endoskeleton Cephalochordata Endoskeleton Endoskeleton- an internal skeleton made of bone or cartilage.

10 Urochordata are filter feeders. 1.) Water enters into the incurrent siphon 2.) It goes to the slits in the pharynx 3.) Food filtered by the pharynx moves to the stomach 4.) Undigested moves to anus 5.) And exits through excurrent siphon.

11 Cephalochordata are also filter feeders. 1.) Water is drawn by cilia into the mouth. 2.) It moves to the pharynx. 3.) The pharynx traps food particles from the water. 4.) Food enters the intestine for digestion 5.) The water leaves through atriopore. (An opening in the body).

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22 Pike - Worlds first known chordate - large carnivorous, bony fish - genus Esox in the family Esocidae.

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27 - Fish: the first vertebrates. - Example: Myllokunmingia, found from fossil deposits in China. -Earliest fish - lampreys and hagfishes -Ordovician period -jaws -=> major advancement -Earliest jawed fishes were covered in bony armor b/c of strengthening predatory race. => Placoderms => extinct - Jawed fishes that survived became: ChondrichthyesChondrichthyes (cartilaginous fishes) Osteichthyes (bony fishes). Osteichthyes

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48 - About 99% of the animals in the world are invertebrates? -They are usually darker color on the top and lighter on the bottom to protect them from predators/enemies. - Their body shape is streamlined to allow it to move through water more rapidly. -They can change their color in an instant with color and reflective cells in their pigmentation! -Scales protect the fish and reduce the friction while they swim. -Fish are very diverse species… -Size range from 1 inch to 16 feet long!!! -They can be almost any color in nature

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50 Atlantic Hagfish Sea and sky Sea and Sky. 04 Apr "Coelacanth." UXL Encyclopedia of Science. Ed. Rob Nagel. Vol nd ed. Detroit: UXL, Gale Virtual Reference Library. Gale. VERNON HILLS HIGH SCHOOL. 7 Apr Hagfish. Aquatic Community Aquatic Community.com. 04 Apr "Hagfish." Encyclopædia Britannica Encyclopædia Britannica Online. 02 Apr http://www.britannica.com/EBchecked/topic/251522/hagfish Hine, Robert. "Chordata." The Facts On File Dictionary of Biology, Fourth Edition. New York: Facts On File, Inc., Science Online. Facts On File, Inc. FDBF0554&SingleRecord=True (accessed April 7, 2009). "Invertebrate Nervous System." Neuroscience for Kids. 12 Apr Lobe-Finned Fishes. Natural History Notebooks. Canadian Museum of Nature. 23 Mar Apr Marlétaz F, Holland LZ, Laudet V, Schubert M. Retinoic acid signaling and the evolution of chordates. Int J Biol Sci 2006; 2: Available from "Nervous System - Evolution Of Invertebrate Nervous Systems." 12 Apr "Paleontology." The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. Vol th ed. Detroit: Gale, Gale Virtual Reference Library. Gale. VERNON HILLS HIGH SCHOOL. 7 Apr "Pike." The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. Vol th ed. Detroit: Gale, Gale Virtual Reference Library. Gale. VERNON HILLS HIGH SCHOOL. 7 Apr Postlethwait, John, and Janet Hopson. Modern Biology. Austin: Holt, Rinehart and Winston, Print.Schlager, Neil. Grzimek's AnimalLife Encyclopedia Fishes 1. 2nd ed Shark Diet and Drinking. Enchanting Learning Enchanting Learning Software. 05 Apr Shark Digestion. Enchanting Learning Enchanting Learning Software. 05 Apr "The Invertebrate Animals." 15 Jan Apr 2009.


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