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Cephalochordata

Cephalochordata. By Aleasha Connors, Molly Labenski, Savannah Turple, & Rose Walls. Introduction. Lancelets or amphioxus Buried in sand Crucial in morphology and evolution 26 species. Evolution of the Taxon. Precursors to modern fish 55 million years ago

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Cephalochordata

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  1. Cephalochordata By Aleasha Connors, Molly Labenski, Savannah Turple, & Rose Walls

  2. Introduction • Lancelets or amphioxus • Buried in sand • Crucial in morphology and evolution • 26 species

  3. Evolution of the Taxon • Precursors to modern fish • 55 million years ago • Four distinguishing characteristics

  4. Four Distinguishing Characteristics • The Notochord • A Dorsal Hollow Nerve Chord • Gill slits in the Pharynx • Post Anal Tail

  5. Characteristics • ~5 cm long • Spawning at sunset • Closed circulatory system

  6. Life Cycle • Sperm & Egg • Gradual development from larvae • 2-5 year lifespan • Breeding season

  7. Fun Facts! • Food in China • Important part of food chain • High population density • Closest invertebrate relatives

  8. Sources • “Cephalochordata – Overview.”Encyclopedia of Life. N.p., n.d. Web. 01 Mar. 2013. <http:// eolpages/1575/overview>. • Infoplease. Infoplease, n.d. Web. 02 Mar. 2013. <http://www.infoplease/com/encyclopedia/ science/chordata-subphylum- cephalochordata.html>. • “Introduction to the Cephalochordata.”Introduction to the Cephalochordata. N.p., n.d. Web. 01 Mar. 013. <http://www.ucmp.berkely.edu/chordata/ cephalo.html>.

  9. Sources • “Result Filters.” National Center for Biotechnology Information. U.S. National Library of Medicine, n.d. Web. 01 Mar. 2013. <http:// www.ncbi.nlm.nih.gov/pubmed/15883887>. • “SUBPHYLUM CEPHALOCHORDATA.”Natural History Collections: Cephalochordata. N.p., n.d. Web. 26 Feb. 2013. <http:www.nhc.ed.ac.uk/index.php? page=24.25.312.327>.

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