Branchiostoma Floridae PRESENTED BY: RACHEL BELTZ Classification Common Name: Florida Lancelet Scientific Name: Branchiostoma floridae Kingdom: Animalia Phylum: Chordata Class: Leptocardii Sub Phylum: Cephalochordata Common Characteristics Evolutionary Advantage (common with phylum) Dorsal tubular nerve chord invertebrate nerve chord in ventral of alimentary canal in chordates a single chord is on dorsal side relative to alimentary canal anterior brain attached to it brain by cranium Symmetry: Bilateral Body Cavity: Acoelomate Free living organism filter feeder/ herbivore aquatic/ marine Segmentation: series of metameric blocks of muscles called myomeres dorsal nerve chord, notochord, post annul tail, pharyngeal fill slits rhythmic contracting of these muscles allows ability to swim like a fish Life Cycle/ Reproduction Average Life Span: 2-5 years (depends on species) Typical Offspring: Reproduces sexually Fertilization is external Eggs and sperm flow out of atrium and are released into water DIAGRAM OF LIFE CYCLE: EGG LARVAE Juvenile Stage Habitat/ Niche Habitat: sandy bottom in shallow seawater Temperate and tropical waters Off European shores and coasts of North America Niche: eats plant plankton and diatoms Pelagic Tunicate in action: Although this is not a video of a lancelet it is from the same phylum, Chordata and has a notochord like lancelets do. http://www.youtube.com/watch?v=Hj2F6WH7o7g&feature=related Special Characteristics White to creamy yellow, sometimes with pink tint Have fifty-six to sixty-four muscle blocks Length: approximitally 5-10 centimeters long Capture food particles with a mucus net Used for studies of embryonic development as well as food for humans and domesticated animals in Asia Not considered threatened or endangered Some have green fluorescent proteins protecting them in times of illness and stress WORKS CITED Web. 5 May 2011. <http://animals.jrank.org/pages/1665/LanceletsCephalochordata-FLORIDA-LANCELET-Branchi>. Web. 7 May 2011. <ostoma-floridae-SPECIES-ACCOUNT.html>. "The Shape of Life . Chordates | PBS." PBS: Public Broadcasting Service. Web. 7 May 2011. <http://www.pbs. org/kcet/shapeoflife/animals/chordates.html>. "Cephalochordata - Encyclopedia of Life." Encyclopedia of Life. Web. 7 May 2011. <http://www.eol.org/pages/1585>. "The Sea-squirts, Vertebrates and Their Allies (Phylum Chordata)." The Earth Life Web. Web. 7 May 2011. <http://www.earthlife. net/inverts/chordata.html>.