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Chaetognatha

Chaetognatha. By: Brian Jones, Owen Klassen, Sean Stoqua. Introduction. Phylum Chaetognatha are often called ‘arrow worms’ Live in marine ecosystems Most are planktonic (80%) while some are benthic (20%) Most abundant type of animal present in many deep sea environments

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Chaetognatha

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  1. Chaetognatha By: Brian Jones, Owen Klassen, Sean Stoqua

  2. Introduction Phylum Chaetognatha are often called ‘arrow worms’ Live in marine ecosystems Most are planktonic (80%) while some are benthic (20%) Most abundant type of animal present in many deep sea environments 120 modern species that range in size from 2 to 120 mm One of the earliest Bilaterians

  3. Evolution While early fossils have been found .. Their fossils do not preserve well … Have been around since the Cambrian time period It has been hypothesized that they are linked to the deuterstome phyla or acanthocephalan worms

  4. Characteristics Transparent or translucent torpedo shaped invertebrate Body is made up of three sections There is a fin on the tail as well as two sets of lateral fins They have a circulatory system, gaseous exchange organs or excretory system Hermaphroditic Gets its name from ‘grasping spines’ around its mouth

  5. Interesting Facts Some have bioluminescent organs in their fins Some feed on freshly hatched fish and other arrow worms Contain neurotoxins used to paralyze and kill their prey They were around during the same time period of the dinosaurs Today they can be found in every ocean in the world

  6. More Facts • They are all carnivores • Although they have been around for 300 million years, they are still abundant in numbers • Considered a useful model for examining ancestral bilateran • Their nervous system is relatively simple and resembles that of a protosome • Also known as “glassworms”

  7. Video • https://www.youtube.com/watch?v=PkGhxtpK7IU • The first 40 seconds of this video demonstrates the movements of the cool grasping spines of the chaetognatha

  8. Sources • http://academic.evergreen.edu/t/thuesene/chaetognaths/chaetognaths.htm • http://www.helium.com/items/1291972-what-are-arrow-worms • http://eol.org/pages/1740/overview • http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Chaetognatha.html • http://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/21862/1/23%282%29_P95-183.pdf

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