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Phylum Annelida

Phylum Annelida. Jonas Reagan. Order Aciculata. This Order includes about half of all existing polychaete species that are worms who can move about freely by crawling, and/or swimming.

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Phylum Annelida

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  1. Phylum Annelida Jonas Reagan

  2. Order Aciculata This Order includes about half of all existing polychaete species that are worms who can move about freely by crawling, and/or swimming. Their distinguishing characteristics are that they have internal supporting chaetae, or chitinous bristles in their parapodia and structures to aid in locomotion.

  3. Odontosyllisluminosa • Bioluminescence is related to reproductive events and is used by females to attract a mate. • Spawn several days after full moon. • Release glowing egg masses thought to attract males • Only lasts 2-3 min.

  4. More Fun Facts • Females swim in circles and release more eggs and bioluminescent males swim in circles while glowingly releasing gametes. • Visible 30-50 m away • Differences in environmental factors like wind and surface currents have no effect on mating patterns. • Glowing is also a defense mechanism against predators who will suffer spasms and then paralysis after regurgitating the specimen. • Males are 12mm and Females are 20mm

  5. Super Fun Fact • Glowing of these worms were actually linked to the mysterious light Christopher Columbus described when he entered the Bahamas in November 1492.

  6. Order Canalipalpata This Order contains all the worms that stay in one place, living in a self-made tube composed of mud or sand cemented together with mucus. Their distinguishing characteristic are an elongated grooved palp structures used for feeding.

  7. Spirobranchusgiganteus This species literally translates to “spiral gills.” This relates to their highly derived respiratory structures. They are often times called “Christmas tree worms.” The feathery-like tentacles, radioles, trap prey that are digested immediately. They are sedentary filter feeders, so to reproduce, they simply release their gametes in the water where they are swept up by the currents. There are male and female organisms. Often found in attached to corals.

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