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Marine Worms

Marine Worms. Flatworms, Nematodes, Annelids,. General Characteristics of Marine Worms. bilateral symmetry Cephalization (Has a head ) Hydrostatic skeleton (no bones) most are benthic. Flatworms 2 types. No body cavity = flatbodies

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Marine Worms

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  1. Marine Worms Flatworms, Nematodes, Annelids,

  2. General Characteristics of Marine Worms • bilateral symmetry • Cephalization(Has a head) • Hydrostatic skeleton (no bones) • most are benthic

  3. Flatworms2 types • No body cavity=flatbodies • _No_ segments, No_ circulatory system, No Respiratory system • _Type 1_:Turbellarians (Non Parasitic) • _Type 2_: flukes and tapeworms (parasitic)

  4. Swimmers itch

  5. Flatworms • Most turbellarians are _carnivorous • __Chemoreceptors_: detect prey • unique prey-capturing mechanisms • _Stab__ • _Suffocate_ • pharynx secretes enzymes and pulls in food • food is digested in the gastrovascular cavity = which functions as a mouth and an anus__.

  6. Flatworms • Reproduction • _Asexually through regeneration • _Sexually_: Penis Fencing (flatworms are male and female. They fight with their penis’s the winner becomes the male, looser becomes the female)

  7. Nematodes • _round worms, tapered at both ends • _No segments___ • _They have a body cavity_: Hence why round in shape • __Most numerous animals on the planet__ • Handful of sediment may contain 3 million nematodes • http://www.youtube.com/watch?v=gofmShLJIPM&safety_mode=true&persist_safety_mode=1

  8. Nematods • Nonparasitic species are scavengers and are small in size__ • Parasitic and carnivorous species are larger_:

  9. Annelids • Bodies divided into _Segments_ • Has _a closed circulatory system__ • “more advanced” worm • Setae: used for locomotion and defense • Polychaetes (Not a bird)  are the main type of marine worm: For example, earthworm is an annelid, but it is not a polychaete ↑ common marine polychaetes ↓ deep sea vent tube worms

  10. ← errant polychaete featherduster→ Annelids • Polychaetes Annelids 2 Types: • _Type 1: Sedentary polychaetes that burrow or built tubes of sand, calcium carbonate, proteins. They filter feed_with cilia that extend from tubes and the aid of chemoreceptors.

  11. My Favorite Sedentary Polychaetes: _Christmas Tree Worms_; Also used in Avatar; IN Real Life Use their gills to capture plankton

  12. Polychaetes Annelids 2 Types: • Type 2: _Errant (swim)_polychaetes have jaws with teeth_ and nocturnally hunt small invertebrates. Many are poisonous and have a painful bite.

  13. Sexual Reproduction in Polychaetes • _Epitoky_ is a form of reproduction ,The worms undergo a transformation into an _Epitoke, a pelagic morph capable of _Sexual Reproduction. • Often an epitoke is the end part of the worm, which separates from the head. The end then releases the eggs or sperm. • .

  14. Other Marine Worms • _Peanut Worms_: Filter Feeder that burrows in the sand, sticking out its head to feed

  15. Other Marine Worms • _Spaghetti worms__: lies hidden in sediment or rocky crevices while its food-gathering tentacles wave overhead.

  16. Other Marine Worms • Fire worms have bristles that are filled with venom and easily break when touched to discourage predators. They also inflict a painful rash on any human who handles them

  17. Aliens or Marine Worms? New Species, of marine worms Yet still to be named……..

  18. Marine Worms • Name the three types/classifications of worms • List them from simple to complex • List three characteristics of each type of worm • Give two examples of sexual reproduction for worms • Describe two ecological roles of marine worms. • What is swimmers itch? • Define: Sedentary, Cephalization, Benthic, Errant, Polychaete and gastrovascular cavity • 7.

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