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Marine Invertebrates - Coggle Diagram

- - - - Examples
        
        Phylum Arthopoda
        
        Phylum Mollusca
- - - - Phylum Nematoda
        
        Also know as roundworms. Typically marine nematodes are found in bottom sediments and at almost every water depth. Their movement is poorly developed.
        
        Phylum Platyhelminthes
        
        Also know as flatworm. They are acoelomates meaning they lack the internal cavity their body wall and digestive tract. They tend to be parasitic. They are covered in cilia which aids them in movement. They have an incomplete digestive tract, so one opening is used for food entering and waste leaving.
- - - - Components:
        
        Porifera stems from "pores" meaning there are holes and perforations within the bodies of sponges that filter water and collect nutrients
        
        Osculum: Excurrent pore where water exits
        
        Variants
        
        Spicules: some spongin are supported by hard and sharp spicules which are either calcareous and siliceous
        
        Spongin: some spongin are supported by internal networks of flexible spongin fiber
        
        Choanocytes: Flagellated current-producing cells which line the spongocoel
        
        Spongocoel: Internal cavity where food and oxygen are extracted
      - Structure I: multicellular organisms that lack tissues and organs such as muscles and nerves
      - Structure II: May appear radially symmetrical but usually conform to the surface shape to which they are attached or are shaped by the water currents around them
      - Location II: typically non-mobile creatures unless attached to other moving creatures
      - Location: typically exist in marine habitats and will attach to hard surfaces such as rocks;
- - - - Can be adhesive, paralyzing, or tangling
      - Nematocysts produced and housed in cnidocytes: a. characteristic of this phylum. :star:
      - Free-swimming Medusa
        
        Tentacled directed downward
        
        Example: jellyfish
        
        Attached, benthic Polyp
        
        Tentacled directed upward
        
        Example: anenomes