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Invertebrate Index

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Classification of invertebrates note 

This index is for insects, arachnids, worms, sponges and every other type of creature without a backbone. See The Other Wiki for more information on this category of animal.

Arachnid tropes go under Arachnid Tropes, insect tropes go under Insect Index, and mollusk tropes go under Mollusk Tropes (with cephalopod tropes going under Cephalopod Index).


  • Antlion Monster: A monster that hunts by waiting for its prey at the bottom of a pit.
  • Artistic License – Arachnids: Inaccurate and badly researched portrayals of arachnids.
  • Artistic License – Marine Biology: Inaccurate and badly researched portrayals of crustaceans, mollusks, echinoderms, cnidarians, and other marine invertebrates.
  • Atrocious Arthropods: Arthropods are depicted as evil or dangerous.
  • Big Creepy-Crawlies: Arthropods of unnaturally large size.
  • Bug Catching: Catching arthropods for fun and profit.
  • Bugs Herald Evil: The presence of arthropods as a signal that something worse is coming.
  • Bug War: A war against insect-like creatures from outer space.
  • Bug Works: An index of works about insects and other invertebrates such as arachnids (e.g. spiders), myriapods (e.g. centipedes), gastropods (e.g. snails), etc.
  • Cartoon Bug-Sprayer: A type of bug-sprayer with a push-handle and a cylindrical tank mounted crosswise to its nozzle.
  • Creepy Centipedes: Centipedes portrayed as frightening and unnerving monsters.
  • Electric Jellyfish: Jellyfish that shock people with electricity instead of being venomous.
  • Four-Legged Insect: An arthropod portrayed with fewer legs than it should have.
  • Friend to Bugs: A character who genuinely loves creepy-crawlies.
  • Giant Enemy Crab: Outsized, dangerous crabs.
  • Hive Caste System: Arthropods or arthropod-like creatures living in a rigidly ordered caste system with ranks based on innate biology.
  • Instant Leech: Just Fall in Water!: Fall in suspicious water, emerge covered in leeches.
  • Literal Bookworm: Either actual worms or wormy bugs that eat books, read books, or read books by eating them.
  • Penny-Pinching Crab: Crabs portrayed as stingy, greedy and money-obsessed.
  • Pitiful Worms: Insulting a person by comparing them to worms or other puny little critters.
  • Red Live Lobster: Uncooked lobsters and other crustaceans, especially in animation, depicted as red-colored.
  • Sand Worm: Enormous, wormlike beasts that tunnel unseen underground to attack prey walking above.
  • Sea Hurtchin: Sea urchins’ spines hurt.
  • Somewhere, an Entomologist Is Crying: Inaccurate and badly researched portrayals of insects.
  • Super-Powered Shrimp: A creature based on a shrimp, typically one of the more eccentric species enhanced in some way according to the media it appears in.
  • Worm in an Apple: Worms are strongly associated with apples, usually as a sight gag.
  • The Worm That Walks: Creatures that are actually masses of smaller things, usually invertebrates, moving as a single entity.