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Invertebrates can be grouped into eight taxonomic classes. Mollusks have a soft body covered by an outer layer, a mantle. Insects are largest group. They range in size from microscopic mites and almost invisible flies to giant squid with soccer-ball-size eyes. Chapter 7 Marine Animals Without a Backbone Chapter 8 Marine Fishes Chapter 9 Marine Reptiles, Birds, and Mammals Chapter 10 An Introduction to Marine Ecology Chapter 11 Between the Tides Chapter 12 Estuaries: Where Rivers Meet the Sea Chapter 13 Life on the Continental Shelf Chapter 14 Coral Reefs Chapter 15 Life Near the Surface Learn vocabulary, terms, and more with flashcards, games, and other study tools. Our survey of the many kinds of marine animals follows the traditional classification into two major groups: the vertebrates, which have a backbone (a row of bones called vertebrae), and the invertebrates, animals without a backbone. But seeing as over 90% of all animals get by just fine without backbones, it is not obvious why this novelty arose in the first place. Invertebrates are animals without a backbone. Marine invertebrates are ocean animals without backbones, including starfish, sponges, jellyfish, corals and anemones. 7, part 2: Marine Animals Without a Backbone. Biology of Molluscs Feeding and Digestion Molluscan gut has a seperate mouth and anus Involves salivary and digestive glands (enzymes) Grazers (snails) use a rasping radula (simple yet efficient) Digestion is partly extracellular in the gut and partly intracellular in the Without a Backbone favor by using their claws to drive away other animals that have a taste for coral tissue. https://en.wikipedia.org/wiki/List_of_marine_aquarium_invertebrate_species Many marine organisms are traditionally classified into two major groups: Vertebrates (animals WITH a backbone) Invertebrates (animals WITHOUT a backbone) At least 97% of all species of animals are invertebrates, many of which reside within the marine environment. Of the planet’s estimated 15-30 million animal species, 90% or more are invertebrates. Ch. Mollusks include slugs, snails, squid, octopuses and oysters. Invertebrates are animals without a backbone or bony skeleton. 7.6 Arthropods: The Armored Achievers. 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