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Biology Ch. 6.3

Kingdom Animalia - Invertabrates

Animal Kingdom Includes the very small to the very large organisms on Earth. Animals are multicellular eukaryotes, heterotrophic, and reproduce sexually.
Incomplete Digestive Tract Only one opening (food & wastes use the same opening).
Complete Digestive Tract Separate openings for food & wastes.
Asymmetrical Body Irregular shape (i.e. sponges, who are the simplest animals).
Symmetrical Body Most animals are balanced in their shape.
Coelom A fluid-filled body cavity. The presence of a coelom allows for the development of more complex organ systems. Animals with a coelom = coelomates Animals without a coelom = acoelomates
Reproduction All animals reproduce sexually Some also reproduce asexually Some are hermaphrodites = have both male & female reproductive organs
Invertebrate Lack of internal structures Reproduction includes sexual & asexual Some are coelomate (i.e. earthworm) & some are acoelomate (i.e. flatworm)
8 Phyla of Invertebrates 1.Porifera 2.Cnidaria 3.Platyhelminthes 4.Nematoda 5.Annelida 6.Mollusca 7.Echinodermata 8.Arthropoda
Phylum Porifera Means “pore-bearing” Example: Sponges
Phylum Cnidaria ` Means “thistle” Examples: Jellyfish, corals, sea anemones, hydras
Phylum Platyhelminthes Means “flat, wide worms” Examples: Tapeworms, flukes, planarians
Phylum Nematoda Means “thread-like” Examples: Pinworms, hookworms
Phylum Annelida Means “ring” Examples: Earthworms, leeches, tubeworms
Phylum Mollusca Means “soft-bodied” Examples: clams, oysters, squids, octopi, snails, slugs, scallops
Phylum Echinodermata Means “spiny-skinned” Examples: starfish, sea cucumbers, sand dollars, sea urchins
Phylum Arthropoda The MOST successful phylum!! Over 1 million species have been identified. Very diverse – some live at the bottom of the ocean, and some float in the air.
Arthropods Have jointed appendages. Have bilateral symmetry. Have a coelom. Have a “tube within a tube” digestive system. Reproduce sexually.
Exoskeleton A rigid, jointed external skeleton. Is waterproof and protects against water loss. They must shed their exoskeleton in order to grow.
Insects They have many adaptations for feeding. Most are small in size, allowing them to hide. The nature of their body segments & attached appendages. Their well-developed nervous system. Their structures & functions related to feeding themselves.
Mimicry The ability to look like something else.
Created by: Inkina



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