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Biology Ch. 6.3
Kingdom Animalia - Invertabrates
| Term | Definition |
|---|---|
| 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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