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| The outer cell or germ layer of an organism; came from ectoderm |
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| The middle cell or germ layer of an organism |
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| The innermost layer of an organism; came from endoderm |
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| Phylum of worms known as the flatworms that |
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| A system in which a fluid provides the support for an organism |
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| Body cavity lacks lining of true coelomates |
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| "Mini-brain" that is the main component of nervous systems for worms |
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| Structures found in Platyhelminthes, which serve as mini-kidneys for the excretory system |
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| An organism that obtains its nutrients by living in or on another organism (ex. Flukes and Tapeworms) |
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| Class of free-living flatworms, which have a simple life cycle and are most often decomposers and scavengers in aquatic environments (Ex. Planarian) |
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| Class of flatworms that consist primarily of flukes, known for their complex two-step life cycle (mollusk-vertebrate (human) |
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| Class of flatworms that consists primarily of tapeworms, and is known for unique structures (scolex and proglottids) |
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| Phylum of worms known as roundworms. They are known for their tiny cylindrical body, pseudocoelomate, living in virtually every environment |
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| Phylum of worms known as segmented worms. These worms have segments both internally and externally and also have a closed circulatory system. (Ex. Earthworm) |
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| Bulb shaped head of Class Cestoda (tapeworms), which has a combination of suckers and hooks |
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| One segment of a tapeworm's ribbon-like body that contains both male and female structures; mature segments are at the anterior end of the worm |
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| Free-living flatworm that lives in freshwater and serves as a great representation for the Class Turbellaria |
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| An organism that has both male and female reproductive organs (Platyhelminthes and Annelids) |
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| Thin membrane that separates each segment in Annelids |
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| Swollen region in the anterior of an earthworm |
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| Small bristles on segmented worms that aid in movement and sensation |
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| Short hairs that aid in movement for many flatworms |
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| Portion of the digestive tract that temporarily stores food; found in the annelids |
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| A thick-walled digestive organ that grinds food; found in annelids |
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| Closed circulatory system |
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| System of vessels containing blood that absorbs and circulates nutrients through the organism |
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| tube-like structure in each body segment except the first three and the last, which are used to excrete metabolic and nitrogen wastes in earthworms |
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| Openings on the epidermis of earthworms through which metabolic wastes are excreted |
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| a mass of nervous tissue that serves as a brain in earthworms and other annelids |
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| Noncellular covering that serves as protection for many parasitic invertebrates |
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| Host cell that serves as a source of nutrients for immature parasites (roundworms) |
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| Sac-like structures in earthworms that store sperm from its own testes until mating occurs (segments 9, 11 and 13) |
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| Sac-like structures in earthworms that store sperm received from its mating partner (segments 9 and 10) |
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| blood vessel found on the dorsal side in annelids that carries blood to the heart |
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| blood vessel found on the ventral side in annelids that carries blood away from the heart |
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| muscles found in nematodes and annelids, which run the length of the worms body and aid in movement |
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| blood vessel loops in annelids that regulate the blood flow in the organisms (segments 7-11) |
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| Opening at the anterior end of the earthworm where solid wastes are removed |
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| Fleshy lobe (lip) covering the mouth at the cephalic end of the worm |
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| Sacks that receive and store eggs from the ovary to be released during mating |
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