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Definition
| an invertebrate lacking a coelom |
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| a tendency in the evolution of organisms to concentrate the sensory and neural organs in an anterior head |
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| Opens externally toward posterior region of organism and can be extended through oral opening |
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| is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms |
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| is an invertebrate organ which occurs in pairs and function similar to kidneys |
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| A small simple eye, found in many invertebrates |
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| are a genus of atmospheric clouds generally characterized by thin, wispy strands |
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| is a class within the phylum Platyhelminthes that contains two groups of parasitic flatworms, commonly referred to as "flukes" |
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| is a common name of a lifecycle stage in two unrelated groups of species |
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| an anterior oral sucker surrounding the mouth |
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| For the early name for a computer "worm", see Computer worm |
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| Each segment in the strobila of a tapeworm, containing a complete sexually mature reproductive system |
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| is a phylum of invertebrate animals also known as "ribbon worms" or "proboscis worms" |
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| is an elongated appendage from the head of an animal, either a vertebrate or an invertebrate |
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| any of a group of invertebrates with a three-layered body that has a fluid-filled body cavity (pseudocoelom) between the endoderm and the mesoderm (the innermost and middle tissue layers) |
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Definition
| are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle |
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Definition
| is a biological tissue mass, most commonly a mass of nerve cell bodies |
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Definition
| is a linear series of body segments fundamentally similar in structure |
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| A ring- or donut-shaped area or structure |
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| are paired, lateral appendages extending from the body segements |
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| pertaining to the back or to any dorsum |
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| of or pertaining to the venter or belly; abdominal |
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| is a thickened glandular section of the body wall in earthworms and leeches, that secretes a viscid sac in which the eggs are deposited |
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| polychaetes are a class of annelid worms, generally marine |
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| a subclass of animals in the biological phylum Annelida, which is made up of many types of aquatic and terrestrial worms |
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| A class of worms, comprising the leeches that feed on |
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| is a network of intersecting nerves |
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| is one of the embryonic features unique to chordates |
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Definition
| the attachment organ of a tapeworm, generally considered the anterior, or cephalic, end |
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| a heavily ciliated feather-like tentacle found in highly organized clusters on the crowns of Canalipalpata |
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