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| An animal that lacks a coelom. Acoelomates, which include the flatworm, fluke, tapeworm, and ribbon worm, exhibit bilateral symmetry and possess one internal space, the digestive cavity. |
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| is considered an evolutionary trend, whereby nervous tissue, over many generations, becomes concentrated toward one end of an organism. |
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| Opens externally toward posterior region of organism and can be extended through oral opening; connects internally |
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| specialized excretory cell found in the simplest freshwater invertebrates, including flatworms |
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| invertebrate organ which occurs in pairs and function similar to kidneys |
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| literally means "little eye" |
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| atmospheric clouds generally characterized by thin, wispy strands |
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| a class within the phylum Platyhelminthes that contains two groups of parasitic flatworms, commonly referred to as "flukes". |
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| a common name of a lifecycle stage in two unrelated groups of species: Apicomplexa parasites: see Apicomplexa lifecycle stages |
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| an anterior oral sucker surrounding the mouth, and a ventral sucker sometimes termed the acetabulum, on the ventral surface |
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| or tapeworms, differ in a number of ways from other flatworms. Their bodies are long and flat, made up of many segments |
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| Each segment in the strobila of a tapeworm, containing a complete sexually mature reproductive system. |
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| phylum of invertebrate animals also known as "ribbon worms" or "proboscis worms". Alternative names for the phylum have included Nemertini |
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| an elongated appendage from the head of an animal, either a vertebrate or an invertebrate. In invertebrates |
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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 |
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| bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle |
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| scalable distributed monitoring system for high-performance computing systems such as clusters and Grids |
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| matching of apparent color of objects with different spectral power distributions. Colors that match this way are called metamers |
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| A ring-shaped object, structure, or region. |
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| are paired, lateral appendages extending from the body segements. |
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| situated on or toward the upper side of the body, equivalent to the back |
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| situated on or toward the lower, abdominal plane of the body |
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| 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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| are a class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia |
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| subclass of animals in the biological phylum Annelida, which is made up of many types of aquatic and terrestrial worms |
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| Basic introduction to the orders and families, habitat, and value as an indicator of overall ecosystem health. |
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| a network of intersecting nerves. Except for the ventral rami of Th2-Th11 nerves, they combine sets of ventral rami of spinal nerves |
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| may refer to the following structures: in invertebrates, it refers to the ventral nerve cord, whereas; in chordates, it stands for the dorsal |
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| a large red tapeworm boss which can be found in the first level of The Womb |
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| a heavily ciliated feather-like tentacle found in highly organized clusters on the crowns of Canalipalpata |
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