Term
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Definition
| The muscles that cause the valves to close. Adductor muscles add to a midline. |
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Definition
| low pressure heart that pump "blood" to the ctenidia in squid |
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Definition
| gland involved in ionic regulation, ridding the body of excess calcium and controlling pH in bodily fluids. Found on the esophagus of earthworms. |
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Definition
| major center of glycogen and fat synthesis and storage in earthworms. Appears as a conspicuous girdle around the intestine in the anterior half of the worm. |
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Definition
| A conspicuous swelling towards the anterior end of the earthworm. this structure secretes mucus that helps to adhere mating worms. Furthermore, the mucus allows sperm motility during transfer (from the testes of one individual, which will be stored in the spermatheca of the other individual) |
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Definition
| a body cavity that arises from embryonic mesoderm. a true coelom is lined by a tissue called the peritoneum. |
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Definition
| epithelium in which the cells elongate and fit together like the pickets in a picket fence |
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Definition
| specialized cells found only in the epithelium of cnidarians; produce organelles called nematocysts |
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Definition
| a large thin walled sac that stores food |
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Definition
| a nonliving layer on the outer surface of an organism, tending to retard water loss |
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Definition
| having separate sexes, i.e. some individuals contain the male reproductive and others the female |
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Definition
| the innermost of the 3 embryonic tissue layers first delineated during gastrulation |
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Definition
| the outermost of the 3 embryonic tissue layers |
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Definition
| an aggregation of neuron cell bodies |
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Term
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Definition
| inner layer of body wall (endoderm) in cnidarians; includes cells specialized for enzyme secretion which are used in digestion. |
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Definition
| internal cavity of cnidarians; lined w/gastrodermis and used for digestion and nutrient distribution (is NOT a coelom) |
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Definition
| a highly muscularized sac that contracts and grinds food due to the presence of small stones in the food |
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Term
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Definition
| having both M and F reproductive systems in the same individual |
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Term
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Definition
| in bivalves the elastic hinge is responsible for opening the shell |
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Definition
| tube connecting gizzard to anus. most digestion occurs here although digestive enzymes are also secreted in the pharynx, crop and gizzard |
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Definition
| tissue that secretes the shell in molluscs |
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Definition
| a jellyfish, or the free swimming stage in the cnidarian life cycle |
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Term
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Definition
| the tissue of the 3 embryonic tissue layers first delineated during gastrulation, gives rise to many of the organ systems |
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Definition
| the jelly-like, gelatinous filling between the ectoderm and endoderm of cnidarians |
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Term
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Definition
| in earthworms, refers to the serial segmentation of the coelom by transverse septa |
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Term
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Definition
| stinging structures everted by specialized organelles; produced by cnidocytes in cnidarians |
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Term
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Definition
| an excretory tubule that usu. opens to the exterior. A metanephridium, such as that in Lumbricus (common earthworm) opens into the coelom by a ciliated funnel (nephrostome) |
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Term
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Definition
| the part of the gut between the mouth and the esophagus. It is quite muscular |
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Term
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Definition
| the sessile stage in the life cycle of cnidarians |
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Term
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Definition
| organisms that have a protostomal development where the first opening formed during development is the mouth |
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Definition
| the feeding organ of some molluscs, a protrusible portion of the anterior mouth which is covered with chitinous teeth, used for rasping food off of rocks |
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Definition
| part of the male reproductive system that functions in storing sperm |
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Term
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Definition
| composed of 2 layers of peritoneum (one from the segment in front, and one from the segment behind), which forms transverse partitions between segments in earthworms |
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Definition
| hair-like projections (4/segment) that help to anchor the earthworm within the soil |
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Definition
| an extension of the mantle, present in squid and several other cephalopods. oriented to help control directionality of movement |
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Definition
| a body segment, present in series, i.e. metameric segmentation |
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Definition
| a specialized structure that stores sperms received from another worm during mating. Fertilization occurs internally at a later time when the sperm are released and used to fertilize eggs |
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Definition
| a longitudinal fold projecting into the intestine in certain invertebrates such as the earthworm |
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Term
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Definition
| the oldest part of a bivalve shell, located adjacent to the hinge |
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