What characteristics of phylum Cnidaria are most important in distinguishing it from other phyla.doc

Each segment contains circulatory respiratory nervous

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each segment contains circulatory, respiratory, nervous and excretory structs as well as a coelom. pair of coelomic compartments in each segment. coelomic lining made up of peritoneum that lines the body wall of each compartment which forms dorsal and ventral mesentaries that cover all organs. the body walls surround the peritoneum and coelom contains circluar and long. muscles. Burrowing efficiency is increased by metamerism because a segmented body allows for peristaltic contractions to occur. Describe three ways that various polychaetes obtain food. clamworms- seize food with jaws wich proturde through the mouth with they evert their pharynx food is swallowed as worm width draws pharynx. movememnt of food happens through perstalsis. Tube worms: particle feeders use cilia or mucus to obtain food. Use radioles or feather tentacle arms to capture food in grooves and bring it down to the mouth. Pogonophorans: absorb nutrients dissolved in the water because they have no mouth or digestive tract Prostomium region of a segmented animal anterior to the mouth Peristomium
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Foremost true segment of an annelid; it bears the mouth Pygidium posterior closure of a segmented animal, bearing the anus Radioles featherlike processes from the head of many tubicolous polychaete worms used primarily for feeding Parapodium one of the paired lateral processes on each side of most segments in polychaete annelids Compare the circulatory system in each class of annelids In organisms of the phylum Annelida, the circulatory system is closed, meaning that blood circulation takes place only within specialized vessels. Describe the function of the clitellum and cocoon. Clitelum are specific to oligochaeta and hirudinida. it is a reproductive structure in the epidermis that appears the worms exterior as a fat band around the middle. produces the coocon in which eggs are depsoitied during sexual reproduction. What is a pogonophora? Where does it live? What does it eat? Beard worms. They live in mud on the ocean floor at depths of 100-10000m obtained only by dredging they livein long chitinous tubes in upright positions they have no mouth or digestive system, so they absorb some nutrients dissolved in seawater such as gllucose, amino acids, and fatthy acids. Most energy is derived from chemoautorophic bacteria that oxidize hydrogen disulfide to produce organic compounds from co2. the bacteria are helpd ina trophosome. Benthic marine worms with a tentacle introvert that develop by spiral cleavage with a molluscan cross are found in phylum ____________. Sipuncula Longitudinal muscles pertaining to or extending along the long axis of the body, or the direction from front to back, or head to tail. Circular muscles muscle layer encircling the body between the epidermis and longitudinal muscle layer Seminal receptacle pocket related to the semen of an earthworm Seminal vesicle small hollow organs that carry the semen of an earthworm polychaetes any marine annelid worm of the class Polychaeta, having a distinct head and paired fleshy appendages (parapodia) that bear bristles (chaetae or setae) and are used in swimming: includes the lugworms, ragworms, and sea mice
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