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Biodiversity Exam 4 (questions and answers)2022

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Biodiversity Exam 4 (questions and answers)2022 Phylum Annelida vermiform homonomous metamerism w/ metameres setae parapodia closed circulatory system metanephridia most expansive coelom ... Vermiform form of worm 00:21 01:14 Metamerism w/ metameres segmentation metameres = segments that contain similar organs Homonomous metamerism segments that look the same Heteronomous metamerism segments that look different Setae = chaetae hair like sticky projections used for movement made of chitin Parapodia like feet on sides of organism what setae attach too Annelida circulatory system closed 5 hearts blood w/ hemoglobin (stores & traps oxygen) Metanephridia kidney one in each segment of annelida Annelida movement crawling & swimming move in circular & longitudinal fashion longitudinal is shortening contract sphincter muscle which makes them narrow shortening + getting narrow allows movement same land and water movement Trochophore larva both annelids & mollusks have trochophore larva which indicates that they may be closely related link to annelids & mollusks found in all mollusks and some annelids (polychaeta & marine) Annelida classes 1. class polychaeta 2. class oligochaeta 3. class hirudinea Class Polychaeta Phylum Annelida many setae well developed head pharynx that can be extended outwards w/ jaws of chitin parapodia ex. sandworm, tubeworm, palalo worm, & fireworm Tubeworm christmas tree worm build tubes to live in can close off tubes w/ operculum class polychaeta Palalo worm segments filled w/ eggs look like tapeworms people in 3rd world countries eat them reproductive orgies come together during spawning periods (mass spawning over several nights) tubeworm class polychaeta Fireworms have setae that sting [Show More]

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