BIO 2135 Quiz: Annelida Keywords
21 Oct 2015
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Aciculum: in polychaetes, a thick internal seta which supports either the notopodium or the neuropodium. Chitinous support rods within parapodia (organisms with paired, un-jointed lateral outgrowths from the bodies of two different invertebrate groups) found in the class polychaeta. The absence of the bundles of setae is a derived characteristic in leeches. Have serially homologous segments (metamerism) that repeat down the length of the animal. They are part of the protostome lineage. In some, it is a derived characteristic that the segmentation of the animla completely disappeared. Aortic arches: one of a series of paired arteries in a vertebrate embryo that connects the ventral arterial system to the dorsal arterial system. Blood flows in opposite directions through these arches. The segments in which the aortic arches are are the segments in which the reproductive organs are located. There are 5 aortic arches in earthworms. They pump the blood into the dorsal and.
