However, in terebellids, the filaments arise from the mouth or are restricted to the anterior three segments, whereas cirratulid branchiae occur throughout the body, one pair per segment.
12.
The heart has a direction from right to left . The rectum and uterus are attached to each other along the branchiae, and terminate in an ear-shaped gutter, produced by the margin of the mantle.
13.
The dorsal fin originates immediately behind the branchiae and continues to the caudal extremity, resembling a modern ammocoete or lamprey larva rather than an adult, in which separate anterior and posterior dorsal fins are to be found.
14.
This crown, which can be extended for feeding and gas exchange, and rapidly retracted when threatened, consists of two bundles ( one right and one left ) of featherlike gills, known as " branchiae " or " radioles ".
15.
Instead he suggested that they might be brachiopod lophophores, which are feeding organs that contain a lot of extracellular material, or polychaete branchiae, which are respiratory organs composed largely of non-cellular cuticle both of these types of structure have been found in the Burgess Shale, in which all the known specimens of " Odontogriphus " have been discovered.
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