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'''Saccopharyngiformes''' is an [[order (biology)|order]] of unusual [[ray-finned fish]], superficially similar to [[eel]]s, but with multiple internal differences. Most of the fish in this order are deep-sea types known from only a handful of specimens, such as the [[pelican eel]]. Some species are [[bioluminescent]]. Some, such as the
Saccopharyngiforms lack several bones, such as the [[symplectic bone]], the bones of the [[operculum (fish)|opercle]], and ribs. They also have no [[scale (zoology)|scale]]s, [[pelvic fin]]s or [[swim bladder]]. The jaws are quite large, lined with small teeth, and several types are notable for being able to consume fish larger than themselves. Their [[myomere]]s (muscle segments) are V-shaped instead of W-shaped as in all other fishes, and their lateral lines have no pores, instead being modified to groups of elevated tubules.
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