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In page Hagfish:

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Hagfish are typically about 50 cm (19.7 in) in length. The largest-known species is Eptatretus goliath, with a specimen recorded at 127 cm (4 ft 2 in), while Myxine kuoi and Myxine pequenoi seem to reach no more than 18 cm (7.1 in). Some have been seen as small as 4 cm (1.6 in).[citation needed]