During a study of digenean parasites of deep-sea fishes, 81% (17 of 21) of Monomitopus agassizzi (Ophidiidae) from the Gulf of Mexico were infected with Megenteron manteri n. sp. and 10% (2 of 21) were infected with what appears to be a new species of Steringophorus. M. manteri n. sp. differs from M. crassum in having a longer body (3,733-9,394 microns), shorter caeca and a uterus that extends posteriorly beyond the ends of the caeca. The species of Steringophorus differs from other species in the genus in having smaller eggs (19-23 microns long) and caeca that extend into the posterior half of the hindbody.
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