Bathycongrus longicavis is an eel in the family Congridae (conger/garden eels).Bathycongrus longicavis at www.fishbase.org. It was described by Emma Stanislavovna Karmovskaya in 2009.Karmovskaya, E. S., 2009 [ref. 30139] New records of congrid eels of the genus Bathycongrus (Congridae) in the west-central tropical Pacific Ocean, with a description of three new species. Journal of Ichthyology v. 49 (no. 2): 139–153. It is a tropical, marine eel which is known from the Pacific Ocean, including Vanuatu and the New Hebrides Trench. It dwells at a depth range of 532–599 metres. Males can reach a maximum total length of 38.6 centimetres.
The species epithet refers to the long cavity on the abdomen of the species.
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