The Species Black List
Monognathus jesperseni
Jespersen's one-jawed eel
Jespersen's one-jawed eel (Monognathus jesperseni) is known only from a single specimen collected during the 1930s from deep waters off the coast of Sierra Leone.
Status Data Deficient on the IUCN Red List Restriction tier 5, type locality or a single collection Class Actinopterygii Realm Oceanic Locality The Tropical Atlantic Region As IUCN records it Monognathus jesperseni Bertin, 1936 This species is one of 3,062 in a list of vertebrates the IUCN Red List records as Data Deficient or has never assessed, ranked by how narrowly restricted the published record says they are. The sentence above is the evidence the tier was read from, quoted from Matthew Richardson, Threatened and Recently Extinct Vertebrates of the World (2023).
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Check this species elsewhere: IUCN Red List · GBIF