The Species Black List
Gastrotheca williamsoni
Williamson's marsupial frog
Williamson's marsupial frog (Gastrotheca williamsoni) is known only from its original collection in 1922 from northern coastal Venezuela (Carabobo state).
Status Data Deficient on the IUCN Red List Restriction tier 5, type locality or a single collection Class Amphibia Realm Neotropical Locality Terra firma As IUCN records it Gastrotheca williamsoni Gaige, 1922 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