The Species Black List
Hydrophis parviceps
Smith's small-headed sea snake
Smith's small-headed sea snake (Hydrophis parviceps) was long known only from two specimens collected within a small area of the southern Vietnamese coast in 1935 and 1960.
Status Data Deficient on the IUCN Red List Restriction tier 2, restricted, extent unclear Class Reptilia Realm Oceanic Locality The South China Sea As IUCN records it Hydrophis parviceps Smith, 1935 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