Bahrain
A fish, the Convict Zebra Sole Zebrias captivus (GBIF) (Google Books) (IUCN), is known only from two specimens collected off Bahrain.
Sea squirts known only from Bahrain include Aplidium rubripunctum (ResearchGate WM pdf).
A tortricid moth Bactra atopa (BHL) was described from Ain Adari in 1988.
A xanthid crab Palapedia apeli (GBIF) was described from Bahrain in 2015.
Marine molluscs described from Bahrain and apparently not collected since include Paradrillia lithoria (fig. 20 at BHL) (BHL) and Actaeon pulchrior (fig 26 at BHL) (BHL).