Not valid. Described from the Pacific sailfish, Histiophorous brevirostris (= Istiophorus platycephalus), Indian Ocean. Kirtisinghe’s specimen resembles P. filosa in overall shape and size, which has been found previously on Pacific sailfish (Causey 1960). The rationale to differentiate P. biloba from other Pennella found on large billfish is brief and unconvincing. Not reported since the original record. Status of species inquirendae (Hogans 1988a). Synonym of P. filosa.