TABLE 1 in Resolving a 182 - year-old taxonomic puzzle: Luciobarbus in the Persian Gulf basin (Teleostei: Cyprinidae)

TABLE 1. Key historical taxonomic viewpoints and synonymies of Luciobarbus species from the Persian Gulf and adjacent basins. Author (Year)Taxonomic ActionsNotesHeckel (1843)Described Barbus rajanorum (Qweiq), B. kersin (Qweiq), B. esocinus, B. schejch, B. xanthopterus (Tigris), B. pectoralis (Orontes), B. perniciosus (Orontes), and identified material as B. mystaceusBaseline descriptionsGünther (1868, 1874)Considered L. mystaceus and L. xanthopterus synonyms of L. schejch.Reverses Heckel’s multiple taxa to fewer synonyms, reducing complexity at that point in time.Sauvage (1884)Considered L. schejch and L. mystaceus synonyms of L. xanthopterus.Opposes Günther’s arrangement, creating a different lumping scenario.Berg (1949)L. mystaceus and L. schejch were included as synonyms of B. rajanorum.Shifts the confusion again by linking these species to B. rajanorum.Ladiges (1960)Followed Berg (1949), thus treating L. mystaceus and L. schejch as synonyms of B. rajanorum.Continues Berg’s (1949) perspective.Karaman (1971)Followed Berg (1949) and Ladiges (1960) in linking L. mystaceus and L. schejch to B. rajanorum. Also considered L. kersin and L. perniciosus synonyms of L. pectoralis, and L. barbulus, L. schejch as subspecies of other forms (e.g. L. rajanorum, L. capito).Complex taxonomic framework, without examining Heckel’s type material. Lumps multiple distinct entities under different names, mixing Euphrates/Tigris and Mediterranean taxa.Almaça (1991)Identified B. rajanorum as a hybrid (no longer a valid species).Challenges Berg (1949), Ladiges (1960), and Karaman (1971) by removing the status of B. rajanorum as a distinct species.Coad (1991)Building on Almaça’s (1991) conclusion, Coad (1991) also identified B. rajanorum as a hybrid, initially suggesting it resulted from a cross between L. pectoralis and C. damascina. Later clarification indicated that L. pectoralis does not occur in the Qweiq, which led to the corrected conclusion that B. rajanorum is a hybrid between L. schejch and C. damascina.Coad (1991) initially followed an incorrect parental combination, which was corrected once the absence of L. pectoralis in the Qweiq was established. This refinement built upon Almaça’s (1991) earlier recognition of B. rajanorum as a hybrid.Berg (1949), Ladiges (1960), and Karaman (1971) revisited by recent authorsL. mystaceus (from Tigris) is not conspecific with L. mursa (Caspian), and no valid reason remains to consider L. mystaceus (Heckel’s use) distinct from L. schejch. Likewise, L. barbulus is shown to be a junior synonym of L. schejch.Modern integrative approaches show that many historical lumping (e.g., into B. rajanorum) or splits were unfounded.Khaefi et al. (2017, 2018) & Jouladeh-Roudbar et al. (2020)Identified some fish as L. barbulus (= L. schejch) and others as L. kersin, sometimes proposing hybrids. Molecular evidence, however, places these in L. schejch.Contemporary studies still struggled with the legacy of historical confusion, mistaking hybrids and variants as distinct forms.Current Study (This Work)Recognises L. esocinus, L. schejch, and L. subquincunciatus as valid species. L. pectoralis is restricted to the Eastern Mediterranean, L. barbulus, L. kersin, and L. xanthopterus are synonyms or represent hybrids, and B. rajanorum is identified as a hybrid (L. schejch × C. damascina), and thus not a valid species.Integrative morphological and genomic evidence clarifies centuries of chaos.