Siphonops thomensis Bocage, 1873, J. Sci. Math. Phys. Nat., Lisboa, 4: 224. Syntypes: MBL (2 specimens); destroyed by fire in 1978; ZMB 8738 likely the only surviving syntype ( Bauer, Good, and Günther, 1993, Mitt. Zool. Mus. Berlin, 69: 287). Type locality: "l'Ile Saint Thomé" = São Tomé island.
Siphonops brevirostris Peters, 1874, Monatsber. Preuss. Akad. Wiss. Berlin, 1874: 617. Holotype: ZMB 4911, not ZMB 4711 as noted in the original publication; see discussion by Bauer, Good, and Günther, 1993, Mitt. Zool. Mus. Berlin, 69: 287). Type locality: "Westküste Afrikas (Guinea)"; restricted by Gorham, 1962, Das Tierreich, 78: 16, to "Rolas Island", São Tomé and Principe. Synonymy by Nussbaum and Pfrender, 1998, Misc. Publ. Mus. Zool. Univ. Michigan, 187: 1-32.
Dermophis brevirostris — Peters, 1880 "1879", Monatsber. Preuss. Akad. Wiss. Berlin, 1879: 937.
Dermophis thomensis — Peters, 1880 "1879", Monatsber. Preuss. Akad. Wiss. Berlin, 1879: 938.
Schistometopum thomense — Parker, 1941, Ann. Mag. Nat. Hist., Ser. 11, 7: 17.
Schistometopum ephele Taylor, 1965, Univ. Kansas Sci. Bull., 46: 295. Holotype: MSNG 8773, by original designation. Type locality: "Agua Ize (400-700 M.), Ilha São Thomé, Gulf of Guinea". Synonymy by Haft, 1992, Bonn. Zool. Beitr., 43: 478, and Nussbaum and Pfrender, 1998, Misc. Publ. Mus. Zool. Univ. Michigan, 187: 1-32.
Schistometopum brevirostris — Taylor, 1965, Univ. Kansas Sci. Bull., 46: 299.
Schistometopum brevirostre — Taylor, 1968, Caecilians of the World: 664.
Sao Tome Caecilian (Schistometopum thomense: Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 24).
São Thomé Caecilian (Ananjeva, Borkin, Darevsky, and Orlov, 1988, Dict. Amph. Rept. Five Languages: 15).
Aqua Ize Caecilian (Schistometopum ephele [no longer recognized]: Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 24).
Island Caecilian (Schistometopum brevisrostre]: Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 24).
São Tomé and Rolas islands, São Tomé and Principe, Gulf of Guinea.
Measey and Van Dongen, 2006, Evol. Ecol. Res., 8: 55-68, discussed aspects of geographic variation.
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