Micrurus

Pires, Matheus Godoy, Jr, Nelson Jorge Da Silva, Feitosa, Darlan Tavares, Prudente, Ana Lúcia Da Costa, Filho, Gentil Alves Pereira & Zaher, Hussam, 2014, A new species of triadal coral snake of the genus Micrurus Wagler, 1824 (Serpentes: Elapidae) from northeastern Brazil, Zootaxa 3811 (4), pp. 569-584 : 579

Key to species of the triadal group of Micrurus from northeastern Brazil

1a. Black snout; gular region with a black horseshoe shaped coloration over the infralabials and first genials; 23 to 39 subcaudal scales in males and 24 to 38 in females....................................................................2

1b. White snout with or without black markings; white gular region, sometimes with black markings on the genials; 17 to 33 subcaudal scales in males and 14 to 36 in females............................................................... 3

2a. Parietals entirely black; eyes wider than the half of their distance from the border of the mouth; head broader than neck; middle black rings shorter or of the same length as the external black rings.............................. Micrurus potyguara

2b. Posterior 1/3 to ½ of the parietals red; eyes smaller than half of their distance from the border of the mouth; head width indistinct from neck; middle black rings equal or longer than the external black rings................ M. lemniscatus carvalhoi

3a. White snout, preocular transversal white band; gular region with black markings on the genials; white rings equal or slightly shorter than the external black rings............................................................. M. ibiboboca

3b. White snout with varying degree of black on scales; white gular region; white rings longer than the external black rings.............................................................................................. M. brasiliensis