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The 2016 paper says"a well-supported South American clade with M. roboratus, M. watsonii, and M. atricapilla (Fig. 1), and an undescribed Megascops species from a population from the Santa Marta Mountains".
Molecular systematics of the new world screech-owls (Megascops: Aves, Strigidae): biogeographic and taxonomic implications.
SACC: This is a distinctive species, sister, surprisingly, to a clade containing M. roboratus, M. watsonii, and M. atricapilla (even though the new species seems closer to the M. guatemalae group in voice and morphology!).
 
The 2016 paper says"a well-supported South American clade with M. roboratus, M. watsonii, and M. atricapilla (Fig. 1), and an undescribed Megascops species from a population from the Santa Marta Mountains".
Molecular systematics of the new world screech-owls (Megascops: Aves, Strigidae): biogeographic and taxonomic implications.
SACC: This is a distinctive species, sister, surprisingly, to a clade containing M. roboratus, M. watsonii, and M. atricapilla (even though the new species seems closer to the M. guatemalae group in voice and morphology!).

So where will it sit in the list, after roberatus, before guatemalae?

Edit: I heard from Frank Gill who writes

'Tentatively pending resolution of relationships, at the end of Megascops, i.e. following White-throated Screech Owl'

A
 
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Thanks Andy, the position at the end of the list concurs with Cadena's comment on the SACC deal:"The vocal data carefully analyzed by Krabbe leave no doubt that this is a distinct species, and observation we confirmed with molecular data a few years ago revealing this population represents a long branch of somewhat uncertain affinities"
 
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