Proposal
(13) to South American
Classification Committee
Continue to recognize Strix
chacoensis as distinct from S. rufipes
Finally, I propose that we follow Straneck
& Vidoz (1995), Hardy et al. (1999), and König et al. (1999) in treating Ciccaba
chacoensis as a distinct species from C. rufipes. Plumage and
vocalizations strongly support the split (see above refs; listen to Hardy et
al.). Given that chacoensis may be more closely allied with C.
hylophila, chacoensis should be placed between those two taxa in our
linear arrangement.
Mark B. Robbins,
December 2001
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Comments from Jaramillo: "YES. Having seen and heard chacoensis
in Salta, Argentina as well as rufipes in Chile I have no doubt that
they are separate species. There are similarities in plumage, in particular
pale female rufipes may look like chacoensis but that is about
the entirety of the similarity between these two taxa. Most male rufipes,
and certainly all southern rufipes are much darker and coarsely marked
than any chacoensis. The differences in voice are very striking, as are
the differences in habitat between the two species. The chaco thorn forests
where chacoensis is found are quite dissimilar from the southern beech (Nothofagus)
forests that one finds rufipes in. In the northern part of the range rufipes
is found in much shorter, arid woodlands but in these cases it is found in the
moistest, tallest, protected valleys."