Proposal (139) to South American Classification Committee
Recognize Coeligena eos as separate
species from Coeligena bonapartei
Coeligena bonapartei was described by Boissoneau (1840)
from Bogotá, presumably based upon specimens sent to Paris by Goudot (or from
some of the earliest "Bogotá" skins): since it does occur commonly
around Bogotá this seems reasonable as a type locality. C. eos was
described by Gould (1848) from "the highlands of Venezuela and
Colombia", later restricted to Mérida, Venezuela by Wetmore & Phelps
(1952). They differ in plumage characters, males of eos having
the secondaries and tail mostly rufous and a more golden-bronze coloration
overall. They were considered separate species by Cory (1918) and Peters
(1945).
However, Wetmore and Phelps (1952) described the race consita from
three females collected in the Serranía de Perijá on the Colombia-Venezuela
border and based upon its intermediate characters, considered that all three of
these forms were best considered races of a single species. This was followed
by Meyer de Schauensee (1966) and Sibley & Monroe (1990).
However, Schuchmann (1999) split eos as a
separate species from bonapartei (with consita), and this was
followed by Hilty (2002). Schuchmann's rationale was "plumage
characters" but no specific comparisons were presented. Thus, the validity
of the split rests entirely on whether the differences in plumage between eos
and consita-bonapartei are of a magnitude to justify it -- and by
implication, whether consita is sufficiently closer to bonapartei to
discard its intermediacy as a reason for lumping them.
In their description of consita, Wetmore & Phelps
(1952) considered this form closer to eos than bonapartei because
of its conspicuous rufous spot on the secondaries, which they noted was
slightly smaller than in the former. In ventral pattern, they noted its less
spotted throat and more extensively green breast and sides, its tail and
upperparts greener (the tail entirely golden-green rather than "mostly
hazel"), relative to eos. Compared to bonapartei,
consita was described as more bronzy above, the throat and crissum paler,
the abdomen less greenish. They also noted that in some bonapartei females,
there was a smaller, fainter spot of "brown" (dull rufous) on the
concealed parts of the secondaries. They had no males of consita.
Schuchmann´s (1999) text confirms that those features present in
females of consita and interpreted as representing
intermediacy also occur in males: the rufous area of the secondaries is smaller
than in eos, the overall color is greener than in eos but
more golden-bronze than in bonapartei. The three appear similar in
size, as noted by Wetmore and Phelps (1952), although Schuchmann (1999) stated
that the bill of eos was "shorter than in other Coeligena".
However, judging from measurements presented by Wetmore & Phelps (1952) for
their series of consita, its bill is also slightly shorter on
average than those of a large series of measurements I have made on female bonapartei.
I have also confirmed the statement by Wetmore and Phelps to the effect that a
small dull rufous area is present on the secondaries of an appreciable
proportion of bonapartei of both sexes. There is a considerable gap
between the known ranges of consita and bonapartei in Colombia,
but as noted by Wetmore & Phelps, the intervening area has been poorly
collected (and much of it is dangerous).
Based on the published data of Wetmore & Phelps and Schuchmann
and my own experience with bonapartei, I believe that Wetmore &
Phelps were correct in considering all three forms conspecific. Indeed, if one
were to separate them it is practically arbitrary whether to consider consita
a race of eos or bonapartei, depending upon which characters one
chooses to emphasize. Moreover, the amount of intraspecific variation in
several other undoubted species of Coeligena (iris, torquata, violifer)
equals or exceeds that within a broad bonapartei. I therefore
recommend a NO vote on this proposal.
(I note here that I have not touched the question of whether to
include orina as a race of bonapartei or as a separate species.
FYI, the evidence from recently collected specimens clearly shows that orina
is a separate species; a publication on this is in progress, and I shall
present a proposal in due course).
Literature Cited:
Boissoneau 1840, Revue Zool. 1840:6
Gould 1848, PZSL 1848:11
Cory 1918, Catalogue of Birds of the Americas, vpl. 2 pt. 1.
Peters 1945, Checklist of Birds of the World, vol. 5
Wetmore & Phelps Jr. 1952, Proc. Biol. Soc. Washington 65:135
Meyer de Schauensee 1966, Species of Birds of South America
Sibley & Monroe 1990, Distribution and Taxonomy of Birds of the World
Schuchmann 1999, Handbook of Birds of the World, vol. 5
Hilty 2002, Guide to the Birds of Venezuela
Gary Stiles, November 2004
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Comments from Remsen: "NO. There is no published
rationale that trumps Wetmore & Phelps assessment."
Comments from Pacheco: "[NO. O arranjo arbitrariamente proposto por Schuchmann não
pode ser aceito diante das informações disponíveis."
Comments from Jaramillo: "NO. More data are needed to assess if this split
is reasonable."
Comments from Nores: "NO. Las razones son similares a lo de los casos anteriores. No hay
elementos de peso para pasar las subespecies a especies."
Comments from Zimmer: "NO. Subspecies consita sounds
to be perfectly intermediate, both morphologically and in its geographic
distribution."