Proposal (512) to South American Classification Committee
Transfer genera from Emberizidae to Thraupidae
Proposal: If passed, this proposal would transfer
a number of genera from Emberizidae to Thraupidae.
Background: For a decade or more, we’ve known from
genetic data that many primarily South American genera placed traditionally in
the Emberizidae are actually tanagers.
Some we have already transferred.
This proposal seeks to move the remaining genera, as follows (with
supporting references in parentheses).
Porphyrospiza (1; also morphology – Tordoff 1954a)
Phrygilus (2, 3, 1, 4, 14)
Melanodera (4, 14)
Haplospiza (3, 1, 4, 14)
Idiopsar (4, 14)
Diuca (5, 1, 6, 4, 10)
Lophospingus (1, 6)
Poospiza (7, 2, 3, 1, 4, 11, 14)
Compsospiza (1, 7, 4)
Sicalis (5, 2, 3, 1, 10, 11, 14, 4)
Emberizoides (1, 4)
Embernagra (2, 3, 1, 4, 14)
Volatinia (2, 3, 1, 10, 11)
Sporophila (2, 3, 1; also morphology – Clark 1986, 11)
Oryzoborus (9 as related to/embedded within Sporophila,
10, 11, 14, 1, 2, 3)
Dolospingus (13)
Catamenia (2, 3, 1, 4, 11, 14)
Coryphospingus (2, 3, 1, 8, 12, 4)
Rhodospingus (8)
Gubernatrix (4)
Camarhynchus
(2, 3)
Certhidea (11, 2)
Coereba (11, 1, 2, 3, 5)
Euneornis (2, 3)
Geospiza (11, 12, 1, 2, 3)
Loxigilla (11, 14, 1, 2, 3)
Loxipasser (2, 3)
Melanospiza (2, 11, 3)
Melopyrrha (2, 3)
Pinaroloxias (11, 2)
Platyspiza (11, 2)
Tiaris (11, 12, 14, 1, 2, 3)
Parkerthraustes (1)
References (See SACC Bibliography for full citations):
(1) Klicka et al. 2007
(2) Burns et al. 2002
(3) Burns et al. 2003
(4) Campagna et al. 2011
(5) Bledsoe 1988
(6) Sedano & Burns
2009
(7) Lougheed et al. 2000
(8) Burns & Racicot
2009
(9) Lijtmaer et al. 2004
(10) Sibley & Ahlquist
1990
(11) Sato et al. 2001
(12) Yuri & Mindell
2002
(13) Robbins et al. 2005
(14) Mauck & Burns
2009
Part A. In our opinion, the
evidence is now overwhelming for their transfer from Emberizidae to
Thraupidae. A YES vote endorses
the transfer. If the proposal
passes, we’ll then work on a linear sequence.
Part B. There are also a
few genera for which there are as yet no unpublished data. Given their South American distribution
and their supposed relationships to the genera above, we recommend that they also
be removed from Emberizidae and placed Incertae Sedis until it can be confirmed
to which family they belong.
Donacospiza
Piezorhina
Xenospingus
Incaspiza
Charitospiza
Coryphaspiza
Van Remsen
& Kevin Burns, November 2011
=========================================================
Comments
from Stiles: “YES; the evidence is
clearly overwhelming, and my only fear is that the Thraupidae might displace
Trochilidae as the second-largest strictly New World family! Actually, this
makes the radiation of the Thraupidae (which presumably reached South America
relatively late in the game) one of the most explosive on record – a
diversity only exceeded by the Tyrannidae, which have been around considerably
(?) longer! Interesting
implications for the evolution of frugivory (and coevolution with the many
kinds of fruits taken and dispersed) in South America. And going back to a question raised by
Bob Storer a while back, how do we now define a “tanager”? A further query: what about Saltator?”
Comments from Pacheco: “A – YES. The evidence together is clearly satisfactory. B –
YES. I also agree. At least, one
reinforcing point: the nest of Charitospiza,
only recently described, shown to be similar to that of Coryphospingus. See:http://www.ararajuba.org.br/sbo/ararajuba/artigos/Volume161/ara161not1.pdf”
Comments from Pérez: “A- YES.
There is a large amount of published information that needs to be incorporated
into our classification. B- YES, hoping more information will provide with
relevant phylogenetic information to place these birds within the oscine
radiation. I am also intrigued by the absence of Saltator in the list,
but I think it will have to go into the Incertae Sedis category.”
Comments from Jaramillo: “YES – For various reasons, and datasets
summarized in the proposal.
“Part B – I am not a
fan of Incertae Sedis, I must admit. I actually think we should bite the
bullet, and assess that there are various reasons to move most if not all of
these to Thraupidae now. I think these have not been treated in the molecular
works, but morphology, voice in some cases, and other aspects of their natural
history allies most if not all of these with the group we are moving to
Thraupidae. I would rather go ahead and do that now, and fix any errors that
may be found in this arrangement at a later date rather than have them hang
about as Incertae Sedis for years. At least Donacospiza
is similar enough to Poospiza
visually and vocally to some extent, that I would have little hesitation in
moving that one over. Similarly, Coryphaspiza
is almost surely in with Embernagra
and Emberizoides. I think that Piezorhina, Xenospingus and Incaspiza
are a group, and perhaps they are allied with one of the branches formerly in Phrygilus but admit that these are not
as clear to me? Charitospiza I know
nearly nothing about, and that is the only one that seems like a real oddball
to me, although the potential link there to Coryphospingus
mentioned makes some sense.”
Comments from Robbins: “A – YES, published data indicate that these
should be moved to Thraupidae. B.
YES - given presumed relationships to other taxa being moved to this family, I
support transferring these taxa to Thraupidae.”
Comments from Zimmer: “YES” with respect to the mass transfer of the
named genera from Emberizidae to Thraupidae, on the basis of the overwhelming
body of evidence cited in the proposal.
As Gary points out, this has all kinds of implications concerning the
radiation of the Thraupidae and the evolution of frugivory. It also raises the question of whether
we can continue to sustain our retention of long established English group
names for these birds in light of the fact that we now have so many birds with names
that are downright misleading. The
occasional English name anomaly is tolerable (e.g. meadowlarks are not larks,
nighthawks are not hawks, etc.), but we are now approaching a situation where
there are as many Thraupidae with an English name suggesting some kind of finch
as there are with the English name of “tanager”. Conversely, we now have all kinds of birds that are not
tanagers whose English names are directly contradictory. It nearly kills me to even contemplate
a change from the familiar Western, Scarlet, Summer and Hepatic tanagers to
Western, Scarlet, Summer and Hepatic finches, but, at some point, I have to
wonder if we aren’t really mucking things up in the name of stability. Nowhere is it written that names have
to be descriptive; they should just be unique. However, a big reason for wanting names to be unique is to
aid in communication and convey information when discussing the species
involved. By having so many
“finches” named tanagers, and having so many “tanagers” named finches, I fear
that we are not only not facilitating communication, but, are instead, having
the opposite effect. It’s hard
enough explaining to birders and non-birders that a kittiwake is still a gull,
and that an araçari is still a toucan, but when you have to explain why there
are bunches of finches that are tanagers, and bunches of tanagers that are
finches, and why most saltators are called saltators but some are called
grosbeaks, while other grosbeaks aren’t grosbeaks at all, the whole purpose of
having group names starts falling apart.
We already addressed this with Turdus,
by calling everything a “thrush” (with one exception) and not a “robin”. Should we not consider some similar
major changes in light of our better understanding of relationships within these
groups? Would a switch to
“Grass-Tanager” as a group name for Emberizoides,
or incorporation of the genus name “Piranga” as a group name to replace
“tanager” for Piranga be that bitter
of a pill to swallow? I’m all for
stability with regard to English names, but there comes a point when sticking
with the status quo is actually destabilizing to the entire process. I would also suggest that some of the
groups that we have moved wouldn’t require a name change. Having a group of birds called
“seedeaters” or “grassquits” nested within Thraupidae is not inherently
contradictive. I would liken these
cases to the “araçari-toucan” example raised earlier. But I do think we should consider getting our English group
names as much in alignment with our phylogeny as we can. As
regards Part B of this proposal, I would go along with Alvaro’s suggestion
that we be bold and place the 6 genera proposed for Incertae Sedis into
Thraupidae on the basis of what we can infer from morphological, vocal and
behavioral similarity to genera that we have already transferred to
Thraupidae. Further analysis may
reveal that one or more of these have to be moved again, but I think that is a
reasonable risk to take. I’m not
quite as certain as Alvaro that Coryphaspiza
belongs with Embernagra and Emberizoides, at least not when you
consider how divergent it is vocally, but that’s a discussion for another time.”
Additional comment from
Remsen on “tanager”: With regard to Kevin’s comment on
changing the English names of non-tanager “tanagers”, in my view the name
tanager no longer has any phylogenetic meaning but rather an ecomorph
connotation, just as in “grosbeak”, “finch”, “sparrow,” “warbler,”
“flycatcher,” “bunting,” etc., namely a bill morphology intermediate between
specialized seed-crushing and specialized insectivory. The problem is that the English name of
the Thraupidae is “Tanagers”, and maybe that’s what has to change? “True Tanagers”?”