Proposal (531) to South American Classification Committee

 

Revise linear sequence of species in Pionus

 

Effect on SACC: All this does is make a slight change in linear sequence of species in Pionus.

 

Background:  Our current sequence is a traditional one for which I do not know if there is an explicit rationale.

 

New information:  Ribas et al.’s (2007) phylogeny based on ca. 2200 bp of mtDNA (cyt b, NAD2) produced a phylogeny with many well-supported nodes, at least among the traditionally defined species; they also includes many additional subspecies (which they treat as PSC species):

 

 

Their summary tree is best seen in this Figure:

 

 

Translating the tree into a linear sequence involves, obviously, the usual arbitrary conventions.  I suggest that the sequence start with the oldest lineage, fuscus, and which is sister to sordidus + maximiliani (sequence N to S).  Then, in the second group, tumultuosus is sister to menstruus + (senilis + chalcopterus) (sequence N to S).

 

Thus a sequence that reflects the phylogeny is:

 

fuscus
sordidus
maximiliani
tumultuosus

menstruus
senilis

chalcopterus

 

Literature Cited:

RIBAS, C. C., R. G. MOYLE, C. Y. MIYAKI, AND J. CRACRAFT. 2007. The assembly of montane biotas: linking Andean tectonics and climate oscillations to independent regimes of diversification in Pionus parrots. Proceedings Royal Society B 274: 2399-2408.

 

Van Remsen, June 2012

 

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Comments from Stiles: “YES. The change is relatively minor, and fits best with the phylogeny, which seems well supported.”

 

Comments from Pacheco: “YES.  The proposed sequence appears to correspond well to the results of Ribas and colleagues.”

 

Comments from Zimmer:  YES”.  The proposed sequence better fits the phylogeny of Ribas et al. (2007).

 

Comments from Nores: “YES, the sequence better fits the phylogeny of Ribas et al. (2007), which seems well supported.”