Proposal (305) to South American Classification Committee

 

Change linear sequence of species in Thamnophilus

 

Effect on SACC: This would rearrange the linear sequence of species in the genus to conform to recently published phylogenetic data.

 

Background & Analysis: With passage of Prop. 278, the current SACC sequence is:

 

doliatus

zarumae

multistriatus

tenuepunctatus

palliatus

nigriceps

praecox

nigrocinereus

cryptoleucus

aethiops

unicolor

schistaceus

murinus

aroyae

bernardi

atrinucha

punctatus

stictocephalus

sticturus

pelzelni

ambiguus

amazonicus

melanonotus

melanothorax

insignis

divisorius

caerulescens

torquatus

ruficapillus

 

This sequence no longer reflects the well-supported phylogenetic hypotheses of Brumfield and Edwards (2007), and perpetuates a number of misconceptions, e.g., (1) that torquatus and ruficapillus form a group with caerulescens rather than with the major group of striped Thamnophilus (doliatus group), and (2) that atrinucha is part of the punctatus group [which should also generate a proposal on the currently hyphenated English name of atrinucha].

 

A sequence that would reflect Brumfield & Edwards Fig. F (combined data set) and that uses the conventions of linear sequences (basal taxa first; NW to SE sequence in allopatric sister groupings; minimize changes to status quo sequence when possible) is as follows (with well-supported groups indicated in similar color and separated by spaces):

 

doliatus

ruficapillus

torquatus

zarumae

multistriatus

tenuepunctatus

palliatus

 

bernardi

atrinucha (extralimital bridgesi, sister to atrinucha, would go here in a complete list)

 

schistaceus

murinus

nigriceps

praecox

cryptoleucus

nigrocinereus

 

punctatus (no changes within this group because of missing taxa in genetic analysis)

stictocephalus

sticturus

pelzelni

ambiguus

 

caerulescens

unicolor

aethiops

aroyae

melanonotus

 

melanothorax

 

amazonicus

 

insignis

divisorius

 

Recommendation: With all the usual caveats about the arbitrariness of some aspects of linear sequences, the proposed new one certainly highlights phylogenetic relationships better than any previous sequence, so YES.

 

V. Remsen, August 2007

(in consultation with Robb Brumfield)

 

 

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Comments from Jaramillo: "YES - The new arrangement reflects newest data, and makes sense based on various aspects of plumage, distribution, ecology, voice etc."

 

Comments from Stiles: "YES. This proposal clearly reflects the substantial new phylogenetic data better than our preceding order."

 

Comments from Robbins: "YES. The proposal incorporates Brumfield and Edward's (2007) molecular data that significantly have improved our understanding of relationships within this genus."

 

Comments from Nores: "YES. El nuevo ordenamiento aparece mucho más lógico que el de SACC y está de acuerdo con un análisis molecular bien fundamentado. De todos modos, tiene las limitaciones de los análisis moleculares seĖalados en otras propuestas.

 

Comments from Zimmer: "YES. The proposed sequence is certainly more accurate with respect to the position of atrinucha, ruficapillus, and torquatus."