Archived 2016 topics: Collared Antshrike (Sakesphorus bernardi) is being transferred to the genus Thamnophilus and is being split: request for information for shumbae.

This is part of a consultation on the Red List implications of extensive changes to BirdLife’s taxonomy for passerines

Lynx Edicions and BirdLife International will soon publish the second volume of the HBW-BirdLife Illustrated Checklist of the Birds of the World, building off the Handbook of the Birds of the World series, and BirdLife’s annually updated taxonomic checklist.

The new Checklist will be based on the application of criteria for recognising species limits described by Tobias et al. (2010). Full details of the specific scores and the basis of these for each new taxonomic revision will be provided in the Checklist.

Following publication, an open and transparent mechanism will be established to allow people to comment on the taxonomic revisions or suggest new ones, and provide new information of relevance in order to inform regular updates. We are also actively seeking input via a discussion topic here regarding some potential taxonomic revisions that currently lack sufficient information.

The new Checklist will form the taxonomic basis of BirdLife’s assessments of the status of the world’s birds for the IUCN Red List. The taxonomic changes that will appear in volume 2 of the checklist (for passerines) will begin to be incorporated into the 2016 Red List update, with the remainder to be incorporated into subsequent Red List updates.

Preliminary Red List assessments have been carried out for the newly split or lumped taxa. We are now requesting comments and feedback on these preliminary assessments.

Collared Antshrike Sakesphorus bernardi is moving to genus Thamnophilus and is being split into Thamnophilus bernardi and T. shumbae, following the application of criteria set out by Tobias et al. (2010).

Prior to this taxonomic change, Collared Antshrike was listed as Least Concern under on the basis that it did not approach the threshold for Vulnerable under any criteria. Thamnophilus bernardi (as defined following the taxonomic change) is found in western Ecuador and Peru in the understory of woodland, riparian thickets, arid scrubland and mangroves (Zimmer and Isler 2016). The species has a large range, and has been described as common (Stotz et al. 1996). In the absence of any population declines, or significant threats to this species it is suspected that the population is stable, and as such this species is not suspected to approach the threshold for Vulnerable under any criteria. Hence, it is suggested that this species be listed as Least Concern.

T. shumbae is found in north-central Peru in the drainage basin of the Marañón River (Zimmer and Isler 2016), with an Extent of Occurrence of c.11,000 km2. Very little is known about this species regarding possible threats, population size and trends. We request any further information regarding this species, but in the absence of any additional information it is proposed that this species be listed as Data Deficient.



Stotz, D. F., Fitzpatrick, J. W., Parker, T. A., and Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.

Tobias, J. A., Seddon, N., Spottiswoode, C. N., Pilgrim, J. D., Fishpool, L. D. C. and Collar, N. J. 2010. Quantitative criteria for species delimitation. Ibis 152: 724–746.

Zimmer, K. and Isler, M.L. (2016). Collared Antshrike (Sakesphorus bernardi). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 9 September 2016).

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1 Response to Archived 2016 topics: Collared Antshrike (Sakesphorus bernardi) is being transferred to the genus Thamnophilus and is being split: request for information for shumbae.

  1. James Westrip (BirdLife) says:

    Based on available information, our preliminary proposal for the 2016 Red List would be to adopt the proposed classifications outlined in the initial forum discussion.

    There is now a period for further comments until the final deadline of 28 October, after which the recommended categorisations will be put forward to IUCN.

    Please note that we will then only post final recommended categorisations on forum discussions where these differ from those in the initial proposal.

    The final 2016 Red List categories will be published on the BirdLife and IUCN websites in early December, following further checking of information relevant to the assessments by both BirdLife and IUCN.

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