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Furnariidae (1 Viewer)

LeNomenclatoriste said:
I really need to learn to read a figure because I don't understand how they can to determine that this branch is a species and this one is a subspecies when they are of equal distance. They treat juruanus as a separate species but not costaricensis which seems older. I need more explanation
Click to expand...

From a quick read I understand they propose to split D. certhia into 7 species (including the juruanus taxon). The main reason is if I read well that D. hoffmansi only differs 1.95% mtDNA from D. picumnus, while the 7 taxa within D. certhia differ an average 2.4%.

Obviously, an alternative treatment that is I believe equally defendable would be to lump hoffmansi with D. picumnus (hence also avoiding paraphyly in that group), a lump which has been suggested in the past by others as well.
 
LeNomenclatoriste said:
It must obligatorily be above 2% ? ^^'
Click to expand...

No, their reasoning is that if hoffmannsi, which is considered a species, has only 1.94% divergence, then taxa with more than that should also be considered species. They don't necessarily consider 2% a threshold value.

Personally I think also many geneticists are gradually becoming aware that defining species rank purely on mtDNA divergence is not robust.
And in the absence of any clear morphological or vocal differences it becomes really tricky I would say...

Fortunately, in the recent mega-split of the Rufous Antpitta complex genetics and vocals nicely go hand in hand.
 
So, the best solution is to treat hoffmannsi as subspecies if vocal differences are weak. Unless we raise transfasciatus at species level.

Species taxonomy in my checklist is based on HBW but I think I will reduce the number of Dendrocolaptes species to 4
 
Stopiglia, R., Bockmann, F. A., de Assis, C. P., Raposo, M. A. (2020). Alpha taxonomy of Synallaxis stictothorax group (Aves: Passeriformes: Furnariidae): Synallaxis chinchipensis Chapman, 1925 as a valid species, with a lectotype designation. Vertebrate Zoology, 70(3): 319-331.

Abstract.
The Synallaxis stictothorax group comprises poorly understood South American Furnariidae. This paper aims to present the morphological and nomenclatural aspects of this group, re-describing its valid species and to propose a fresh nomenclatural treatment for group members. Our analysis corroborated the specific status of the disputed taxon Synallaxis chinchipensis and refuted the diagnostic characteristics of the subspecies Synallaxis stictothorax maculata. Following the recommendations of the Code, a lectotype was designated to the nominal species Synallaxis hypochondriaca. We also draw attention to the need for continued review of the taxonomy of polytypic species, as this is the most efficient way of distinguishing natural groups from those that are merely historical artefacts of bird taxonomy.

https://www.senckenberg.de/de/wisse...hriften/vertebrate-zoology/archiv/vz-70-3-05/
 
Synallaxis stictothorax

LeNomenclatoriste said:
Stopiglia, R., Bockmann, F. A., de Assis, C. P., Raposo, M. A. (2020). Alpha taxonomy of Synallaxis stictothorax group (Aves: Passeriformes: Furnariidae): Synallaxis chinchipensis Chapman, 1925 as a valid species, with a lectotype designation. Vertebrate Zoology, 70(3): 319-331.

Abstract.
The Synallaxis stictothorax group comprises poorly understood South American Furnariidae. This paper aims to present the morphological and nomenclatural aspects of this group, re-describing its valid species and to propose a fresh nomenclatural treatment for group members. Our analysis corroborated the specific status of the disputed taxon Synallaxis chinchipensis and refuted the diagnostic characteristics of the subspecies Synallaxis stictothorax maculata. Following the recommendations of the Code, a lectotype was designated to the nominal species Synallaxis hypochondriaca. We also draw attention to the need for continued review of the taxonomy of polytypic species, as this is the most efficient way of distinguishing natural groups from those that are merely historical artefacts of bird taxonomy.

https://www.senckenberg.de/de/wisse...hriften/vertebrate-zoology/archiv/vz-70-3-05/
Click to expand...

Proposal (882) to SACC

Split Synallaxis stictothorax into two species: coastal S. stictothorax and interior S. chinchipensis
 
Phacellodomus rufifrons

Eamon C. Corbett, Gustavo A. Bravo, Fabio Schunck, Luciano N. Naka, Luís F. Silveira, and Scott V. Edwards. Evidence for the Pleistocene Arc Hypothesis from genome‐wide SNPs in a Neotropical dry forest specialist, the Rufous‐fronted Thornbird (Furnariidae: Phacellodomus rufifrons). Molecular Ecology
https://doi.org/10.1111/mec.15640
First published: 24 September 2020

Abstract:

South American dry forests have a complex and poorly understood biogeographic history. Based on the fragmented distribution of many Neotropical dry forest species, it has been suggested that this biome was more widely distributed and contiguous under drier climate conditions in the Pleistocene. To test this scenario, known as the Pleistocene Arc Hypothesis, we studied the phylogeography of the Rufous‐fronted Thornbird (Phacellodomus rufifrons), a widespread dry forest bird with a disjunct distribution closely matching that of the biome itself. We sequenced mtDNA and used ddRADseq to sample 7,167 genome‐wide single‐nucleotide polymorphisms from 74 P. rufifrons individuals across its range. We found low genetic differentiation over two prominent geographic breaks — particularly across a 1,000 km gap between populations in Bolivia and Northern Peru. Using demographic analyses of the joint site frequency spectrum, we found evidence of recent divergence without subsequent gene flow across those breaks. By contrast, parapatric morphologically distinct populations in northeastern Brazil show high genetic divergence with evidence of recent gene flow These results, in combination with our paleoclimate species distribution modeling, support the idea that currently disjunct patches of dry forest were more connected in the recent past, likely during the Middle and Late Pleistocene. This fits the major predictions of the Pleistocene Arc Hypothesis and illustrates the importance of comprehensive genomic and geographic sampling for examining biogeographic and evolutionary questions in complex ecosystems like Neotropical dry forests.
 
Jim LeNomenclatoriste said:
Stopiglia, R., Bockmann, F. A., de Assis, C. P., Raposo, M. A. (2020). Alpha taxonomy of Synallaxis stictothorax group (Aves: Passeriformes: Furnariidae): Synallaxis chinchipensis Chapman, 1925 as a valid species, with a lectotype designation. Vertebrate Zoology, 70(3): 319-331.

Abstract.
The Synallaxis stictothorax group comprises poorly understood South American Furnariidae. This paper aims to present the morphological and nomenclatural aspects of this group, re-describing its valid species and to propose a fresh nomenclatural treatment for group members. Our analysis corroborated the specific status of the disputed taxon Synallaxis chinchipensis and refuted the diagnostic characteristics of the subspecies Synallaxis stictothorax maculata. Following the recommendations of the Code, a lectotype was designated to the nominal species Synallaxis hypochondriaca. We also draw attention to the need for continued review of the taxonomy of polytypic species, as this is the most efficient way of distinguishing natural groups from those that are merely historical artefacts of bird taxonomy.

https://www.senckenberg.de/de/wisse...hriften/vertebrate-zoology/archiv/vz-70-3-05/
Click to expand...
Synallaxis chinchipensis

IOC Updates Diary Dec 31

Accept proposed split of Chinchipe Spinetail from Necklaced Spinetail.
 
DDonsker said:
Wording to Diary entry of Dec 15 revised:

Dec 15 Accept lump of Layard's Woodcreeper with Rondonia Woodcreeper with English name change of combined species to Dusky-capped Spinetail.
Click to expand...
So merge 2 Woodcreepers and you get a Spinetail . . . that's nicely counter-intuitive! I can see there'll be lots of confused birders :rolleyes:
 

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