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Thraupidae (1 Viewer)

I will be looking forward to comments from the group holding that talk at the upcoming conference mentioned in the proposal. On one hand the words about selection against hybrids could be understood to allow recognition of two species. On the other hand, gene flow through the hybrid zone could argue the other way.
Niels
 
I have a question about Dacnis egregia aequatorialis von Berlepsch & Taczanowski, 1884 OD here

Berlepsch used the name already in 1873 here . Of course he only suggested western Ecuador as distribution area and no description. Is the missing description the reason why not Dacnis egregia aequatorialis von Berlepsch, 1873? How will this be exactly treated according the code?
 
Taphrospilus said:
Berlepsch used the name already in 1873 here . Of course he only suggested western Ecuador as distribution area and no description. Is the missing description the reason why not Dacnis egregia aequatorialis von Berlepsch, 1873? How will this be exactly treated according the code?
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Nomen nudum in 1873, made available in 1884.

Article 12. Names published before 1931
12.1. Requirements
To be available, every new name published before 1931 must satisfy the provisions of Article 11 and must be accompanied by a description or a definition of the taxon that it denotes, or by an indication.
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12.3. Exclusions
The mention of any of the following does not in itself constitute a description, definition, or indication: a vernacular name, locality, geological horizon, host, label, or specimen.
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But, as it is clear in the 1884 work that the name was coined in 1873 by Berlepsch alone, and Berlepsch was one of the authors there as well, it could arguably be Dacnis egregia aequatorialis Berlepsch 1884.
 
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Diego Cueva, Gustavo A. Bravo, and Luís Fábio Silveira (2022) Systematics of Thraupis (Aves, Passeriformes) reveals an extensive hybrid zone between T. episcopus (Blue-gray Tanager) and T. sayaca (Sayaca Tanager). PLoS One 17: e0270892.
Published: October 5, 2022
Systematics of Thraupis (Aves, Passeriformes) reveals an extensive hybrid zone between T. episcopus (Blue-gray Tanager) and T. sayaca (Sayaca Tanager)

Abstract
The Neotropical avian genus Thraupis (Passeriformes, Thraupidae) currently comprises seven species that are widespread and abundant throughout their ranges. However, no phylogenetic hypothesis with comprehensive intraspecific sampling is available for the group and, therefore, currently accepted species limits remain untested. We obtained sequence data for two mitochondrial (ND2, cyt-b) and three non-coding nuclear (TGFB2, MUSK, and βF5) markers from 118 vouchered museum specimens. We conducted population structure and coalescent-based species-tree analyses using a molecular clock calibration. We integrated these results with morphometric and coloration analyses of 1,003 museum specimens to assess species limits within Thraupis. Our results confirm that Thraupis is a monophyletic group and support its origin in the late Miocene and subsequent diversification during the Pleistocene. However, we found conflicts with previous phylogenies. We recovered Thraupis glaucocolpa to be sister to all other species in the genus, and T. cyanoptera to the remaining five species. Our phylogenetic trees and population structure analyses uncovered phylogeographic structure within Thraupis episcopus that is congruent with geographic patterns of phenotypic variation and distributions of some named taxa. The first genetic and phenotypic cluster in T. episcopus occurs east of the Andes and is diagnosed by the white patch on the lesser and median wing coverts, whereas the second group has a blue patch on the wing and distributes to the west of Colombia’s eastern Andes. Finally, we present evidence of hybridization and ongoing gene flow between several taxa at different taxonomic levels and discuss its taxonomic implications.
 

Widespread convergent morphological evolution within the largest family of songbirds​

Amelia-Juliette Demery, Kevin J Burns
Evolution, qpac069, pendingpublications


Abstract
Although convergence is a common evolutionary phenomenon, few studies have quantified its prevalence across a large, densely sampled clade. Large-scale phylogenies and the advent of novel computational methods facilitate more robust identification of convergent events and their statistical significance. The tanagers (Aves: Thraupidae), the largest family of songbirds, offer an excellent opportunity to study the extent of phenotypic convergence in response to similar ecological pressures on a continental scale. To investigate convergence in the group, we used the largest phylogenetic and multivariate morphological dataset to date for the clade. First, we used phylogenetic comparative analyses to show a correlation between diet and aspects of bill shape. We then investigated our dataset for the presence and magnitude of convergent events and assessed significance through simulations and modeling analyses. Overall, we found that around half (45.3%) of species and clades we tested have converged in morphological space more than would be expected by chance alone. Our study shows that across Thraupidae, various bill shapes have evolved convergently to fill multiple distinct sections of ecological niche space, reflecting a signal of ecological opportunity and structural constraints.
 
Markus Lagerqvist said:

Widespread convergent morphological evolution within the largest family of songbirds​

Amelia-Juliette Demery, Kevin J Burns
Evolution, qpac069, pendingpublications


Abstract
Although convergence is a common evolutionary phenomenon, few studies have quantified its prevalence across a large, densely sampled clade. Large-scale phylogenies and the advent of novel computational methods facilitate more robust identification of convergent events and their statistical significance. The tanagers (Aves: Thraupidae), the largest family of songbirds, offer an excellent opportunity to study the extent of phenotypic convergence in response to similar ecological pressures on a continental scale. To investigate convergence in the group, we used the largest phylogenetic and multivariate morphological dataset to date for the clade. First, we used phylogenetic comparative analyses to show a correlation between diet and aspects of bill shape. We then investigated our dataset for the presence and magnitude of convergent events and assessed significance through simulations and modeling analyses. Overall, we found that around half (45.3%) of species and clades we tested have converged in morphological space more than would be expected by chance alone. Our study shows that across Thraupidae, various bill shapes have evolved convergently to fill multiple distinct sections of ecological niche space, reflecting a signal of ecological opportunity and structural constraints.
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Is there a link to the abstract?
 
Corydospiza 1872



Methodi naturalis avium disponendarum tentamen. Försök till fogelklassens naturenliga uppställnung CJ Sundeval

BHL says: Stockholm, Samson & Wallin, 1872[-73]

Details - Methodi naturalis avium disponendarum tentamen. Försök till fogelklassens naturenliga uppställnung - Biodiversity Heritage Library .

OD:

Methodi naturalis avium disponendarum tentamen - Biodiversity Heritage Library .

Richmond says Aug? 1872.

http://www.zoonomen.net/cit/RI/Genera/C/c01680a.jpg .



Porphyrospiza 1873

OD: Nomenclator avium neotropicalium - Biodiversity Heritage Library .

First mentioned: Nomenclator avium neotropicalium - Biodiversity Heritage Library .

1873 on title page and intro by authors dated December 1873.

Nomenclator avium neotropicalium - Biodiversity Heritage Library


Not sure about all the SACC but noticed by Gary Stiles in Proposal 730.
"the genus would have to be Porphyrospiza by priority." Not right?
 
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mb1848 said:
Corydospiza 1872



Methodi naturalis avium disponendarum tentamen. Försök till fogelklassens naturenliga uppställnung CJ Sundeval

BHL says: Stockholm, Samson & Wallin, 1872[-73]

Details - Methodi naturalis avium disponendarum tentamen. Försök till fogelklassens naturenliga uppställnung - Biodiversity Heritage Library .

OD:

Methodi naturalis avium disponendarum tentamen - Biodiversity Heritage Library .

Richmond says Aug? 1872.

http://www.zoonomen.net/cit/RI/Genera/C/c01680a.jpg .



Porphyrospiza 1873

OD: Nomenclator avium neotropicalium - Biodiversity Heritage Library .

First mentioned: Nomenclator avium neotropicalium - Biodiversity Heritage Library .

1873 on title page and intro by authors dated December 1873.

Nomenclator avium neotropicalium - Biodiversity Heritage Library .
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Thank you for confirming. Why do the sources use Porphyrospiza instead of Corydospiza for the 3 species?
 
I am perplexed, I would like to place the following species: Acanthidops bairdii, Geospizopsis plebejus, G. unicolor, Spodiornis rustica and Haplospiza unicolor in a single genus, Haplospiza due to the relatively young clade and their homogeneous morphology. However, Haplospiza unicolor Cabanis 1851 would become a homonym of Haplospiza (Geospizopsis/ ex Phrygilus) unicolor (d'Orbigny & Lafresnaye, 1837). There is apparently no name to replace Haplospiza unicolor Cabanis, 1851, but I only looked in two sources (Checklist of birds and Catalogue birds of America). Do you know if a specific name exists to replace "unicolor" of Haplospiza unicolor Cabanis, 1851 ?
 
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mb1848 said:
Spiza unicolor Lichtenstein 1854
Nomenclator avium Musei zoologici berolinensis - Biodiversity Heritage Library .
Cabanis 1851 OD : T.1 (1850-1851) - Museum Heineanum - Biodiversity Heritage Library .
Phrygilus unicolor Burmeister 1857 but Burmeister conflates H. unicolor and G. unicolor?
T.3 (1856) - Systematische Uebersicht der Thiere Brasiliens - Biodiversity Heritage Library .
SACC proposal says Phrygilus unicolor is sister of Haplospiza;?
Revise Phrygilus classification .
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Geospizopsis plebejus and Geospizopsis unicolor were previously placed in Phrygilus but they are now in Geospizopsis near to Haplospiza unicolor, Acanthidops bairdii and Spodiornis rusticus. I want to put all of these species in a single, Haplospiza, but if I do that, there will be two 'Haplospiza unicolor' and obviously there can't be two 'Haplospiza unicolor'. Is there a valid name that can be used to replace Haplospiza unicolor Cabanis, 1851 to avoid homonymy ?
 
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Jim LeNomenclatoriste said:
My bad.

In their revision, Burns & al. (2016) suggest in their alternative classification to put Acanthidops, Geospizopsis and Spodiornis in Haplospiza but but do not describe an alternative name for Haplospiza unicolor Cabanis, 1851.
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Is the name that needs an alternative Geospizopsis unicolor, as it would be going into the older genus? In which case there are lots to choose from.
 
Mike Earp said:
Is the name that needs an alternative Geospizopsis unicolor, as it would be going into the older genus? In which case there are lots to choose from.
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Not Geospizopsis unicolor (Plumbeous Sierra-Finch), which has priority, but Haplospiza unicolor (Uniform Finch) needs an alternative name.
 
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A new genus or species name? AOU used Haplaspiza rustica but DelHoyo and Birds of the World use Spodiornis rusticus. But if you put unicolor out of Haplaspiza might as well get a new genus name.
 
mb1848 said:
A new genus or species name? AOU used Haplaspiza rustica but DelHoyo and Birds of the World use Spodiornis rusticus. But if you put unicolor out of Haplaspiza might as well get a new genus name.
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New species name

In short :

Haplospiza bairdi (Ridgway, 1882)
Haplospiza plebejus (Tschudi, 1844)
Haplospiza rustica (Tschudi, 1844)
Haplospiza unicolor (d'Orbigny & Lafresnaye, 1837)
Haplospiza 'unicolor' Cabanis, 1851 (new name to replace unicolor)
 

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