Planalto Slaty-Antshrike
thamnophilus pelzelni
Thamnophilidae · Antbirds, Antwrens
- Disc 2 · 2001 listed
- Disc 3 · 2006 listed
- Disc 1 · 2011 listed
The account
Description
14 cm. This species and Thamnophilus ambiguus were recently split. Although very similar they are differentiable in the males by the color of the belly and in the females by the color of the mantle.
Male grayish above with a black crown. The forecrown is uniform grayish (more blackish streaked in ambiguus). The back is gray with some mixed black and gray plumage (more gray in ambiguus). Scapulars and wing-coverts black, boldly spotted white. Wings black, the primaries and secondaries edged white. Tail and rump feathers black with white tips. Below slate-gray with a whitish belly (grayish belly in ambiguus).
Females are reddish-brown above (olive-brown in ambiguus) with a rusty-brown crown (both forms). Wings and tail as in the male. Below pale olive-brown, more ochraceous in pelzelni. Voice : The songs of pelzelni and ambiguus are hard to distinguish. 15-17 rapid notes terminate in a trill or roll 'wak wak wak wak wak wak wakwak wakwakwakwkwkwkwkwkwk' rising somewhat in pitch. Isler et al suggest that it is possible to ascribe a song to either pelzelni or ambiguus by measuring the time of delivery of the first five notes. In pelzelni these are delivered in about 0.6 sec, in ambiguus in about 0.9 sec. However they report overlap in the characteristics of these songs suggesting that the best criterion for one or the other taxon is geographical distribution. Call a 'grrrr' (30) and a 'cow' (57). Behaviour : Forages low and concealed. Quivers its tail when calling. Breeding :
-
Male Disc 3 · 2006 -
Female. Disc 3 · 2006
Each plate is labelled with the disc's own caption.
Where it was recorded
The discs' own checklists select Planalto Slaty-Antshrike at 4 localities.
- Assis ASSB
- Itirapina ITSB
- Morro do Diabo MOSB outside the map
- Santa Barbara do Rio Pardo SNSB
How the map was made
The original program computed each red dot at display time from the locality's coordinates, using its map library and one of five base maps drawn for the screen widths of the day. That library's projection — an oblique rotation of the sphere about the map's own centre, 23.7°S 47.4°W — was read from the program and checked against the graticule the same program drew into the base maps: it reproduces every grid intersection to within about a pixel. The dots here use that projection on the 1280-pixel base map, with the coordinates the discs record. Nothing was placed by hand, no modern map data was used, and a place whose coordinate is incomplete, out of range or beyond the map's edge is listed rather than guessed.
The discs carried location maps only; none shows a distribution or range.
The account, continued
Habitat and status
In scrub and woodland borders, caatinga, secondary forests. Range : On the Brazilian Plateau in Estado de São Paulo (Bauru, Franca, Bebedouro, São Jeronimo [40]), Minas Gerais, and might be found inland closer to the coast in suitable habitat. Up to 1000 meters.
Taxonomy notes
On the basis of morphological differences the Thamnophilus punctatus complex was recently split into six allopatric species (57). These allopatric populations were considered to be full species even in the absence of discernible vocal differences, because the lack of clinal intermediary morphological characteristics of the populations at the contact zones suggested an absence of gene flow.
Decoded from the disc's own bytes. Each part is shown under the heading the disc files it under, and the wording, spelling and punctuation are the author's.
Vocalizations
-
Song, Pirapora, Minas Gerais, 11/12/98. Cloudy, 25°C. Gallery forest, scrub
-
Song, Pirapora, Minas Gerais, 11/13/98. Cloudy, 30°C. Scrub.
Recording files on the disc
- 3888.wav Song, Pirapora, Minas Gerais, 11/12/98. Cloudy, 25°C. Gallery forest, scrub
- 8173.wav Song, Pirapora, Minas Gerais, 11/13/98. Cloudy, 30°C. Scrub.
Across the three discs
The work was published on three discs — Disc 2 in 2001, Disc 3 in 2006 and Disc 1 in 2011. Where they differ, that is a difference between historical releases, and it is never merged away. The 2011 disc is not treated as correcting the earlier ones.
Which discs list this bird
- Disc 2 · 2001 — in this disc's bird list
- Disc 3 · 2006 — in this disc's bird list
- Disc 1 · 2011 — in this disc's bird list
How that was established
- Disc 2 · 2001
aux_nonzero;local_checklist_byte45_flag_1- Disc 3 · 2006
aux_nonzero;local_checklist_byte45_flag_1- Disc 1 · 2011
aux_nonzero;local_checklist_byte45_flag_1
The disc's own record fields that place the bird on its list: a non-empty entry in the species table, and the byte that marks it as selected on a local checklist.
The account in the Disc 1 · 2011 revision
In the 2011 Disc 1 revision, part of this account was truncated at exactly 512 bytes (a 2011 mastering defect). The earlier releases preserve the complete text.
Truncated sections in the 2011 revision: description. The complete earlier text is shown beneath each truncated section.
Description Disc 1 · 2011
14 cm. This species and Thamnophilus ambiguus were recently split. Although very similar they are differentiable in the males by the color of the belly and in the females by the color of the mantle.
Male grayish above with a black crown. The forecrown is uniform grayish (more blackish streaked in ambiguus). The back is gray with some mixed black and gray plumage (more gray in ambiguus). Scapulars and wing-coverts black, boldly spotted white. Wings black, the primaries and secondaries edged white. Tail a tc
Disc 1 (2011) text ends here — truncated at exactly 512 bytes in the 2011 mastering (historical defect, kept as recovered).
Complete earlier text — Disc 3 · 2006 (990 bytes lost in 2011)
14 cm. This species and Thamnophilus ambiguus were recently split. Although very similar they are differentiable in the males by the color of the belly and in the females by the color of the mantle.
Male grayish above with a black crown. The forecrown is uniform grayish (more blackish streaked in ambiguus). The back is gray with some mixed black and gray plumage (more gray in ambiguus). Scapulars and wing-coverts black, boldly spotted white. Wings black, the primaries and secondaries edged white. Tail and rump feathers black with white tips. Below slate-gray with a whitish belly (grayish belly in ambiguus).
Females are reddish-brown above (olive-brown in ambiguus) with a rusty-brown crown (both forms). Wings and tail as in the male. Below pale olive-brown, more ochraceous in pelzelni. Voice : The songs of pelzelni and ambiguus are hard to distinguish. 15-17 rapid notes terminate in a trill or roll 'wak wak wak wak wak wak wakwak wakwakwakwkwkwkwkwkwk' rising somewhat in pitch. Isler et al suggest that it is possible to ascribe a song to either pelzelni or ambiguus by measuring the time of delivery of the first five notes. In pelzelni these are delivered in about 0.6 sec, in ambiguus in about 0.9 sec. However they report overlap in the characteristics of these songs suggesting that the best criterion for one or the other taxon is geographical distribution. Call a 'grrrr' (30) and a 'cow' (57). Behaviour : Forages low and concealed. Quivers its tail when calling. Breeding :
Shown for comparison from the Disc 3 · 2006; it does not repair or replace the Disc 1 · 2011 historical text above.
Habitat and status Disc 1 · 2011
In scrub and woodland borders, caatinga, secondary forests. Range : On the Brazilian Plateau in Estado de São Paulo (Bauru, Franca, Bebedouro, São Jeronimo [40]), Minas Gerais, and might be found inland closer to the coast in suitable habitat. Up to 1000 meters.
Taxonomy notes Disc 1 · 2011
On the basis of morphological differences the Thamnophilus punctatus complex was recently split into six allopatric species (57). These allopatric populations were considered to be full species even in the absence of discernible vocal differences, because the lack of clinal intermediary morphological characteristics of the populations at the contact zones suggested an absence of gene flow.
The work's own taxonomy
The discs carried three parallel name schemes. All three are shown as recovered; none is a modern taxonomy and none has been updated.
| Scheme | Scientific name | English name | Family |
|---|---|---|---|
| WORLD | thamnophilus pelzelni | Planalto Slaty-Antshrike | Thamnophilidae |
| CLEMENTS | thamnophilus pelzelni | Planalto Slaty-Antshrike | Thamnophilidae |
| AOU_HM | thamnophilus pelzelni | Planalto Slaty-Antshrike | Thamnophilidae |
Open questions about this bird
Recovered evidence that has not been settled. It is published because leaving it out would misrepresent what the discs contain.
Review notes
review_0005
Recovered review record — open: Moved one terminal visual segment from account 115 to account 114.
Evidence: The segment contains image IDs 11343 and 662; both match image files and precede Sooretama's '14 CM' description. · Recommended: Confirm visually against the original program or field notes when available; retain correction unless contradicted.
Review v1.1 decision — accepted_provisionally
Reviewer: ChatGPT structural audit
Notes: The correction is strongly supported by account grammar, checklist order, species-name evidence, and media-segment placement. Retain in the working dataset; optional confirmation against the original program or field notes remains.
Source details
- Identifier on this site
- seb_species_0114
- Account identifier
- seb_account_0114
- Account number on the disc
- 114
- Source edition
- CD03 / 2006 package
- Original taxonomy scheme
- WORLD
- Species boundary note
- Boundary audited with account 115; one segment reassigned.
- Account boundary note
- Boundary audited with account 115; one segment reassigned.
- Structure status
- heuristic; decoded_account_text and segment JSON remain authoritative