White-bearded Antshrike

biatas nigropectus

Thamnophilidae · Antbirds, Antwrens

Disc 2 · 2001 listed
Disc 3 · 2006 listed
Disc 1 · 2011 listed

The account

Description

19 cm. Male has a black crown, throat and breast and shows a distinct pointed crest when perch-gleaning which is not depicted nor mentioned in the literature. White collar starting from under the bill extends to the back of the neck. Back chestnut olive. Wings and tail reddish-brown. Belly olive-brown.

Female has rufous-brown crown and white superciliary stripe. Collar is buff-whitish. Back olive-brown. Wings and tail chestnut-brown. Belly buff-olivaceous.

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 White-bearded Antshrike at 5 localities.

Historical checklist localities on the disc's own area map — the red dots the original program drew, placed by its recovered projection. Not a range map: it shows the places whose checklists record the bird, nothing more. 1 has no usable coordinate and is listed below unplotted.

Fazenda Intervales FASB
Jureia-Peruibe JUSB position not recoverable
Serra dos Orgãos SRRB
Serra dos Tucanos SDTC
Ubatuba UBSB

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.

Voice

Song is a series of soft and unhurried 'piu piu piu piu piu....' notes reminiscent of a trogon. These notes are sometimes intermingled with a faster 'pi..pi..pi..pi..pi..' repeated every 10 seconds or so. Can also be heard on ¹¹³.

Behavior

Found in the lower, middle and high stratum of humid forest and bamboo thickets. Very difficult to see when singing. Can be observed when foraging in bamboo. In November a male observed foraging alone in the canopy of open forest interspersed with patches of bamboo at Fazenda Intervales caught a large Tettigoniid grasshopper and carried it away.

Habitat and status

Uncommon in humid forest with a preponderance of bamboo stands. This species currently qualifies as 'vulnerable'. Destruction of habitat, especially bamboo forest, certainly contributes to the rarity of this species (¹⁰³).

Distribution

Mostly throughout. Serra dos Orgãos (¹⁵), Serra Mantiqueira, Fazenda Intervales, Jureia. To 1600 meters on Itatiaia.

Taxonomy notes

A secretive ant shrike of Southeast Brazil, associated with bamboo thickets (Guadua) with a typical song. For more information see ¹⁷²

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. Fazenda Intervales, 11/29/97. Sunny, 27°C. Secondary forest. With Drymophila rubricollis, Turdus rufiventris, Carpornis cucullatus, Todirostrum plumbeiceps, Leptotila verreauxi, Cyclarhis gujanensis.
Faint song. 10/22/99, Serra da Mantiqueira, Tres Picos Trail. Clear, 25°C. Primary forest.
Song. Fazenda Intervales 10/25/00. Sunny, 25°C. Primary forest. With Lipaugus lanioides, Platycichla flavipes, Ramphotrigon megacephala, Chiroxiphia caudata, Mackenziaena severa.
Song, Fazenda Intervales, 11/6/95, sunny, 25°C, low forest with bamboo. With Carpornis cucullatus, Vireo olivaceus.

Recording files on the disc

11155.mp3 Song. Fazenda Intervales, 11/29/97. Sunny, 27°C. Secondary forest. With Drymophila rubricollis, Turdus rufiventris, Carpornis cucullatus, Todirostrum plumbeiceps, Leptotila verreauxi, Cyclarhis gujanensis.
9363.wav Faint song. 10/22/99, Serra da Mantiqueira, Tres Picos Trail. Clear, 25°C. Primary forest.
7488.wav Song. Fazenda Intervales 10/25/00. Sunny, 25°C. Primary forest. With Lipaugus lanioides, Platycichla flavipes, Ramphotrigon megacephala, Chiroxiphia caudata, Mackenziaena severa.
11758.mp3 Song, Fazenda Intervales, 11/6/95, sunny, 25°C, low forest with bamboo. With Carpornis cucullatus, Vireo olivaceus.

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

The 2011 Disc 1 revision carries this account text unchanged from the Disc 3 release.

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	biatas nigropectus	White-bearded Antshrike	Thamnophilidae
CLEMENTS	biatas nigropectus	White-bearded Antshrike	Thamnophilidae
AOU_HM	biatas nigropectus	White-bearded Antshrike	Thamnophilidae

Source details

Identifier on this site: seb_species_0111
Account identifier: seb_account_0111
Account number on the disc: 111
Source edition: CD03 / 2006 package
Original taxonomy scheme: WORLD
Structure status: heuristic; decoded_account_text and segment JSON remain authoritative