"Silveira's" Antwren

formicivora sp.nov

Thamnophilidae · Antbirds, Antwrens

Disc 2 · 2001 not listed
Disc 3 · 2006 listed
Disc 1 · 2011 listed

The account

Description

10 cm. A newly described Formivora from swamps close to São Paulo City. The following description was provided by Dr. Luis Fabio Silveira, Universidade de Sao Paulo, SP. Smaller than Formicivora acutirostris. Bill shorter than in Formicivora acutirostris. Male with black belly and more pronounced white superciliary and infraocular white crescent; white markings on black front prominent; back olive brown, wings black, wing coverts black, tipped white; white wing bar, tail black, tipped white, throat, chest and belly black; lower flanks and crissum dark olive brown. Female with whitish throat, chest and belly coarsely streaked black.

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 "Silveira's" Antwren at 2 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.

Aruja AJSB
Biritiba Mirim BMSB

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

A loose sequence of double notes 'tju-tip tju-tip tju-tip . . . . . '

Behavior

Forages low in high vegetation.

Habitat and status

Local in swamps with high vegetation.

Distribution

Discovered in February 2005 by Louis Fabio Silveira, Departamento de Zoologia do Instituto de Biociencias da Universidade São Paulo near Biritiba Mirim, SE of São Paulo City. Dante Buzetti found the species near Aruja close to the Guarulhos airport near Sao Paulo city at the same time. 700 meters

Taxonomy notes

Please contact Dr. Luis Fabio Silveira (lfsilveira@usp.br) if you encounter this species in the field.

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, February 2005, Biritiba-Mirim, São Paulo,swamp. Recorded by Luis Fabio Silveira.

Recording files on the disc

6042.mp3 Song, February 2005, Biritiba-Mirim, São Paulo,swamp. Recorded by Luis Fabio Silveira.

More images

photograph by Edson Endrigo Disc 3 · 2006
photograph by Edson Endrigo Disc 3 · 2006

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 — not 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 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.

Names by release

The 2011 Disc 1 revision changed this bird's English name. Both historical names are preserved; neither replaces the other.

"Silveira's" Antwren formicivora sp.nov Disc 3 · 2006
Sao Paulo Antwren formicivora sp.nov Disc 1 · 2011

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	formicivora sp.nov	"Silveira's" Antwren	Thamnophilidae
CLEMENTS	sp.nov	None	Thamnophilidae
AOU_HM	sp.nov	None	Thamnophilidae

Source details

Identifier on this site: seb_species_0134
Account identifier: seb_account_0134
Account number on the disc: 134
Source edition: CD03 / 2006 package
Original taxonomy scheme: WORLD
Structure status: heuristic; decoded_account_text and segment JSON remain authoritative