Gray-bellied Spinetail

synallaxis cinerascens

Furnariidae,Synallaxinae · Spinetails, Castaneros

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

The account

Description

5.5" Uniformly olive-brown above with rufous wing coverts and primaries. A white chin spot and a black throat patch. Below slaty gray, the lower flanks olivaceous. Tail chestnut-brown.

Immature is similar to the adult, but paler and with a less distinct throat patch. The chest and belly of the immature bird are grayish white with light brown flammulated streaking. The flanks are light brown as in the adult and the center of the abdomen is buffy white (⁵⁰).

The disc records this picture against the bird without a caption. Disc 3 · 2006

Where it was recorded

The discs' own checklists select Gray-bellied Spinetail at 7 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.

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 'sii du dit' several times repeated, the second syllable with a somewhat lower pitch. Can also be heard on ¹¹.

Behavior

Inside undergrowth of dense humid forest, difficult to see.

Habitat and status

Uncommon in the understory of humid highland forest, not associated with forest borders and frequently far away from the forest edge.

Distribution

Throughout, mostly in the coastal ranges, but also at Itatiaia and the Serra dos Orgãos. To about 1200 meters on Itatiaia.

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, 11/30/97. Sunny, 27°C. Primary forest understory with bamboo. With Procnias nudicollis, Attila phoenicurus.
Song. Cornell Cat#23712. Misiones, Argentina, Iguazu National Park, 11/04/80. With Basileuterus leucoblepharus, Vireo olivaceus. Recording by T. A. Parker, Jr.

Recording files on the disc

442.mp3 Song. Fazenda Intervales, 11/30/97. Sunny, 27°C. Primary forest understory with bamboo. With Procnias nudicollis, Attila phoenicurus.
2983.wav Song. Cornell Cat#23712. Misiones, Argentina, Iguazu National Park, 11/04/80. With Basileuterus leucoblepharus, Vireo olivaceus. Recording by T. A. Parker, Jr.

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	synallaxis cinerascens	Gray-bellied Spinetail	Furnariidae,Synallaxinae
CLEMENTS	synallaxis cinerascens	Gray-bellied Spinetail	Furnariidae,Synallaxinae
AOU_HM	synallaxis cinerascens	Gray-bellied Spinetail	Furnariidae,Synallaxinae

Source details

Identifier on this site: seb_species_0070
Account identifier: seb_account_0070
Account number on the disc: 70
Source edition: CD03 / 2006 package
Original taxonomy scheme: WORLD
Structure status: heuristic; decoded_account_text and segment JSON remain authoritative