Fork-tailed Pygmy-Tyrant

hemitriccus furcatus

Tyrannidae,Elaeninae · Tyrannulets

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

The account

Description

9 cm. Eye dark. Head rufous. Above olive-green. Wings dusky with light greenish edgings on the primaries and wing coverts, and chestnut edges to the tertiary flight feathers forming a patch. Upper throat rufous with white streaks. Lower throat white. Chest flammulated gray. Belly white. Tail blackish, notched and with a white subterminal band.

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

Where it was recorded

The discs' own checklists select Fork-tailed Pygmy-Tyrant 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.

Parati PARB
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

Call is a characteristic 'tchididik' with emphasis on the first syllable. Also a 'tik-tirrr' and variations thereof.

Behavior

Found in the lower stratum of bushes and trees foraging by upward striking.

Habitat and status

Locally relatively common near borders of primary and secondary forest, woodland, secondary scrubby vegetation and thickets. Not particularly requiring bamboo growth, but we found it in bamboo thickets well within primary rain forest on the Corisco Trail at Picinguaba near Ubatuba (see picture) which might be the original habitat. This species is listed as 'endangered', because it inhabits a very small range and the population is fragmented (¹⁰³).

Distribution

The Serra do Mar from Ubatuba to Rio de Janeiro. According to Ridgely up to 1200 meters. Also in the Serra Mantiqueira and the Serra dos Orgãos.

Taxonomy notes

For more information see ¹⁷⁹

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

Calls, Ubatuba, 10/28/93, cloudy, 30°C. Secondary forest. With Chiroxiphia caudata, Attila rufus.
Call. Ubatuba,10/25/94. Cloudy, 28°C. Secondary forest, scrub.
Call. Rio Escuro, near Ubatuba, 10/13/99. Sunny, 27°C. Secondary forest. With Vireo olivaceus, Chiroxiphia caudata, Tolmomyias sulphurescens, Picumnus cirratus.
Call. Rio Escuro, near Ubatuba, 10/13/99. Sunny, 27°C. Forest. With Merulaxis ater, Herpsilochmus rufimarginatus.
Calls. Rio Escuro, near Ubatuba, 10/13/99. Sunny, 27°C. Forest. With Herpsilochmus rufimarginatus, Dysithamnus stictothorax, Saltator fuliginosus, Merulaxis ater, Drymophila ferruginea, Tolmomyias sulphurescens.

Recording files on the disc

15432.wav Calls, Ubatuba, 10/28/93, cloudy, 30°C. Secondary forest. With Chiroxiphia caudata, Attila rufus.
7159.mp3 Call. Ubatuba,10/25/94. Cloudy, 28°C. Secondary forest, scrub.
5761.wav Call. Rio Escuro, near Ubatuba, 10/13/99. Sunny, 27°C. Secondary forest. With Vireo olivaceus, Chiroxiphia caudata, Tolmomyias sulphurescens, Picumnus cirratus.
4425.wav Call. Rio Escuro, near Ubatuba, 10/13/99. Sunny, 27°C. Forest. With Merulaxis ater, Herpsilochmus rufimarginatus.
1465.wav Calls. Rio Escuro, near Ubatuba, 10/13/99. Sunny, 27°C. Forest. With Herpsilochmus rufimarginatus, Dysithamnus stictothorax, Saltator fuliginosus, Merulaxis ater, Drymophila ferruginea, Tolmomyias sulphurescens.

More images

Bamboo enclaves in primary forest. Corisco trail, Picinguaba, e. of Ubatuba. Biome of Hemitriccus furcatus. 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 — 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	hemitriccus furcatus	Fork-tailed Pygmy-Tyrant	Tyrannidae,Elaeninae
CLEMENTS	hemitriccus furcatus	Fork-tailed Pygmy-Tyrant	Tyrannidae,Elaeninae
AOU_HM	hemitriccus furcatus	Fork-tailed Pygmy-Tyrant	Tyrannidae,Elaeninae

Source details

Identifier on this site: seb_species_0231
Account identifier: seb_account_0231
Account number on the disc: 231
Source edition: CD03 / 2006 package
Original taxonomy scheme: WORLD
Structure status: heuristic; decoded_account_text and segment JSON remain authoritative