Rio de Janeiro Antwren
myrmotherula fluminensis
Thamnophilidae · Antbirds, Antwrens
- Disc 2 · 2001 listed
- Disc 3 · 2006 listed
- Disc 1 · 2011 listed
The account
Description
9.5 cm. The male is similar to Myrmotherula iheringi. Bluish-grey above. Wing coverts black with broad white tips. Primaries and secondaries grey. Chin to belly black shading to grey on lower belly. The male differs from Myrmotherula minor which apparently occurs in the same habitat, by having the black bib extending onto the belly.
I know of no description of the female.
-
Male Disc 3 · 2006
Where it was recorded
The discs' own checklists select Rio de Janeiro Antwren at 1 locality.
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
Voice
Similar to vocalizations of Myrmotherula axillaris. Juan Mazar Barnett recorded a 'ziu ziu', a 'zrriu' and a 'zirrrr'.
Behavior
The type specimen was mist-netted in a disturbed and isolated wood lot. At Reserva Ecologica Guapiacú the birds were seen foraging in middle and lower storey of dense secondary and primary rainforest (Juan Mazar Barnett).
Habitat and status
Very rare in dense rainforest.
Distribution
Type specimen (1982) from 4 km southeast of Santo Aleixo, Majé, Rio de Janeiro (22°34'45"S, 43°01'39" W). This location is in the foothills of the Serra dos Órgãos and it is thought that the bird was a straggler from the Serra dos Órgãos. A population was found in 1997 by S. Knapp and A. Foster at Reserva Ecológica Guapiacú, 60 km northeast of Rio de Janeiro near Cachoeiras de Macacu, Estado Rio de Janeiro (62) and antwrens fitting the description for this species by Gonzaga were observed at the same location by Guy Kirwan and Juan Mazar Barnett in February and March 1997.
Taxonomy notes
A recently described antwren from Estado Rio de Janeiro (63). Its rarity might be based on loss of suitable habitat. Sibley and Monroe (99) consider the type specimen to be a hybrid between Myrmotherula axillaris and Myrmotherula unicolor but this is unlikely (28), because several were seen together at different occasions. It might be a local morph of Myrmotherula axillaris (103). For more information see 173
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, Refugio da Serra do Mar, near Cachoeira de Macacu, Rio de Janeiro, 3/97. With Habia rubica. Recording by Juan Mazar Barnett.
-
Calls, Fazenda da Serra do Mar, near Cachoeira de Macacu, Rio de Janeiro, 3/97. Recording by Juan Mazar Barnett.
Recording files on the disc
- 7951.mp3 Calls, Refugio da Serra do Mar, near Cachoeira de Macacu, Rio de Janeiro, 3/97. With Habia rubica. Recording by Juan Mazar Barnett.
- 14476.mp3 Calls, Fazenda da Serra do Mar, near Cachoeira de Macacu, Rio de Janeiro, 3/97. Recording by Juan Mazar Barnett.
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: distribution. The complete earlier text is shown beneath each truncated section.
Description Disc 1 · 2011
9.5 cm. The male is similar to Myrmotherula iheringi. Bluish-grey above. Wing coverts black with broad white tips. Primaries and secondaries grey. Chin to belly black shading to grey on lower belly. The male differs from Myrmotherula minor which apparently occurs in the same habitat, by having the black bib extending onto the belly.
I know of no description of the female.
Voice Disc 1 · 2011
Similar to vocalizations of Myrmotherula axillaris. Juan Mazar Barnett recorded a 'ziu ziu', a 'zrriu' and a 'zirrrr'.
Behavior Disc 1 · 2011
The type specimen was mist-netted in a disturbed and isolated wood lot. At Reserva Ecologica Guapiacú the birds were seen foraging in middle and lower storey of dense secondary and primary rainforest (Juan Mazar Barnett).
Habitat and status Disc 1 · 2011
Very rare in dense rainforest.
Distribution Disc 1 · 2011
Type specimen (1982) from 4 km southeast of Santo Aleixo, Majé, Rio de Janeiro (22°34'45"S, 43°01'39" W). This location is in the foothills of the Serra dos Órgãos and it is thought that the bird was a straggler from the Serra dos Órgãos. A population was found in 1997 by S. Knapp and A. Foster at Reserva Ecológica Guapiacú, 60 km northeast of Rio de Janeiro near Cachoeiras de Macacu, Estado Rio de Janeiro (62) and antwrens fitting the description for this species by Gonzaga were observed at the same loca
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 (69 bytes lost in 2011)
Type specimen (1982) from 4 km southeast of Santo Aleixo, Majé, Rio de Janeiro (22°34'45"S, 43°01'39" W). This location is in the foothills of the Serra dos Órgãos and it is thought that the bird was a straggler from the Serra dos Órgãos. A population was found in 1997 by S. Knapp and A. Foster at Reserva Ecológica Guapiacú, 60 km northeast of Rio de Janeiro near Cachoeiras de Macacu, Estado Rio de Janeiro (62) and antwrens fitting the description for this species by Gonzaga were observed at the same location by Guy Kirwan and Juan Mazar Barnett in February and March 1997.
Shown for comparison from the Disc 3 · 2006; it does not repair or replace the Disc 1 · 2011 historical text above.
Taxonomy notes Disc 1 · 2011
A recently described antwren from Estado Rio de Janeiro (63). Its rarity might be based on loss of suitable habitat. Sibley and Monroe (99) consider the type specimen to be a hybrid between Myrmotherula axillaris and Myrmotherula unicolor but this is unlikely (28), because several were seen together at different occasions. It might be a local morph of Myrmotherula axillaris (103). For more information see 173
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 | myrmotherula fluminensis | Rio de Janeiro Antwren | Thamnophilidae |
| CLEMENTS | myrmotherula fluminensis | Rio de Janeiro Antwren | Thamnophilidae |
| AOU_HM | myrmotherula fluminensis | Rio de Janeiro Antwren | Thamnophilidae |
Source details
- Identifier on this site
- seb_species_0126
- Account identifier
- seb_account_0126
- Account number on the disc
- 126
- Source edition
- CD03 / 2006 package
- Original taxonomy scheme
- WORLD
- Structure status
- heuristic; decoded_account_text and segment JSON remain authoritative