Chapman's Antshrike     Thamnophilus zarumae
Chapman   1921
sw Ecuador: e El Oro, s Loja; nw Peru: s to Lambayeque. Scrub, secondary woodland of arid to semi-humid regions.
split from: Thamnophilus doliatus
insert after: Thamnophilus doliatus
Robert S. Ridgely & Guy Tudor,
The Birds of South America, Volume II, The Suboscine Passerines, Oxford, 1994, p. 229
 

Lined Antshrike      Thamnophilus tenuepunctatus
Lafresnaye   1853
c,s Colombia: Norte de Santander and Cundinamarca & w Meta s to w Putumayo ; e Ecuador: w Napo s to Zamora-Chinchipe; n Peru: n Cajamarca, Amazonas and n San Martín. Along e base of Andean range
split from: Thamnophilus palliatus
insert after: Thamnophilus multistriatus
Robert S. Ridgely & Guy Tudor,
The Birds of South America, Volume II, The Suboscine Passerines, Oxford, (1994)

Included here are a number of recordings of so-called "loudsongs" of slaty-antshrikes.   Judging from the Isler/Isler/Whitney paper, the samples here are fairly typical utterances for the respective forms.
In Western, listen for the distinctive upslur (formed by last two notes) at the end of the phrase.  There is no acceleration.

This short cut is part of a longer track appearing on the CD-ROM Birds of Venezuela.
© Peter Boesman. Recorded April 15, 1995, Darien Cana, Panama.

Western Slaty-Antshrike     Thamnophilus atrinucha
Salvin & Godman   1892
se Guatemala; s Belize; nw Honduras; c Nicaragua; Costa Rica, Panama (Carib. slope); w Colombia; w Ecuador; nw Venezuela
split from: Thamnophilus punctatus
insert after: Thamnophilus aroyae
E. O. Willis,
Antshrikes (Formicariidae) as army ant followers
Papéis Avulsos Zool. 35, 17 (1984): 177-182
 

The loudsong of Guianan has very widely spaced notes compared to the songs of other forms. This renders the number of notes almost countable, numbering around 10.

This short cut is also part of a longer track appearing on the CD-ROM Birds of Venezuela.
© Peter Boesman. Recorded November 3, 1993, Lower Rio Caura, Bolivar, Venezuela. (This is the nominate race.)

Guianan Slaty-Antshrike     Thamnophilus punctatus
(Shaw)   1809
e Colombia, sw Venezuela (interpositus); c,e Venezuela; Guianas; Surinam; n Brazil: north of Amazon (nominate)

This is the former nominate race, now only including interpositus still.
 

Natterer's loudsong has the slowest start of all, accelerating to an average 19 notes per phrase, which gives it also the longest phrase (over 3 sec) of all.
This cut has a pair duetting.

This short cut is part of a longer track appearing on the CD-ROM Birds of Bolivia.
© Sjoerd Maijer. Recorded March 6, 1994, Noel Kempff Mercado NP, Bolivia.

Natterer's Slaty-Antshrike     Thamnophilus stictocephalus
Pelzeln   1868
c Brazil: south of Amazon in Pará and Mato Grosso (nominate); n Beni (race?), ne Bolivia: ne Santa Cruz, Serranía de Huanchaca (parkeri)
split from: Thamnophilus punctatus
insert after: Thamnophilus punctatus
Morton L. Isler, Phyllis R. Isler & Bret M. Whitney,
Biogeography and systematics of the Thamnophilus punctatus (Thamnophilidae) complex
in Ornithological Monographs 48, Studies in Neotropical Ornithology honoring Ted Parker (1997), 355-381
 

Bolivian's loudsong is also distinctive, being short (2 sec) yet still approximately 20 notes, of which the notes 13-19 are raised in pitch.

This short cut is also part of a longer track appearing on the CD-ROM Birds of Bolivia.
© Sjoerd Maijer. Recorded February 14, 1994, approx. 100 km ne of city of Santa Cruz, Bolivia.

Bolivian Slaty-Antshrike     Thamnophilus sticturus
Pelzeln   1868
ce Bolivia: sw Beni, e Cochabamba, Santa Cruz; sw Brazil: sw Mato Grosso
split from: Thamnophilus punctatus
insert after: Thamnophilus stictocephalus
Morton L. Isler, Phyllis R. Isler & Bret M. Whitney,
Biogeography and systematics of the Thamnophilus punctatus (Thamnophilidae) complex
in Ornithological Monographs 48, Studies in Neotropical Ornithology honoring Ted Parker (1997), 355-381
 

Planalto's loudsong is rather similar to that of Sooretama, though the phrase duration is shorter (1.7 sec on average against 2.0 sec), and the initial notes are closer together.   This gives a fast but not very accelerated effect.

Two-phrase cut, © Juan Mazar Barnett.  Recorded July 18/19, 1998, Boa Nova, Bahia, Brazil. The bird in the background is believed to be Brown-crested Flycatcher.

Planalto Slaty-Antshrike     Thamnophilus pelzelni
Hellmayr   1924
ne,s Brazil: Maranhão, Piauí, Ceará and Paraíba s to s Bahia, nw Minas Gerais and São Paulo, w to e,s Mato Grosso and c Mato Grosso do Sul
split from: Thamnophilus punctatus
insert after: Thamnophilus sticturus
Morton L. Isler, Phyllis R. Isler & Bret M. Whitney,
Biogeography and systematics of the Thamnophilus punctatus (Thamnophilidae) complex
in Ornithological Monographs 48, Studies in Neotropical Ornithology honoring Ted Parker (1997), 355-381
 

Finally, Sooretama's loudsong starts with well-spaced notes, then clearly accelerates.  On average, the duration of a phrase is 2.0 sec, but as with the other forms there is a great deal of individual variation.

Short cut from a longer recording, © Rolf A. de By. Recorded December 28, 1998, Parque Florestal Rio Doce, e Minas Gerais, Brazil.

Sooretama Slaty-Antshrike     Thamnophilus ambiguus
Swainson   1825
e,se Brazil: s Sergipe, e Bahia, e Minas Gerais, Espírito Santo, Rio de Janeiro
split from: Thamnophilus punctatus
insert after: Thamnophilus pelzelni
Morton L. Isler, Phyllis R. Isler & Bret M. Whitney,
Biogeography and systematics of the Thamnophilus punctatus (Thamnophilidae) complex
in Ornithological Monographs 48, Studies in Neotropical Ornithology honoring Ted Parker (1997), 355-381
 

Saturnine Antshrike     Thamnomanes saturninus
(Pelzeln)   1868
ne Peru: Loreto s of Amazon; w,c Brazil: Amazonas, s of Amazon
split from: Thamnomanes ardesiacus
insert after: Dysithamnus occidentalis
Robert S. Ridgely & Guy Tudor,
The Birds of South America, Volume II, The Suboscine Passerines, Oxford, 1994
 

Pacific Antwren     Myrmotherula pacifica
Hellmayr   1911
Panama; w Colombia; w Ecuador
split from: Myrmotherula surinamensis
insert after: Myrmotherula surinamensis
Morton L. Isler, Phyllis R. Isler & Bret M. Whitney,
Species limits in Antbirds (Passeriformes: Thamnophilidae): the Myrmotherula surinamensis complex
The Auk 116, 1 (1999): 83-96
 

Amazonian Streaked-Antwren     Myrmotherula multostriata
Sclater   1858
c Colombia: Meta (isolated records); ne Ecuador; e Peru: Loreto s to Madre de Dios; ne Brazil: ne Pará s to c Mato Grosso, Amazonas and Rondonia mostly s of Amazon River; n,ne Bolivia
split from: Myrmotherula surinamensis
insert after: Myrmotherula pacifica
Morton L. Isler, Phyllis R. Isler & Bret M. Whitney,
Species limits in Antbirds (Passeriformes: Thamnophilidae): the Myrmotherula surinamensis complex
The Auk 116, 1 (1999): 83-96
 

The Sibley & Monroe list already had an Alagoas Antwren listed, namely Terenura sicki, which is a different bird.  That taxon has an alternative vernacular name in Orange-bellied Antwren (Ridgely & Tudor), which we will use from here onwards.

Alagoas Antwren     Myrmotherula snowi
Teixeira & Gonzaga   1985
ne Brazil: Alagoas near Murici.  Lower growth, midstory of humid forest and mature woodland
split from: Myrmotherula unicolor
insert after: Myrmotherula unicolor
Brett M. Whitney & José Fernando Pacheco,
Behavior, vocalisations, and relationships of some Myrmotherula antwrens (Thamnnophilidae) in eastern Brazil, with comments on the "Plain-winged" group
in Ornithological Monographs 48, Studies in Neotropical Ornithology honoring Ted Parker (1997), 809-819
 

Dugand's Antwren     Herpsilochmus dugandi
Meyer de Schauensee   1945
s Colombia: w Caquetá and se Amazonas; e Ecuador: Napo s to Morona-Santiago; ne Peru: Loreto n of Río Marañón and Amazon River. Canopy of humid terra firme (sometimes várzea) forests to 400 m
split from: Herpsilochmus sticturus
insert after: Herpsilochmus sticturus
Robert S. Ridgely & Guy Tudor,
The Birds of South America, Volume II, The Suboscine Passerines, Oxford, 1994, p. 257
 

Restinga Antwren was described in 1990 as a new subspecies of Serra Antwren (Formicivora serrana) by Gonzaga and Pacheco.  They suggested it might be a full species.  It is considered as such by Ridgely & Tudor on the basis of clear morphological differences and distinctly different habitat.

Restinga Antwren     Formicivora littoralis
Gonzaga & Pacheco   1990
se Brazil: c Rio de Janeiro state, Cabo Frio.  Coastal restinga scrub
split from: Formicivora serrana
insert after: Formicivora serrana
Luiz A. Pedreira Gonzaga & José Fernando Pacheco,
Two new subspecies of Formicivora serrana (Hellmayr) from south-eastern Brazil, and notes on the type-locality of Formicivora deluzae (Ménétriès)
Bulletin B.O.C. 110, 4 (1990): 187-193
 

Single-phrase duet from a recording of Willis's Antbird, C.l. sabinoi,   © Tom Gullick. Recorded February 16, 1996, Fazenda Bananeira, Alagoas, Brazill.

Rainy cut from another recording of Willis's Antbird, nominate race, © Tom Gullick. Recorded February 19, 1996, Guamá Ecological Research Area, Pará, Brazil.

Problems playing sounds?

Willis's Antbird     Cercomacra laeta
Todd   1920
n,ne Brazil: e Pará & ne Maranhão (laeta), e Alagoas & se Pernambuco (sabinoi), e Amazonas & e Roraima (four specimens only of waimiri)
split from: Cercomacra tyrannina
insert after: Cercomacra tyrannina
Richard O. Bierregaard, Jr., Mario Cohn-Haft & Douglas F. Stotz,
Cryptic biodiversity: An overlooked species and new subspecies of Antbird (Aves: Formicariidae) with a revision of Cercomacra tyrannina in northeastern South America
in Ornithological Monographs 48, Studies in Neotropical Ornithology honoring Ted Parker, 1997, p. 111-128
 

Amazonas Antbird     Percnostola minor
Pelzeln   1868
se Colombia: e Vaupés, Guainía, s Vichada; s Venezuela: w,c Amazonas; ne Brazil: ne Amazonas (all minor); ne Peru: c Loreto (jensoni)
split from: Percnostola rufifrons
insert after: Percnostola rufifrons
A. P. Capparella, Gary H. Rosenberg & Steven W. Cardiff,
A new subspecies of Percnostola rufifrons (Formicariidae) from northeastern Amazonian Peru, with a revision of the rufifrons complex
in Ornithological Monographs 48, Studies in Neotropical Ornithology honoring Ted Parker, 1997, p. 165-170

Northern Chestnut-tailed Antbird      Myrmeciza castanea
Zimmer   1932
s Colombia: Putumayo; e Ecuador: Pastaza, Zamora-Chinchipe; ne Peru: Loreto, Amazonas, San Martín
split from: Myrmeciza hemimelaena
insert after: Myrmeciza hemimelaena
Morton L. Isler, José Alvarez Alonso, Phyllis R. Isler, Thomas Valqui, Alfredo Begazo & Bret M. Whitney,
Rediscovery of a crypric species and description of a new subspecies in the Myrmeciza hemimelaena complex (Thamnophilidae) of the Neotropics
The Auk 119, 2, (2002): 362-378