FORMICARIIDAE

The 'Formicariidae', formicariids, or 'ground antbirds' are a family of smallish passerine birds of subtropical and tropical Central and South America. They are between 10 and 20 cm (4-8 in) in length, and are related to the antbirds, Thamnophilidae, and gnateaters, Conopophagidae. This family contains probably (see below) some 100-120 species in 1 or 2 large and a number of fairly small genera.
These are forest birds that tend to feed on insects at or near the ground since many are specialist ant eaters. Most are drab in appearance with shades of (rusty) brown, black, and white being their dominant tones.
They lay two or three eggs in a nest in a tree, both sexes incubating.

Contents

Systematics

Antthrushes and Tapaculos (Formicariidae 'sensu stricto')

True antpittas (possibly own family N.N.)

References

External links

Systematics

The Formicariidae are traditionally divided into two groups, which are supported by a wide range of morphological, molecular and other evidence. The 'antthrushes' in the genera ''Formicarius'' and ''Chamaeza'' are similar in appearance to small rails. Their sexes are alike in plumage, and they walk like starlings. The ''thrush'' part of the name refers only to the similarity in size (and in ''Chamaeza'' also coloration) to true thrushes, not to an evolutionary relationship.
The 'antpittas' in the genera ''Grallaria'', ''Hylopezus'', ''Myrmothera'' and ''Grallaricula'' are also sexually monomorphic; they resemble the true pittas in that they are virtually tailess; they hop like thrushes, and are much easier to hear than see - although their vocalizations may be rather untypical for perching birds.
Recent research (Irestedt ''et al.'' 2002, Rice 2005a,b) indicates that the Formicariidae as previously delimited are highly paraphyletic, judging from comparison of several mt and nDNA sequences. The aberrant bar-bellied "antpittas" of the genus ''Pittasoma'' which were formerly placed here belong to the gnateater family (which initially was also considered formicariids); as the gnateaters proper, they are sexually dichromatic. On the other hand, at least a large proportion of the Rhinocryptidae ('tapaculos'), including the type genus ''Rhinocrypta'', seem to be closer to the antthrushes than these are to the antpittas.
Very little molecular data is currently available for rhinocryptids, which are moreover rather non-diagnostic morphologically. As relationships with related groups such as ovenbirds have not been fully resolved, it is certain that the systematics of the group will be revised soon, but it is not clear how exactly the new systematic lineup will be. On the other hand, morphological, behavioral and molecular analyses of the true antpittas agree astoundingly well as regards their internal systematics, considering the high amount of lifestyle-related homoplasies in the birds discussed here.
Barring a closer relationship of any of the three groups - antthrushes, tapaculos, and antpittas - to other suboscines, three basic approaches are possible:
#Some or all Rhinocryptidae would be merged into the Formicariidae. "Rhinocryptidae" would have to be abolished as a family-level taxon, and if that group is not entirely merged into the Formicariidae, the remaining genera would receive a new family name. The Formicariidae would then contain an antthrush-tapaculo subfamily, possibly with two separate tribes, and one or two antpitta tribes as per 2. in another subfamily.
#It is alternatively possible to split the group into two families, of which one would contain the antthrushes and some or all tapaculos and their allies in two subfamilies and bear the name Formicariidae. The other family would contain the antpittas and receive a new name; it would also contain two subfamilies, one consisting of the typical ''Grallaria'' antpittas and the other of the usually smaller species of the remaining genera.
#Finally, all three major lineages - antthrushes, tapaculos and allies, and antpittas - could be considered separate families. Phylogenetically, it might even be deemed appropriate to split the antpittas into two families (one containing only ''Grallaria'' and the other the remaining genera) though this would probably be considered oversplitting.
Altogether, a two-and-four layout (subfamilies/families and tribes/subfamilies - optins 1 and 2, respectively) seems to represent the phylogeny of these birds best; a three-lineage approach (option 3) might be warranted if some other families are also part of the Formicariidae-Rhinocryptidae clade. Whether the typical antthrushes and tapaculos should be separated from the antpittas at the family level is not yet clear. It depends on whether or not the gnateaters and true antbirds are closer to the true antpittas than to the antthrush-tapaculo clade; there is some - albeit very tentative - indication that splitting off the true antpittas as a distinct family (option 2) is indeed more warranted (Rice 2005a).

Antthrushes and Tapaculos (Formicariidae 'sensu stricto')

'Typical antthrushes' - tribe 'Formicariini'/subfamily 'Formicariinae'

★ 'Genus ''Formicarius'''

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★ Rufous-capped Antthrush, ''Formicarius colma''

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★ Black-headed Antthrush, ''Formicarius nigricapillus''

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★ Black-faced Antthrush, ''Formicarius analis''

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★ Rufous-fronted Antthrush, ''Formicarius rufifrons''

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★ Rufous-breasted Antthrush, ''Formicarius rufipectus''

★ 'Genus ''Chamaeza'''

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★ Striated Antthrush, ''Chamaeza nobilis''

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★ Short-tailed Antthrush, ''Chamaeza campanisona''

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★ Brazilian Antthrush, ''Chamaeza ruficauda''

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★ Schwartz's Antthrush, ''Chamaeza turdina''

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★ Such's Antthrush, ''Chamaeza meruloides''

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★ Barred Antthrush, ''Chamaeza mollissima''
'Tapaculos' - possibly tribe 'Rhinocryptini'/subfamily 'Rhinocryptinae' (tentatively placed here)

★ 'Genus ''Pteroptochos'''

★ 'Genus ''Scytalopus'''

★ 'Genus ''Rhinocrypta'''

★ 'Genus ''Liosceles'''
and probably other genera

True antpittas (possibly own family N.N.)

'Typical antpittas' - tribe 'Grallariini'/subfamily 'Grallariinae'

★ 'Genus ''Grallaria'''

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★ Undulated Antpitta, ''Grallaria squamigera''

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★ Giant Antpitta, ''Grallaria gigantea''

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★ Great Antpitta, ''Grallaria excelsa''

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★ Variegated Antpitta, ''Grallaria varia''

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★ Scaled Antpitta, ''Grallaria guatimalensis''

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★ Moustached Antpitta, ''Grallaria alleni''

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★ Táchira Antpitta, ''Grallaria chthonia''

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★ Plain-backed Antpitta, ''Grallaria haplonota''

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★ Ochre-striped Antpitta, ''Grallaria dignissima''

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★ Elusive Antpitta, ''Grallaria eludens''

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★ Santa Marta Antpitta, ''Grallaria bangsi''

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★ Chestnut-crowned Antpitta, ''Grallaria ruficapilla''

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★ Cundinamarca Antpitta, ''Grallaria kaestneri''

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★ Watkins' Antpitta, ''Grallaria watkinsi''

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★ Stripe-headed Antpitta, ''Grallaria andicola''

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★ Bicolored Antpitta, ''Grallaria rufocinerea''

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★ Chestnut-naped Antpitta, ''Grallaria nuchalis''

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★ Jocotoco Antpitta, ''Grallaria ridgelyi''

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★ Pale-billed Antpitta, ''Grallaria carrikeri''

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★ Yellow-breasted Antpitta, ''Grallaria flavotincta''

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★ White-bellied Antpitta, ''Grallaria hypoleuca''

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★ Rusty-tinged Antpitta, ''Grallaria przewalskii''

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★ Bay Antpitta, ''Grallaria capitalis''

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★ Red-and-white Antpitta, ''Grallaria erythroleuca''

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★ White-throated Antpitta, ''Grallaria albigula''

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★ Gray-naped Antpitta, ''Grallaria griseonucha''

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★ Rufous Antpitta, ''Grallaria rufula''

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★ Chestnut Antpitta, ''Grallaria blakei''

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★ Rufous-faced Antpitta, ''Grallaria erythrotis''

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★ Tawny Antpitta, ''Grallaria quitensis''

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★ Brown-banded Antpitta, ''Grallaria milleri''
'Lesser antpittas' - possibly tribe 'Myrmotherini'/subfamily 'Myrmotherinae'

★ 'Genus ''Hylopezus'''

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★ Spotted Antpitta, ''Hylopezus macularius''

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★ Streak-chested Antpitta, ''Hylopezus perspicillatus''

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★ Masked Antpitta, ''Hylopezus auricularis''

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★ Fulvous-bellied Antpitta, ''Hylopezus dives''

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★ White-lored Antpitta, ''Hylopezus fulviventris''

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★ Amazonian Antpitta, ''Hylopezus berlepschi''

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★ White-browed Antpitta, ''Hylopezus ochroleucus''

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★ Speckle-breasted Antpitta, ''Hylopezus nattereri''

★ 'Genus ''Myrmothera'''

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★ Thrush-like Antpitta, ''Myrmothera campanisona''

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★ Tepui Antpitta, ''Myrmothera simplex''

★ 'Genus ''Grallaricula'''

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★ Ochre-breasted Antpitta, ''Grallaricula flavirostris''

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★ Rusty-breasted Antpitta, ''Grallaricula ferrugineipectus''

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★ Scallop-breasted Antpitta, ''Grallaricula loricata''

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★ Hooded Antpitta, ''Grallaricula cucullata''

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★ Peruvian Antpitta, ''Grallaricula peruviana''

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★ Ochre-fronted Antpitta, ''Grallaricula ochraceifrons''

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★ Slate-crowned Antpitta, ''Grallaricula nana''

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★ Crescent-faced Antpitta, ''Grallaricula lineifrons''

References

★ 'Irestedt', Martin; Fjeldså, Jon; Johansson, Ulf S. & Ericson, Per G.P. (2002): Systematic relationships and biogeography of the tracheophone suboscines (Aves: Passeriformes). ''Molecular Phylogenetics and Evolution'' '23'(3): 499–512. (HTML abstract)

★ 'Rice', Nathan H. (2005a): Phylogenetic relationships of antpitta genera (Passeriformes: Formicariidae). ''Auk'' '122'(2): 673-683. [English with Spanish abstract] DOI:10.1642/0004-8038(2005)122[0673:PROAGP]2.0.CO;2 PDF fulltext

★ 'Rice', Nathan H. (2005b): Further Evidence for Paraphyly of the Formicariidae (Passeriformes). ''Condor'' '107'(4): 910-915. [English with Spanish abstract] PDF fulltext

External links

★ Formicariidae videos on the Internet Bird Collection