Belongs within: Furnariida.
The Rhinocryptidae, tapaculos, are a Neotropical group of small, cryptic birds with large, robust feet, long claws, and nostrils more or less covered by a membrane (Feduccia & Olson 1982).
<==Rhinocryptidae
|--+--+--ScelorchilusBKB15
| | | |--S. albicollisFO82
| | | `--S. rubeculaFO82
| | `--Pteroptochos Kittlitz 1830JT12, B94 (see below for synonymy)
| | |--P. albicollisF43
| | |--P. castaneusBKB15
| | |--P. megapodiusAP21
| | `--P. tarniiFO82
| `--+--+--Liosceles thoracicusBKB15, FO82
| | `--Psilorhamphus Sclater 1855BKB15, B94 [Psilorhamphidae]
| | `--P. guttatusBKB15
| `--+--Acropternis orthonyxBKB15
| `--+--Teledromas fuscusBKB15, FO82
| `--Rhinocrypta Gray 1840BKB15, B94 [incl. Rhinomya Geoffroy St.-Hilaire 1832B94; Rhinomyidae]
| `--R. lanceolataFO82 [=Rhynomya lanceolataF43]
`--+--+--MerulaxisBKB15
| | |--M. aterBKB15
| | `--M. stresemanniJT12
| `--EleoscytalopusBKB15
| |--E. indigoticusBKB15
| `--E. psychopompusBKB15
`--+--Myornis senilisBKB15
`--+--Eugralla paradoxaBKB15
`--Scytalopus Gould 1837BKB15, B94 [Scytalopodidae]
| i. s.: S. acutirostrisJT12
| S. altirostrisJT12
| S. alvarezlopeziAP21
| S. bolivianusJT12
| S. caracaeJT12
| S. chocoensisJT12
| S. gettyaeAP21
| S. gonzagaiAP21
| S. macropusJT12
| S. meridanusJT12
| S. opacusAP21
| S. panamensisFO82
| S. parkeriJT12
| S. perijanusAP21
| S. petrophilusAP21
| S. robbinsiJT12
| S. rodrigueziJT12
| S. sanctaemartaeJT12
| S. schulenbergiAP21
| S. simonsiJT12
| S. stilesiBKB15
| S. urubambaeJT12
|--+--+--S. speluncaeBKB15
| | `--+--S. iraiensisBKB15
| | `--+--S. novacapitalisBKB15
| | `--+--S. diamantinensisBKB15
| | `--S. pachecoiBKB15
| `--+--+--S. superciliarisBKB15
| | `--S. zimmeriBKB15
| `--+--S. fuscusJT12
| `--+--S. affinisBKB15
| `--S. canusBKB15
`--+--+--S. magellanicusBKB15
| `--+--S. atratusJT12
| `--S. unicolorJT12
`--+--S. argentifronsJT12
`--+--S. parvirostrisBKB15
`--+--+--S. latebricolaJT12
| `--S. spillmanniBKB15
`--+--S. viciniorBKB15
`--+--S. griseicollisJT12
`--+--S. latransJT12
`--+--S. femoralisJT12
`--S. micropterusJT12
Pteroptochos Kittlitz 1830BKB15, B94 [incl. Hylactes King 1831B94, Megalonyx Lesson 1832 non Jefferson 1799B94; Hylactidae, Pteroptochidae]
*Type species of generic name indicated
References
[AP21] Arlott, N., & B. van Perlo. 2021. Collins Birds of the World. William Collins.
[B94] Bock, W. J. 1994. History and nomenclature of avian family-group names. Bulletin of the American Museum of Natural History 222: 1–281.
[BKB15] Burleigh, J. G., R. T. Kimball & E. L. Braun. 2015. Building the avian tree of life using a large-scale, sparse supermatrix. Molecular Phylogenetics and Evolution 84: 53–63.
[FO82] Feduccia, A., & S. L. Olson. 1982. Morphological similarities between the Menurae and the Rhinocryptidae, relict passerine birds of the Southern Hemisphere. Smithsonian Contributions to Zoology 366: i–iv, 1–22.
[F43] Fraser, L. 1843. On the collection of birds brought to England by Mr. Bridges. Proceedings of the Zoological Society of London 11: 108–121.
[JT12] Jetz, W., G. H. Thomas, J. B. Joy, K. Hartmann & A. Ø. Mooers. 2012. The global diversity of birds in space and time. Nature 491: 444–448.