MilliBase
Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
The last expanded taxon is highlighted
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- Myriapoda (13 583)
- Class Chilopoda (6)
- Class Diplopoda (12 940)
- Subclass Chilognatha (12 779)
- Infraclass Helminthomorpha (11 992)
- Subterclass Colobognatha (298)
- Subterclass Eugnatha (11 693)
- Superorder Juliformia (4 368)
- Order Julida (1 359)
- Order Juliformia incertae sedis
- Order Spirobolida (1 172)
- Suborder Pachybolidea accepted as Trigoniulidea
- Suborder Rhinocricidea (567)
- Suborder Spirobolidea (309)
- Family Allopocockiidae Keeton, 1960 (8)
- Family Atopetholidae Chamberlin, 1918 (51)
- Subfamily Arinolinae Hoffman & Orcutt, 1960 (14)
- Subfamily Atopetholinae Chamberlin, 1918 (15)
- Subfamily Eurelinae Hoffman & Orcutt, 1960 (20)
- Subfamily Onychelinae Hoffman & Orcutt, 1960 (1)
- Genus Gosichelus Chamberlin, 1949 accepted as Onychelus Cook, 1904
- Genus Onychelus Cook, 1904 (1)
- Species Onychelus dentatus Cook, 1911 accepted as Arinolus dentatus (Cook, 1911)
- Species Onychelus hospes Cook, 1911 accepted as Arinolus hospes (Cook, 1911)
- Species Onychelus jaegeri Chamberlin, 1947 accepted as Onychelus obustus Cook, 1904
- Species Onychelus medolus (Chamberlin, 1941) accepted as Onychelus obustus Cook, 1904
- Species Onychelus medolus Chamberlin, 1941 accepted as Onychelus medolus (Chamberlin, 1941)
- Species Onychelus michelbacheri Verhoeff, 1938 accepted as Atopetholus michelbacheri (Verhoeff, 1938)
- Species Onychelus nigrescens Chamberlin, 1923 accepted as Centrelus nigrescens (Chamberlin, 1923)
- Species Onychelus obustus Cook, 1904
- Species Onychelus phanus Chamberlin, 1941 accepted as Orthichelus phanus (Chamberlin, 1941)
- Species Onychelus smithi Chamberlin, 1947 accepted as Watichelus smithi (Chamberlin, 1947)
- Species Onychelus suturatus Cook, 1911 accepted as Arinolus dentatus (Cook, 1911)
- Species Onychelus thebanus (Chamberlin, 1941) accepted as Onychelus obustus Cook, 1904
- Genus Cyclothyrophorus Pocock, 1908 (1)
- Family Floridobolidae Keeton, 1959 accepted as Spirobolidae Bollman, 1893
- Family Hoffmanobolidae Shelley, 2001 (1)
- Family Messicobolidae Loomis, 1968 (27)
- Family Onychelidae Verhoeff, 1938 accepted as Atopetholidae Chamberlin, 1918
- Family Pseudospirobolellidae Brölemann, 1913 (15)
- Family Spirobolellidae Brölemann, 1913 (113)
- Family Spirobolidae Bollman, 1893 (89)
- Family Typhlobolellidae Hoffman, 1969 (5)
- Suborder Spiroboloidea accepted as Spirobolidea
- Suborder Trigoniulidea (293)
- Family Spirobolida incertae sedis (3)
- Order Spirostreptida (1 837)
- Superorder Merocheta (5 647)
- Superorder Nematophora (1 676)
- Order Siphoniulida (2)
- Family Hexecontasomatidae Hannibal, 2000 † (1)
- Family Oklahomasomatidae Hannibal & May, 2020 †
- Genus Dolesea Hannibal & May, 2020 †
- Infraclass Pentazonia (786)
- Order Zosterogrammida † (1)
- Subclass Penicillata (161)
- Class Euthycarcinoidea †
- Class Pauropoda (534)
- Class Symphyla (103)
