Concise hierarchy

(Kingdom) Animalia - (Phylum) Arthropoda - (Class) Arachnida

Current position

Acaromorpha ([unranked]) Dubinin, 1957

Ref: J.W. Shultz, 2007: fig. 1.

Alternative positions

Arachnida (Class) Lamarck, 1801	Ref: Z.-Q. Zhang, 2013: 18.
Arachnida (Subclass) Lamarck	Ref: R.C. Brusca & G.J. Brusca, 1990: 496.
Arachnina (Subclass)	Ref: J. Hallan, 2003-present: 7 Mar 2005.
Micrura (Subclass)	Ref: D. Grimaldi & M.S. Engel, 2005: table 3.2.

Historical positions

Chelicerata (Subphylum) Heymons, 1901	Ref: J.A. Dunlop et al., 2020: 125.
Euchelicerata ([unranked]) Weygoldt & Paulus, 1979	Ref: C. Aria et al., 2020: fig. S4. [implicit]
N.N. (Superorder)	Ref: M.A. Ruggiero et al., 2015b: 37.
Arachnida (Class) Lamarck, 1801	Ref: Z.-Q. Zhang, 2013: 18.
Arachnida (Class) Lamarck, 1801	Ref: J.A. Dunlop et al., 2012: 114. [inferred rank]
Arachnida (Class) Lamarck, 1801	Ref: Z.-Q. Zhang, 2011: 99; Prendini, 2011: 122.
Arachnida (Class) Lamarck, 1801	Ref: E.J. van Nieukerken, 2010: 159.
Micrura (Subclass)	Ref: D. Grimaldi & M.S. Engel, 2005: table 3.2.
Acaromorpha ([unranked]) Dubinin, 1957	Ref: J.A. Coddington et al., 2004: 301-302, fig. 18.1.
Arachnida (Class) Lamarck, 1801	Ref: M.S. Harvey, 2003: ix, x, 175-196.
Arachnina (Subclass)	Ref: J. Hallan, [2003]: 7 Mar 2005.
Arachnida (Subclass) Lamarck	Ref: R.C. Brusca & G.J. Brusca, 1990: 496.
Arachnida (Class) Lamarck, 1801	Ref: H.W. Levi, 1982: 95-96.
Arachnida (Class) Lamarck, 1801	Ref: T.I. Storer et al., 1979: 537-538.
Arachnida (Class) Lamarck, 1801	Ref: B. Grzimek, 1973-1975

Number of Subtaxa

2025	Available in Systema Naturae 2000	1f;3g;5s; †5f;7g
1989-present	Systema Naturae 2000: 24 Dec 2020	[1f;3g; †5f;7g]
2020	J.A. Dunlop et al.: 126	[1f; †5f;7g]
2013	Z.-Q. Zhang: 18	77*[61]s; †16s
2012	J.A. Dunlop et al.: 114, 115 (Harvey, 2003)	55s; †15s
2012	J.A. Dunlop et al.: 114, 115	55s; †15s
2011	Z.-Q. Zhang: 99	73*[58]s; †15s
2011	L. Prendini: 122 (incl. footnote 1)	2so;1f;3g;58s; †2f;4g;15s
2010	E.J. van Nieukerken: 159	58s
2010	E.J. van Nieukerken: 159	58s
2004	J.A. Coddington et al.: 301-302	1f;3g;[55s]
2004	J.A. Coddington et al.: 301-302	1f;3g;[55s]
[2003]	J. Hallan: 7 Mar 2005	3g;57s; †4g;16s
2003	M.S. Harvey: x	1f;3g;55s; †[2f]
2003	M.S. Harvey: x	1f;3g;55s; †[2f]
1990	R.C. Brusca & G.J. Brusca	3g~35s
1982	H.W. Levi	1f2g[33s]