Concise hierarchy

(Kingdom) Plantae - (Phylum) Tracheophyta - (Class) Isoëtopsida

Current position

Isoëtopsida (Class) Rolle (1884)

Ref: Новіков, А. & Барабаш-Красни, Б. / Novikoff, A. & Barabasz-Krasny, B., 2015: 46.

Alternative positions

Isoetopsida (Subdivision)	Ref: J.T. Mickel, 1982: 339.
Isoetopsida (Class) Rolle (1885)	Ref: S.P. Parker, 1982: 1079. [alternative position]
lycophytes ([unranked])	Ref: K.M. Pryer et al., 2004: fig. 10.3. [inferred rank]
Lycopodiidae (Subclass) Bek. (1863)	Ref: D.J. Mabberley, 2017: App. (p. 997).
Lycopodinae (Class)	Ref: L.J. Audus & V. Heywood, 1981: 1359.
Lycopodiopsida (Class) Bartl. (1830)	Ref: Schmidt et al., 2022: 183
Lycopsida (Class)	Ref: T.N. Taylor et al., 2009: table (p. 266).
Selaginellopsida (Class) A.B.Frank (1874)	Ref: A.B. Doweld, 2001: IV.

Historical positions

Lycopodiidae (Subclass) Bek. (1863)	Ref: D.J. Mabberley, 2017: App. (p. 997).
Lycopodiopsida (Class) Bartl. (1830)	Ref: PPG I, 2016: 570.
Lycopodiopsida (Class) Bartl. (1830)	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 31).
Isoëtopsida (Class) Rolle (1884)	Ref: A. Novikoff & B. Barabasz-Krasny, 2015: 46.
Lycopsida (Class)	Ref: T.N. Taylor et al., 2009: table (p. 266), App. 1 (p. 1028).
Lycopodiopsida (Class) Bartl. (1830)	Ref: D.J. Mabberley, 2008: 507, 928.
lycophytes ([unranked])	Ref: K.M. Pryer et al., 2004: fig. 10.3.
Selaginellopsida (Class) A.B.Frank (1874)	Ref: A.B. Doweld, 2001: IV.
Lycopsida (Class)	Ref: P. Kenrick & P.R. Crane, 1997a: table 7.1 (p. 228).
Lycopsida (Class)	Ref: C.J. Cleal & B.A. Thomas, 1995: 13.
Isoetopsida (Subdivision)	Ref: J.T. Mickel, 1982: 339.
Isoetopsida (Class) Rolle (1885)	Ref: S.P. Parker, 1982: 1079. [alternative position]
Lycopodinae (Class)	Ref: L.J. Audus & V. Heywood, 1981: 1359.

Number of Subtaxa

2024	Available in Systema Naturae 2000	1f;1g;7s; †2f;3g
1989-present	Systema Naturae 2000: 16 Feb 2023	[1f;1g; †2f;3g]
2017	D.J. Mabberley: 846, App. (p. 997)	[1f;1g]
2016	PPG I: 570	[1f;1g]
2015	A. Novikoff & B. Barabasz-Krasny: 46	[1f;1g; †2f;2g]
2008	D.J. Mabberley	[1f;1g;700s; †1g]
2001	A.B. Doweld: IV	[1f; †1f]
1995	C.J. Cleal & B.A. Thomas: 13	[1f]
1982	J.T. Mickel	1f1g700s
1981	L.J. Audus & V. Heywood	~700s