Archaeocalamitaceae

Archaeocalamitaceae is a family of extinct sphenopsids related to horsetails. Archaeocalamite fossils have been found in Siberia, Poland, and Brazil. The fossils date to the Middle Devonian-Carboniferous, lower Carboniferous (Dinantian), and the lower Permian respectively.^[1][2][3] Given the distance of the fossil discoveries, archaeocalamites may have had a subcosmopolitan distribution.^{[citation needed]}

Archaeocalamitaceae Temporal range: Middle Devonian–Lower Permian PreꞒ Ꞓ O S D C P T J K Pg N
Archaeocalamites
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Subclass:	Equisetidae
Order:	Equisetales
Family:	†Archaeocalamitaceae Koidz.
Genera
†Archaeocalamites †Paragiridia †Radiatus †Scrobiculatus

Taxonomy

Possible relationships archaeocalamites has with other sphenopids is shown below.^[4]

	?†Ibyka †Pseudobornia ursina †Sphenophyllales †Archaeocalamitaceae †Calamitaceae Equisetaceae