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Catalogue of Diatom Names, On-Line Version, Updated 19 Sep 2011
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Gyrosigma A.H. Hassall Jul-Dec 1845, pg. 435
Generitype T: Gyrosigma hippocampus (C.G. Ehrenberg 1838) A.H. Hassall 1845 ('hippocampa') nom. illeg. (= Navicula hippocampus C.G. Ehrenberg 1838 nom. illeg.) [Frustulia attenuata Kützing, Gyrosigma attenuatum (Kützing) Rabenhorst]
Designated by ICBN 1956 (ref. 006916), p. 201
Year Designated 1956
Nomenclatural status nom. cons.
Recent revisions Sterrenburg 1994 (ref. 006784)
Comments Name conserved vs. Scalptrum Corda 1835 (nom. rej. taxonomic synonym) (see ICBN 1956, p. 201, ref. 006916). One species described, G. hippocampus, but Hassall also states: "in the same genus with this species should be placed the Navicula sigma, N. scalprum, and N. curvula of Ehrenberg. ICBN (1994) states that when Gyrosigma is considered a synonym of Pleurosigma, Pleurosigma is conserved against Gyrosigma.
Published in

Hassall, A.H. 1845  (ref. 469)

A history of the British Freshwater Algae (including descriptions of the Diatomaceae and Desmidiaceae) with upwards of one hundred Plates. I. Text.

Taylor, Walton, and Maberly, London. 462 pp.