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Catalogue of Diatom Names, On-Line Version, Updated 19 Sep 2011
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Isthmia C.A. Agardh 1832, pg. 55
Generitype LT: Isthmia obliquata (J.E. Smith ) C.A. Agardh 1832 (=Conferva obliquata J.E. Smith 1808)
Designated by Type designated by Boyer 1927, p. 140 (ref. 000155).
Year Designated 1927
Nomenclatural status valid
Recent revisions
Comments Two species are described in Agardh 1832, Isthmia obliquata, Isthmia vesiculosa, and no type is designated. Farr et al. (1979) indicate that Kützing 1833 (ref. 000594), p. 579, 610, designated I. obliquata as the lectotype. Kützing 1833 treated Isthmia vesiculosa as a Biddulphia (p. 610, p. 82 in other reprint), retaining, of the original species, only I. oblicata in genus Isthmia (p. 579, p. 51 in other reprint). Kützing's action does not by itself constitute lectotypification of the genus. Boyer 1927 (ref. 000155), p. 140 gives I. obliquata as the type.
Published in

Agardh, C.A. 1832  (ref. 940)

Conspectus Criticus Diatomacearum. Part 4.

Lundae. Litteris Berlingianis pp. 48-66