![Sample our Environment & Agriculture journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5934/TOC-Subject-Sample-2021-Environment-Agriculture.jpg"})
Abstract
Although Gyrosigma hippocampus (Ehrenb.) Hassall has been designated the typus generis of Gyrosigma (nomen conservandum), it is a synonym of G. attenuatum (Kütz.) Rabenh. and consequently an illegitimate name. The marine taxon “Pleurosigma hippocampus” W. Smith differs fundamentally from Gyrosigma attenuatum (Kütz.) Rabenh. and thus requires renaming: Gyrosigma euhippus (W. Smith) Sterrenburg & Ross. “Pleurosigma acuminatum” sensu W. Smith is not equivalent to Gyrosigma acuminatum (Kütz.) Rabenh., nor is it a variety of the latter or of G. attenuatum. It requires re-definition and renaming: Gyrosigma scalprum (Gaillon in Turpin) Sterrenburg. This survey of the known species in H. Peragallo's sub-group “Attenuati” is completed by studies on Gyrosigma littorale (W. Smith) Griffith & Henfrey and G. stidolphii n. sp. All species were referenced to the types. They are easily distinguished if reliable criteria (Sterrenburg 1991b) are used.