semicell. Similar genera Micrasterias is generally easy to identify due to its shape and typically large size. The genus Pseudomicrasterias has been split off from the genus Micrasterias, and as of 2023, contains 2 species, formerly known as Micrasterias arcuata. They have a similar morphology to the simpler species of Micrasterias, but molecular phylogenetic analyses show that they are not related. The genus Prescottiella contains a single species, Prescottiella sudanensis, formerly known as Micrasterias sudanensis. It is distinguished from Micrasterias in that its semicells are not identical, making the cell asymmetrical along one axis; the spines of one semicell curve towards the isthmus, while the spines of the other semicell curve away. Species Accepted species Micrasterias comprises the following species: Micrasterias abrupta West & G.S.West Micrasterias adscendens Nordstedt Micrasterias africana (F.E.Fritsch & F.Rich) Coesel & Van Geest Micrasterias alata Wallich Micrasterias ambadiensis (Grönblad & A.M.Scott) Kurt Föster Micrasterias americana Ehrenberg ex Ralfs Micrasterias anomala W.B.Turner Micrasterias apiculata Meneghini ex Ralfs Micrasterias archeri Coesel & M.Dingley Micrasterias bangladeshensis A.K.Islam & Haroon Micrasterias bewsii Fritsch & M.F.Rich Micrasterias bicoronata A.Kenins Micrasterias borgei Willi Krieger Micrasterias bourrellyana J.A.Rino Micrasterias brachyptera Lundell Micrasterias ceratofera Joshua Micrasterias compereana Neustupa, St'astný & Skaloud Micrasterias conferta Lundell Micrasterias croasdaleana C.E.M.Bicudo & L.Sormus Micrasterias crux-africana F.J.Cohn Micrasterias crux-melitensis Ralfs Micrasterias cunningtonii G.S.West Micrasterias decemdentata (Nägeli) W.Archer Micrasterias denboeri Coesel & Van Geest Micrasterias denticulata Brébisson ex Ralfs Micrasterias depauperata Nordstedt Micrasterias dickiei (Ralfs) Škaloud et al. Micrasterias divisa Willi Krieger Micrasterias echinata P.E.Brandham Micrasterias elegans (W.West & G.S.West) Coesel & Van Geest Micrasterias elongata (Schmidle) Coesel & Van Geest Micrasterias euastriellopsis Bharati Micrasterias excavata (Nordstedt) C.E.M.Bicudo & L.Sormus Micrasterias fimbriata Ralfs Micrasterias foersteri Thomasson Micrasterias foliacea Bailey ex Ralfs Micrasterias furcata C.Agardh ex Ralfs Micrasterias groenewaldii Claassen Micrasterias hardyi G.S.West Micrasterias hieronymusii Schmidle Micrasterias horrida C.E.Taft Micrasterias incisa Ralfs Micrasterias inflata C.Bernard Micrasterias integra Nordstedt Micrasterias jejuensis H.S.Kim Micrasterias jenneri Ralfs Micrasterias johnsonii West & G.S.West Micrasterias khasiae W.B.Turner Micrasterias koreana H.S.Kim Micrasterias laticeps Nordstedt Micrasterias lebrunii Oye Micrasterias ledouxii A.M.Scott & Croasdale Micrasterias lundii Bourrelly Micrasterias lux Joshua Micrasterias madagascariensis Coesel Micrasterias mahabuleshwarensis J.Hobson Micrasterias moebii (O.Borge) West & G.S.West Micrasterias muricata Bailey ex Ralfs Micrasterias nordstedtiana Wolle Micrasterias nordstedtii Thomasson Micrasterias nylstromica Claassen Micrasterias oscitans Ralfs Micrasterias papillifera Brébisson ex Ralfs Micrasterias pinnatifida Ralfs Micrasterias piquata R.K.Salisbury Micrasterias prescottiana C.E.M.Bicudo & L.Sormus Micrasterias pseudotorreyi Wolle Micrasterias quadridentata (Nordstedt) Grönblad Micrasterias quadriverrucosa (Thomasson) C.E.M.Bicudo & L.Sormus Micrasterias