149,170 species and infraspecific names are in the database, 20,329 images, 57,397 bibliographic items, 375,012 distributional records.

Pleurosigma W.Smith, 1852, nom. et typ. cons.

Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Bacillariophyceae
Subclass Bacillariophycidae
Order Naviculales
Suborder Naviculineae
Family Pleurosigmataceae

Holotype species: Pleurosigma angulatum (J.T.Quekett) W.Smith

Original publication and holotype designation: Smith, W. (1852). Notes on the Diatomaceae with descriptions of British species included in the genus Pleurosigma. Annals and Magazine of Natural History, series 2 9: 1-12, 2pl.
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Taxonomic status: currently recognized as a distinct genus.

Gender: This genus name is currently treated as neuter.

Most recent taxonomic treatment adopted: Cox, E.J. (2015). Coscinodiscophyceae, Mediophyceae, Fragilariophyceae, Bacillariophyceae (Diatoms). In: Sylabus of plant families. Adolf Engler's Syllabus der Pflanzenfamilien. 13th Ed. Photoautotrophic eukaryotic algae Glaucocystophyta, Cryptophyta, Dinophyta/Dinozoa, Heterokontophyta/Ochrophyta, Chlorarachniophyta/Cercozoa, Euglenophyta/Euglenozoa, Chlorophyta, Streptophyta p.p. (Frey, W. Eds), pp. 64-103. Stuttgart: Borntraeger Science Publishers.

Comments: Round, Crawford & Mann (1990: 128) record this family as being a member of the Suborder Naviculineae. Scott & Thomas (2005: 158) record this genus as being a member of the Family Naviculaceae.

NCBI Nucleotide Sequences

Numbers of names and species: There are 273 species (and infraspecific) names in the database at present, of which 98 have been flagged as currently accepted taxonomically.

Names: ('C' indicates a name that is currently accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Pleurosigma acuminatum (Kützing) Grunow S 
Pleurosigma acuminatum var. brebissonii (Grunow) Mills P 
Pleurosigma acuminatum (Kützing) W.Smith S 
Pleurosigma acus A.Mann C 
Pleurosigma acutum Norman ex Ralfs C 
Pleurosigma acutum var. latum T.G.Chin & S.Liu C 
Pleurosigma aequatoriale Cleve S 
Pleurosigma aestuarii (Brébisson ex Kützing) W.Smith C 
Pleurosigma aestuarii var. minutum Grunow S 
Pleurosigma aestuarii var. candidum (Schumann) H.Peragallo S 
Pleurosigma affine Grunow S 
Pleurosigma affine var. fossile Grunow S 
Pleurosigma amarum S.R.Stidolph C 
Pleurosigma amarum S.R.Stidolph C 
Pleurosigma ambrosianum Sterrenburg, M.A.Tiffany & C.B.Lange C 
Pleurosigma americanum H.Peragallo C 
Pleurosigma angulatum var. quadratum (W.Smith) Van Heurck C 
Pleurosigma angulatum var. finmarchicum (Grunow) Cleve S 
Pleurosigma angulatum var. strigosum (W.Smith) Van Heurck S 
Pleurosigma angulatum var. robustum McCall C 
Pleurosigma angulatum (J.T.Quekett) W.Smith C - type
Pleurosigma angulatum f. major Van Heurck P 
Pleurosigma angulatum var. elongatum (W.Smith) van Heurck S 
Pleurosigma angulatum var. aestuarii (Brébisson) van Heurck S 
Pleurosigma angulatum f. salinarum (Grunow) De Toni S 
Pleurosigma angulatum var. delicatulum (W.Smith) van Heurck S 
Pleurosigma angulatum var. falcatum T.G.Chin & S.Liu C 
Pleurosigma angulatum var. minutum (Grunow) McCall P 
Pleurosigma angulatum var. undulatum Grunow C 
Pleurosigma angulatum f. minutum (Grunow) De Toni S 
Pleurosigma angulatum var. genuinum Cleve-Euler S 
Pleurosigma angusti-convexum Hagelstein C 
Pleurosigma angustum Donkin S 
Pleurosigma antarcticum Grunow C 
Pleurosigma arcticum (Cleve) A.Mann U 
Pleurosigma arcuatum Donkin S 
Pleurosigma asiaticum (Tempère & Brun) H.Peragallo S 
Pleurosigma atlanticum Frenguelli P 
Pleurosigma attentuatum (Kützing) W.Smith S 
Pleurosigma attenuatum (Kützing) W.Smith S 
Pleurosigma attenuatum var. scalprum (Gaillon) Cleve S 
Pleurosigma attenuatum var. hippocampus (Ehrenberg; W.Smith) H.Peragallo S 
Pleurosigma australe Grunow C 
Pleurosigma australicum Witt S 
Pleurosigma balticum var. diminutum Grunow C 
Pleurosigma balticum (Ehrenberg) W.Smith S 
Pleurosigma balticum var. californicum Grunow S 
Pleurosigma balticum var. wansbeckii (Donkin) Van Heurck S 
Pleurosigma balticum var. californicum Grunow S 
Pleurosigma balticum var. obliquum (Grunow) H.Peragallo S 
Pleurosigma balticum var. lorenzii (Grunow) H.Peragallo U 
Pleurosigma barbadense Grunow C 
Pleurosigma boyeri Keeley S 
Pleurosigma brebissonii Grunow S 
Pleurosigma brunii Cleve ex H.Peragallo C 
Pleurosigma candidum Schumann U 
Pleurosigma capense Petit C 
Pleurosigma capense Karsten U 
Pleurosigma carinatum Donkin S 
Pleurosigma chandolensis H.P.Gandhi C 
Pleurosigma chilense Hustedt & Krasske C 
Pleurosigma chilense var. patagonicum M.E.Ferrario & E.A.Sar S 
Pleurosigma clevei var. manitounukensis M.Poulin & A.Cardinal C 
Pleurosigma clevei var. siberica Grunow C 
Pleurosigma clevei Grunow C 
Pleurosigma compactum Greville S 
Pleurosigma crassum Meister C 
Pleurosigma crookii Inglis C 
Pleurosigma curiosum van den Heuvel C 
Pleurosigma curvulum (Ehrenberg) Ralfs P 
Pleurosigma cuspidatum (Cleve) H.Peragallo C 
Pleurosigma cuspidatum Cleve C 
Pleurosigma cuspidatum var. rostratum Prosckina-Lavrenko P 
Pleurosigma decorum W.Smith C 
Pleurosigma decorum var. quebecense A.Cardinal, M.Poulin, & L.Bérard-Therriault P 
Pleurosigma delicatulum W.Smith C 
Pleurosigma delicatulum var. salinarum Grunow S 
Pleurosigma delicatulum var. gracile McCall C 
Pleurosigma delicatulum var. americanum Cleve C 
Pleurosigma densestriatum H.P.Gandhi C 
Pleurosigma depauperata Manguin in Bourrelly & Manguin P 
Pleurosigma diminutum Grunow C 
Pleurosigma diminutum var. constrictum Grunow U 
Pleurosigma directum Grunow C 
Pleurosigma distinguendum Hustedt C 
Pleurosigma distortum var. diaphanum (Cleve) H.Peragallo & M.Peragallo S 
Pleurosigma distortum var. undulatum McCAll U 
Pleurosigma distortum W.Smith S 
Pleurosigma diversestriatum F.Meister C 
Pleurosigma elongatum W.Smith C 
Pleurosigma elongatum var. grossepunctatum J.John C 
Pleurosigma elongatum var. sinicum Skvortzow [Skvortzov] C 
Pleurosigma elongatum var. fallax (Grunow) Cleve C 
Pleurosigma eudon var. kerguelense Heiden P 
Pleurosigma exemptum A.Mann C 
Pleurosigma eximium (Thwaites) Grunow S 
Pleurosigma exsul Cleve C 
Pleurosigma falcatum Donkin S 
Pleurosigma fallax Grunow S 
Pleurosigma falx A.Mann C 
Pleurosigma fasciola (Ehrenberg) W.Smith S 
Pleurosigma fasciola var. macrum (W.Smith) H.Peragallo S 
Pleurosigma fasciola var. sulcatum Grunow C 
Pleurosigma fasciola var. prolongatum (W.Smith) Van Heurck S 
Pleurosigma fasciola var. closterioides (Grunow) Peragallo P 
Pleurosigma finmarchicum Grunow C 
Pleurosigma finmarchicum Cleve in Cleve & Möller P 
Pleurosigma fluviicygnorum J.John C 
Pleurosigma formosum W.Smith C 
Pleurosigma formosum var. balearica H.Peragallo C 
Pleurosigma formosum var. longissimum Grunow C 
Pleurosigma frenguellianum Sunesen, Sterrenburg & Sar C 
Pleurosigma galapagense Cleve C 
Pleurosigma giganteum Grunow S 
Pleurosigma gracile Hustedt C 
Pleurosigma gracilentum Rabenhorst S 
Pleurosigma gracilitatis Sterrenburg, Meave & Tiffany C 
Pleurosigma gracillimum Meister C 
Pleurosigma grovesii Cleve ex H.Peragallo S 
Pleurosigma gruendleri Grunow C 
Pleurosigma guarreranum E.A.Sar, F.A.S.Sterrenburg & I.Sunesen C 
Pleurosigma hamuliferum Brun C 
Pleurosigma hinzianum Sterrenburg, Sunesen & Sar C 
Pleurosigma hippocampus W.Smith S 
Pleurosigma ibericum Peragallo C 
Pleurosigma indicum Simonsen C 
Pleurosigma inflatum Shadbolt C 
Pleurosigma inscriptura M.A.Harper C 
Pleurosigma intermedium W.Smith C 
Pleurosigma intermedium var. nubecula (W.Smith) Grunow ex Van Heurck S 
Pleurosigma intermedium var. mauritiana (Grunow ex Cleve) M. Peragallo C 
Pleurosigma intermedium var. dongshanense T.G.Chin & S.Liu C 
Pleurosigma intermedium W.Smith C 
Pleurosigma italicum H.Peragallo C 
Pleurosigma japonicum Castracane S 
Pleurosigma kerguelense Grunow C 
Pleurosigma kjellmanii Cleve C 
Pleurosigma kuetzingii Grunow S 
Pleurosigma lacustre W.Smith S 
Pleurosigma lanceolatum var. cuspidatum Cleve S 
Pleurosigma lanceolatum Donkin C 
Pleurosigma lange-bertalotii B.Karthick & Kociolek C 
Pleurosigma latiusculum H.Peragallo P 
Pleurosigma latum Cleve C 
Pleurosigma lineare Grunow C 
Pleurosigma littorale W.Smith S 
Pleurosigma longinum W.Smith ex Brightwell C 
Pleurosigma longum Cleve C 
Pleurosigma longum var. subrigidum (Grunow H.Peragallo P 
Pleurosigma longum var. lanceolatum H. Peragallo & M. Peragallo C 
Pleurosigma lorenzii Grunow U 
Pleurosigma lysekilii G.Reid C 
Pleurosigma macilentum H.Peragallo C 
Pleurosigma macrum W.Smith S 
Pleurosigma maeoticum Pantocsek C 
Pleurosigma majus (Grunow) Cleve P 
Pleurosigma majus T.G.Chin & S.Liu U 
Pleurosigma malmoensis G.Reid C 
Pleurosigma mamoranqii G.Reid C 
Pleurosigma marinum Donkin C 
Pleurosigma mariutense G.Reid P 
Pleurosigma maroccanum (Cleve ex H.Peragallo) Cleve S 
Pleurosigma minutum Donkin S 
Pleurosigma naja Meister S 
Pleurosigma naviculaceum Brébisson S 
Pleurosigma naviculaceum f. minutum Cleve C 
Pleurosigma negoroi T.Gotoh C 
Pleurosigma nicobaricum Grunow C 
Pleurosigma nodiferum Grunow S 
Pleurosigma normanii var. fossile (Grunow) Cleve U 
Pleurosigma normanii Ralfs C 
Pleurosigma nubecula var. intermedium (W.Smith) Cleve S 
Pleurosigma nubecula W.Smith S 
Pleurosigma nubecula var. mauritiana Grunow ex Cleve S 
Pleurosigma obesum A.Mann S 
Pleurosigma obliquum Grunow S 
Pleurosigma obscurum W.Smith S 
Pleurosigma obtusatum W.S.Sullivant & Wormley S 
Pleurosigma obtusum A.Mann C 
Pleurosigma paradoxum H.Peragallo C 
Pleurosigma parkeri M.B.Harrison S 
Pleurosigma parkeri var. stauroneoides Grunow S 
Pleurosigma patagonicum (M.E.Ferrario & E.A.Sar) F.Sterrenburg & E.A.Sar C 
Pleurosigma peisone Grunow S 
Pleurosigma peisonis var. delicatula A.Amossé U 
Pleurosigma pelagicum Cleve C 
Pleurosigma permagnum Meister C 
Pleurosigma perthense J.John C 
Pleurosigma planctonicum R.Simonsen S 
Pleurosigma planctonicum H.-J.Schrader C 
Pleurosigma planctonicum A.Cleve C 
Pleurosigma portoricense Hagelstein C 
Pleurosigma praelongum Cleve C 
Pleurosigma prolongatum W.Smith S 
Pleurosigma prolongatum var. closterioides Grunow S 
Pleurosigma pulchrum Grunow C 
Pleurosigma pusillum var. salinarum (Grunow) H.Peragallo S 
Pleurosigma pusillum Grunow S 
Pleurosigma quadratum W.Smith S 
Pleurosigma quadratum var. rhombeum Grunow S 
Pleurosigma quininpiaceii M.Peragallo S 
Pleurosigma rahlehense G.Reid P 
Pleurosigma rectum Donkin S 
Pleurosigma reticulatum (Norma) Hustedt S 
Pleurosigma reversum Gregory S 
Pleurosigma rhombeum (Grunow) H.Peragallo C 
Pleurosigma rhomboides Cleve C 
Pleurosigma rigidum var. giganteum (Grunow Cleve P 
Pleurosigma rigidum W.Smith C 
Pleurosigma rigidum var. incurvatum Brun C 
Pleurosigma rigidum var. genuinum Cleve-Euler S 
Pleurosigma robustum Grunow S 
Pleurosigma rostratum Hustedt C 
Pleurosigma rushdyense G.Reid P 
Pleurosigma sabangi Meister P 
Pleurosigma salinarum (Grunow) Grunow C 
Pleurosigma salinarum var. pusilla (Grunow) Cleve S 
Pleurosigma salinarum var. boyeri (Keeley) Reimer C 
Pleurosigma scalpellum Pritchard P 
Pleurosigma scalproides Rabenhorst S 
Pleurosigma scalproides var. obliqua (Grunow) F.W.Mills S 
Pleurosigma scalprum (Gaillon) Ralfs S 
Pleurosigma scalprum var. gallicum Grunow S 
Pleurosigma sciotoense W.S.Sullivant S 
Pleurosigma siberica (Grunow) A.Cardinal, M.Poulin & L.Bérard-Therriault P 
Pleurosigma siberica var. manitounukensis (M.Poulin & A.Cardinal) A.Cardinal, M.Poulin & L.Bérard-Therriault P 
Pleurosigma simile Grunow S 
Pleurosigma simonsenii Hasle C 
Pleurosigma sinensis (Ehrenberg) Ralfs S 
Pleurosira socotrensis var. pangeronii (Leuduger-Fortmorel) Compère C 
Pleurosigma speciosum W.Smith C 
Pleurosigma speciosum var. majus Grunow S 
Pleurosigma spectabile Grunow S 
Pleurosigma spenceri (Bailey ex Quekett) W.Smith S 
Pleurosigma spenceri var. exilis Grunow S 
Pleurosigma spenceri var. subsalina H.Peragallo C 
Pleurosigma spenceri Grunow C 
Pleurosigma spenceri var. nodiferum (Grunow) van Heurck S 
Pleurosigma spenceri var. kuetzingii (Grunow) Grunow S 
Pleurosigma spenceri var. curvula Grunow S 
Pleurosigma spenceri var. smithii Grunow C 
Pleurosigma spenceri var. splendidum Van Heurck U 
Pleurosigma spencerii var. minor Grunow U 
Pleurosigma spinulosum Pantocsek & Greguss P 
Pleurosigma staurophorum Grunow S 
Pleurosigma sterrenburgii Stidolph C 
Pleurosigma stidolphii F.A.S.Sterrenburg C 
Pleurosigma strigilis W.Smith S 
Pleurosigma strigosum W.Smith C 
Pleurosigma strigosum var. genuinum Cleve-Euler S 
Pleurosigma stuxbergii Cleve & Grunow C 
Pleurosigma stuxbergii var. rhomboides (Cleve ) H.Peragallo P 
Pleurosigma subhyalinum Hustedt & Aleem C 
Pleurosigma subrectum Cleve C 
Pleurosigma subrigidum Grunow C 
Pleurosigma subsalinum H.Peragallo U 
Pleurosigma subsalsum Wislouch & Kolbe C 
Pleurosigma subtilissimum T.Marsson C 
Pleurosigma sulcatum Grunow S 
Pleurosigma tahitianum Ricard C 
Pleurosigma tahitiense Witt S 
Pleurosigma temperei (Cleve) M.Peragallo S 
Pleurosigma tenuiforme C.H.von Quillfeldt C 
Pleurosigma tenuissimum W.Smith S 
Pleurosigma terryanum H.Peragallo S 
Pleurosigma transversale W.Smith S 
Pleurosigma transversale var. beta Roper C 
Pleurosigma transversale Roper S 
Pleurosigma validum Shadbolt S 
Pleurosigma vitreum Cleve S 
Pleurosigma wansbeckii Donkin S 
Pleurosigma williamsii G.Reid P 
Pleurosigma wormleyi W.S.Sullivant S 

Hustedt, F. (1930). Bacillariophyta (Diatomeae) Zweite Auflage. In: Die Süsswasser-Flora Mitteleuropas. Heft 10. (Pascher, A. Eds), pp. [i]-vii, [1]-466. Jena: Verlag von Gustav Fischer.

Kociolek, J.P. & Spaulding, S.A. (2003). Symmetrical Naviculoid Diatoms. In: Freshwater Algae of North America, Ecology and Classification. (Wehr, J.D. & Sheath, R.G. Eds), pp. 637-654. San Diego: Academic Press.

Round, F.E., Crawford, R.M. & Mann, D.G. (1990). The Diatoms: Biology and morphology of the genera. pp. i-xi, 1-747. Cambridge: Cambridge University Press.

Scott, F.J. & Thomas, D.P. (2005). Diatoms. In: Antarctic marine protists. (Scott, F.J. & Marchant, H.J. Eds), pp. 13-201. Canberra & Hobart: Australian Biological Resources Study; Australian Antarctic Division.

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Created: 11 April 2002 by M.D. Guiry

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