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.

Classification:
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 

References
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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