Chaetoceros is probably the largest genus of marine planktonic diatoms with approximately 400 species described. Although a large number of these descriptions are no longer valid. It is often very difficult to distinguish between different Chaetoceros species. Several attempts have been made to restructure this large genus into subgenera and this work is still in progress However, most of the effort to describe species have been focused in boreal areas, and the genus is cosmopolitan, so there are probably a large number of tropical species still undescribed.

Description

The genus Chaetoceros were first described by Ehrenberg in 1844.

Cells are more or less rectangular in girdle view.

Cells are usually elliptical in valve view.

Opposite setae of adjacent cells touch near their origin.

Some currently accepted Chaetoceros species

• Chaetoceros abnormis A.I. Proshkina-Lavrenko
• Chaetoceros aculeatus I.V. Makarova
• Chaetoceros adelianus E.E. Manguin
• Chaetoceros aduncus I.N. Sukhanova
• Chaetoceros aequatorialis var. antarcticus Manguin
• Chaetoceros aequatorialis Cleve
• Chaetoceros affinis f. pseudosymmetricus (E. Steemann Nielsen) M. Torrington-Smith
• Chaetoceros affinis f. parallelus M. Thorrington-Smith
• Chaetoceros affinis f. inaequalis M. Thorrington-Smith
• Chaetoceros affinis Lauder
• Chaetoceros amanita A. Cleve-Euler
• Chaetoceros anastomosans Grunow
• Chaetoceros angularis Schütt
• Chaetoceros angulatus F. Schütt
• Chaetoceros anostomosans var. speciosus F. Schütt
• Chaetoceros armatus T. West
• Chaetoceros astrabadicus A. Henckel
• Chaetoceros atlanticus var. compactus (F. Schütt) P.T. Cleve
• Chaetoceros atlanticus var. neapolitanus (Schroeder) Hustedt
• Chaetoceros atlanticus var. tumescens A. Grunow
• Chaetoceros atlanticus Cleve
• Chaetoceros atlanticus f. audax (F. Schütt) H.H. Gran
• Chaetoceros atlanticus var. cruciatus (G. Karsten) M. Thorrington-Smith
• Chaetoceros audax F. Schütt
• Chaetoceros bacteriastrius G.C. Wallich
• Chaetoceros bacteriastroides f. imbricatus (L.A. Mangin) M. Thorrington-Smith
• Chaetoceros bacteriastroides G.H.H. Karsten
• Chaetoceros bermejense D. U. Hernández-Becerril
• Chaetoceros bisetaceus J. Schumann
• Chaetoceros borealis J.W. Bailey
• Chaetoceros borealoides H.L. Honigmann
• Chaetoceros breve F. Schütt
• Chaetoceros brevis Schütt
• Chaetoceros brussilowi A. Henckel
• Chaetoceros buceros G.H.H. Karsten
• Chaetoceros buceros Karsten
• Chaetoceros bulbosus (Ehrenberg) Heiden
• Chaetoceros bulbosus f. cruciatus (G. Karsten) H. Heiden
• Chaetoceros bulbosus f. schimperana (G. Karsten) H. Heiden
• Chaetoceros bungei Honigmann
• Chaetoceros calcitrans f. pumilus Takano
• Chaetoceros californicus A. Grunow
• Chaetoceros capense G.H.H. Karsten
• Chaetoceros caspicus C.E.H. Ostenfeld
• Chaetoceros caspicus var. karianus A. Henckel
• Chaetoceros caspicus f. pinguichaetus A. Henckel & P. Henckel
• Chaetoceros castracanei Karsten
• Chaetoceros castracanei G.H.H. Karsten
• Chaetoceros ceratospermus var. minor A.F. Meunier
• Chaetoceros ceratosporus var. brachysetus Rines & Hargraves
• Chaetoceros ceratosporus Ostenfeld
• Chaetoceros chunii G.H.H. Karsten
• Chaetoceros cinctus Gran
• Chaetoceros clavigera C.E.H. Ostenfeld
• Chaetoceros clavigerus A. Grunow
• Chaetoceros clevei F. Schütt
• Chaetoceros coarctatus Lauder
• Chaetoceros cochleus F. Schütt
• Chaetoceros compactus F. Schütt
• Chaetoceros compressus var. gracilis F. Hustedt
• Chaetoceros compressus var. hirtisetus J.E.B. Rines & P.E. Hargraves
• Chaetoceros concavicorne Mangin
• Chaetoceros confervoides J. Ralfs
  John Ralfs
  John Ralfs was an English botanist. Born in Millbrook, near Southampton, he was the second son of Samuel Ralfs, a yeoman of an old family in Hampshire...
  
  
• Chaetoceros confusus S.L. VanLandingham
• Chaetoceros constrictus Gran
• Chaetoceros convolutus Castracane
• Chaetoceros convolutus f. trisetosus Brunel
• Chaetoceros convolutus f. volans L.I. Smirnova
• Chaetoceros cornutus G. Leuduger-Fortmorel
• Chaetoceros coronatus Gran
• Chaetoceros costatus Pavillard
• Chaetoceros crenatus (C.G. Ehrenberg) T. Brightwell
• Chaetoceros crinitus Schütt
• Chaetoceros criophilus Castracane
• Chaetoceros cruciatus G.H.H. Karsten
• Chaetoceros curvatus Castracane
• Chaetoceros curvisetus Cleve
• Chaetoceros dadayi Pavillard
• Chaetoceros danicus Cleve
• Chaetoceros debilis Cleve
• Chaetoceros decipiens f. singularis H.H. Gran
• Chaetoceros decipiens Cleve
• Chaetoceros delicatulus C.E.H. Ostenfeld
• Chaetoceros densus Cleve
• Chaetoceros diadema
  Chaetoceros diadema
  Chaetoceros diadema is a diatom in the genus Chaetoceros. The easiest way to identify this species is by finding the very characteristic diadem-like resting spores.-Species description:...
  
   (Ehrenberg) Gran
• Chaetoceros dichaeta f. unicellularis H. Heiden
• Chaetoceros dichaetus Ehrenberg
• Chaetoceros dichaetus var. polygonus (F. Schütt) H. Heiden
• Chaetoceros didymus var. praelongus E.J. Lemmermann
• Chaetoceros didymus f. aestivus H.H. Gran
• Chaetoceros didymus f. autumnalis H.H. Gran
• Chaetoceros didymus C.G. Ehrenberg
• Chaetoceros difficilis Cleve
• Chaetoceros distichus F. Schütt
• Chaetoceros distinguendus E.J. Lemmermann
• Chaetoceros diversicurvatus Van Goor
• Chaetoceros diversus var. mediterraneus J.L.B. Schröder
• Chaetoceros diversus Cleve
• Chaetoceros eibenii (Grunow) Meunier
• Chaetoceros elmorei Boyer
• Chaetoceros elongatus Honigmann
• Chaetoceros exospermus Meunier
• Chaetoceros externus Gran
• Chaetoceros fallax Prosckina-Lavrenko
• Chaetoceros femur F. Schütt
• Chaetoceros filiferus G.H.H. Karsten
• Chaetoceros filiforme Meunier
• Chaetoceros flexuosus Mangin
• Chaetoceros fragilis Meunier
• Chaetoceros furca var. macroceras J.L.B. Schröder
• Chaetoceros furcellatus
  Chaetoceros furcellatus
  Chaetoceros furcellatus is an Arctic neritic diatom in the genus Chaetoceros. The easiest way to identify this species is by finding the very characteristic resting spores. C. furcellatus is a common and important species in the Barents sea....
  
   J.W. Bailey
• Chaetoceros fusus F. Schütt
• Chaetoceros galvestonense Collier & Murphy
• Chaetoceros gastridius (C.G. Ehrenberg) T. Brightwell
• Chaetoceros gaussii Heiden & Kolbe
• Chaetoceros glacialis A. Henckel
• Chaetoceros glandazii Mangin
• Chaetoceros gobii A. Henckel
• Chaetoceros gracilis Pantocsek
• Chaetoceros grunowii F. Schütt
• Chaetoceros hendeyi Manguin
• Chaetoceros hispidus var. monicae A. Grunow
• Chaetoceros hohnii Graebn. & Wujek
• Chaetoceros holsaticus Schütt
• Chaetoceros ikari B.V. Skvortzov
• Chaetoceros imbricatus Mangin
• Chaetoceros incurvus var. umbonatus Castracane
• Chaetoceros incurvus Bailey
• Chaetoceros indicus Karsten
• Chaetoceros ingolfianus Ostenfeld
• Chaetoceros intermedius A. Henckel
• Chaetoceros karianus Grunow
• Chaetoceros karyanus A. Henckel
• Chaetoceros knipowitschii A. Henckel
• Chaetoceros laciniosus Schüt
• Chaetoceros laciniosus f. protuberans M. Thorrington-Smith
• Chaetoceros laciniosus f. pelagicus H.H. Gran
• Chaetoceros lauderi Ralfs
  John Ralfs
  John Ralfs was an English botanist. Born in Millbrook, near Southampton, he was the second son of Samuel Ralfs, a yeoman of an old family in Hampshire...
  
  
• Chaetoceros leve F. Schütt
• Chaetoceros littorale litorale E.J. Lemmermann
• Chaetoceros lorenzianus var. forceps A.F. Meunier
• Chaetoceros lorenzianus Grunow
• Chaetoceros malygini A. Henckel
• Chaetoceros medius F. Schütt C
• Chaetoceros meridiana (F. Schütt) G. Karsten
• Chaetoceros mertensii H.L. Honigmann
• Chaetoceros messanense Castracane C
• Chaetoceros minimus (Levander) D. Marino, G. Giuffre, M. Montresor & A. Zingone
• Chaetoceros misumensis H.H. Gran & K. Yendo
• Chaetoceros mitra (J.W. Bailey) Cleve
• Chaetoceros muelleri var. duplex E.J. Lemmermann
• Chaetoceros muelleri var. subsalsum J.R. Johansen & S. Rushforth
• Chaetoceros muelleri E.J. Lemmermann
• Chaetoceros muellerii var. subsalsus J.R. Johansen & Rushforth
• Chaetoceros nansenii A. Henckel
• Chaetoceros natatus E.E. Manguin
• Chaetoceros neglectus Karsten
• Chaetoceros neobulbosus T.V. Desikachary, S. Gowthaman & Y. Latha
• Chaetoceros neocompactus S.L. VanLandingham
• Chaetoceros neogracile S.L. VanLandingham
• Chaetoceros neupokojewii A. Henckel
• Chaetoceros nipponicus J. Ikari
• Chaetoceros odontella (C.G. Ehrenberg) G.L. Rabenhorst
• Chaetoceros okamurae var. tetrasetus J. Ikari
• Chaetoceros okamurae J. Ikari
• Chaetoceros ostenfeldii P.T. Cleve
• Chaetoceros pachtussowii A. Henckel
• Chaetoceros pachyceros R. Margalef
• Chaetoceros pacificus J. Ikari
• Chaetoceros paradoxus Cleve
• Chaetoceros paradoxus var. luedersii Engler
• Chaetoceros parvus F. Schütt
• Chaetoceros paulsenii f. robustus A. Henckel
• Chaetoceros pavillardii J. Ikari
• Chaetoceros pelagicus
• Chaetoceros pendulus Karsten
• Chaetoceros perpusillus Cleve
• Chaetoceros peruvianus var. victoriae Karsten
• Chaetoceros peruvianus var. gracilis J.L.B. Schröder
• Chaetoceros peruvianus Brightwell
• Chaetoceros peruvianus var. robustum P.T. Cleve
• Chaetoceros peruvianus var. suadivae Karsten
• Chaetoceros peruvianus f. volans (F. Schütt) C.E.H. Ostenfeld
• Chaetoceros peruvianus f. robustus (P.T. Cleve) C.E.H. Ostenfeld
• Chaetoceros phuketensis J.E.B. Rines, P. Boonruang & E.C. Theriot
• Chaetoceros pingue A. Henckel
• Chaetoceros pinguichaetus A. Henckel & P. Henckel
• Chaetoceros pliocenus J.-J. Brun
• Chaetoceros protuberans H.S. Lauder
• Chaetoceros pseudoaurivillii J. Ikari
• Chaetoceros pseudocrinitus Ostenfeld
• Chaetoceros pseudocurvisetus
  Chaetoceros pseudocurvisetus
  Chaetoceros pseudocurvisetus is a marine diatom in the genus Chaetoceros. It is an important primary producer in the oceans. C. pseudocurvisetus forms resting spores and resting cells, particularly in the absence of essential nutrients.-Habitat:...
  
   Mangin
• Chaetoceros pseudodichaeta J. Ikari
• Chaetoceros pundulus G.H.H. Karsten
• Chaetoceros radians F. Schütt
• Chaetoceros radicans F. Schütt
• Chaetoceros recurvatus f. robustus Henckel
• Chaetoceros recurvatus Henckel
• Chaetoceros robustus (P.T. Cleve) C.E.H. Ostenfeld
• Chaetoceros rostratus Lauder
• Chaetoceros russanowi A. Henckel
• Chaetoceros salsugineus Takano
• Chaetoceros saltans P.T. Cleve
• Chaetoceros schmidtii C.E.H. Ostenfeld
• Chaetoceros schuettii f. oceanicus H.H. Gran
• Chaetoceros secundus P.T. Cleve
• Chaetoceros seiracanthus Gran
• Chaetoceros sessile Grøntved
• Chaetoceros setoense J. Ikari
• Chaetoceros seychellarus G.H.H. Karsten
• Chaetoceros seychellarus var. austral E.E. Manguin
• Chaetoceros siamense C.E.H. Ostenfeld
• Chaetoceros similis Cleve
• Chaetoceros simplex C.E.H. Ostenfeld C
• Chaetoceros skeleton F. Schütt
• Chaetoceros socialis f. radians (F. Schütt) A.I. Proshkina-Lavrenko
• Chaetoceros socialis Lauder
• Chaetoceros socialis var. autumnalis Prosckina-Lavrenko
• Chaetoceros sedowii A. Henckel
• Chaetoceros strictus G.H.H. Karsten
• Chaetoceros subcompressus J.L.B. Schröder
• Chaetoceros subsalsus Lemmermann
• Chaetoceros subsecundus (Grunow ex Van Heurck) Hustedt
• Chaetoceros subtilis Cleve
• Chaetoceros sumatranus Karsten
• Chaetoceros tenuissimus A.F. Meunier
• Chaetoceros teres f. spinulosus H.H. Gran
• Chaetoceros teres Cleve
• Chaetoceros tetrachaeta Ehrenberg
• Chaetoceros tetras G.H.H. Karsten
• Chaetoceros tetrastichon Cleve
• Chaetoceros thienemannii  Hustedt
• Chaetoceros throndsenii var. trisetosus Zingone
• Chaetoceros throndsenii var. throndsenia D. Marino, M. Montresor & A. Zingone
• Chaetoceros throndsenii (Marino, Montresor, & Zingone) Marino, Montresor & Zingone
• Chaetoceros tortissimus H.H. Gran
• Chaetoceros transisetus J.R. Johansen & J.S. Boyer
• Chaetoceros vanheurckii H.H. Gran
• Chaetoceros vermiculus F. Schütt
• Chaetoceros villosus Kützing
• Chaetoceros vistulae C. Apstein
• Chaetoceros volans F. Schütt
• Chaetoceros weissflogii F. Schütt
• Chaetoceros wighamii Brightwell
• Chaetoceros willei Grunow
• Chaetoceros zachariasi var. longus H.L. Honigmann
• Chaetoceros zachariasii var. variatus H.L. Honigmann
• Chaetoceros zachariasii var. latus H.L. Honigmann
• Chaetoceros zachariasii Honigmann
• Chaetoceros ziwolkii A. Henckel

External links

• Algaebase
• C.H. von Quillfeldt article
• Rines 2000 article
• Index Nominum Algarum
• Catalogue of Diatom Names, California Academy of Sciences