Species Details

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Cocconeis placentula, Ehrenberg, 1838
  • Cocconeis pediculus var. placentula : Ehrenberg, Grunow (1867)
  • Cocconeis communis var. placentula : Ehrenberg, Kirchner (1878)
  • Cocconeis communis f. placentula : Ehrenberg, Chmielevski (1885)
Morphological Characteristics

Solitary. In valve view the frustule is oval, elliptical or discoid. The valves differ, the upper one having a straight narrow raphe and thin radial striae, while the lower valve has a central, narrow straight pseudo-raphe.


Morphological Data
Distinctive morphometric characters
  • Cell Length: from 7.5 to 98 µm
  • Cell Width: from 8 to 40 µm
  • Striae in 10 µm: from 23 to 25 n°


Typical of marine and freshwater environments.

Distribution: Europe: Denmark (Ettl & Gärtner, 1995), Finland (Weckstrom & Juggins 2006), Germany (Ettl & Gärtner 1995), Iceland (Ettl & Gärtner 1995), Netherlands (Barranguet et al. 2005), Romania (Caraus 2002), Spain (Zafra & Aboal 2004), Turkey (Ersanli & Gönülol, 2006); in the Atlantic: Canary Islands (Gil-Rodríguez & Moreira-Reyes, 2005); North America: USA (Ettl & Gärtner 1995), in South-west Asia: Iran (Bagheri & Ramzannejad Ghadi, 2008), Turkey (Soylu & Gonulol 2006) China (Hu and Wei, 2006); Australia and New Zealand: South Australia (Leterme et al., 2010), Tasmania (Day et al., 1995); in the Pacific Ocean: Hawaiian Islands (Sherwood, 2004).



Not reported.

Resistence Stages:

Not reported.


The algae of Romania., Studii si Cercetari, Universitatea Bacau, Biologie 7, Caraus I., 2002, 1-694

Syllabus der Boden-, Luft- und Flechtenalgen., Stuttgart: Gustav Fischer, Ettl H., e Gärtner G., 1995, pp. i-vii,1-721

Coastal diatom-environment relationships from the Gulf of Finland, Baltic Sea ., Journal of Phycology 42:, Weckstrom K., Juggins S., 2006, 21-35.

Divergent composition of algal-bacterial biofilms developing under various external factors., European Journal of Phycology 40:, Barranguet C., Veuger B., Van Beusekom S.A.M., Marvan P., Sinke J.J., Admiraal W., 2005, 1-8.

Seasonal variation in the diversity, species richness and composition of the phytoplankton assemblages in a shallow lake., Cryptogamie, Algologie 27:, Soylu E.N., e Gönülol A., 2006, 85-101.

Epiphytic Algae of Miankaleh International Wetland ( North of Iran)., , Bagheri L., Ramzannejad Ghadi R., 2008,

Checklist of Baltic Sea Phytoplankton Species. Baltic Sea Environment Proceedings No. 95, Helsinki Commission Baltic Marine Environment Protection Commission, Hällfors G., 2004,

Süßwasserflora von Mitteleuropa, Bd. 02/4: Bacillariophyceae Teil 4: Achnanthaceae, Kritische Ergänzungen zu Navicula und Gomphonema, Gesamtliteraturverzeichnis Teil 1-4, Gustav Fisher Verlag: Stuttgard, Krammer K., Lange-Bertalot H., 1991,

Die Infusionsthierchen als vollkommene Organismen. Atlas., Leipzig: Verlag von Leopold Voss, Ehrenberg C.G., 1838, pp. i-xvii, 1-548, pls I-LXIV.

The freshwater algae of China. Systematics, taxonomy and ecology, China: www.sciencep.com., Hu H., Wei Y., 2006, 1-1023

Proctoctista. In: Lista de especies marinas de Canarias (algas, hongos, plantas y animales). (Moro, L., Martín, J.L., Garrido, M.J. & Izquierdo, I. Eds), Las Palmas: Consejería de Política Territorial y Medio Ambiente del Gobierno de Canarias., Gil-Rodríguez M.C., Haroun R., Ojeda Rodríguez A., Berecibar Zugasti E., Domínguez Santana P., Herrera Morán B., 2003, 5 - 30

A study on the phytoplankton of Lake Simenit, Turkey., Cryptogamie, Algologie 27:, Ersanli E., Gönülol A., 2006, 289-305, 28 figs.

Bibliographic checklist of the nonmarine algae of the Hawaiian Islands. Records of the Hawaii Biological Survey for 2003, Bishop Museum Occasional Papers 80, Sherwood A.R., 2004, 1-26

Shape Type
Shape Unit
8 - Prisma su base ellittica
Surface Area
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