Ciliate protozoan,SEM

Numéro d’image : 11905751
Ciliate protozoan,SEM
Ciliate protozoan. Coloured scanning electron micrograph (SEM) of a type of Stentor,a freshwater ciliate protozoan. These are the largest protozoans found in fresh water. Some species reach 2 millimetres in length. They have a trumpet-like opening (upper left) surrounded by a rim of cilia (not seen). The cilia beat to create a current of water that draws food inside,for example bacteria (purple). When sedentary,Stentor are usually long and slender,but when swimming they become more oval and the posterior becomes narrower as pictured here. Some Stentor are green in colour because they contain symbiotic green algae
Licence : Droits gérés
Crédit: Science Photo Library / Gschmeissner, Steve
Taille de l’image : 1923 px × 2400 px
Model Release : Non requis
Property Release : Non requis
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