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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 671

J. Green; Asymmetry and variation Keratella tropica. Hydrobiologia 73:241-248, 1980

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Keratella tropica usually has two posterior spines. Both may vary in length, but the left is always shorter than the right. Sometimes the left spine is absent. Spine length varies with the length of the lorica, but there are other, external influences. Three separate lines of evidence indicate that factors which promote spine length are related in some way to the presence of calanoid copepods.