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Scientific classification e
Kingdom: Animalia
Phylum: Rotifera
Class: Seisonidea
Order: Seisonida
Family: Seisonidae
Wesenberg-Lund, 1899

See text.

Seisonidae is a family of rotifers, found on the gills of Nebalia, a marine crustacean. Peculiar among rotifers, males and females are both present and equal in size. It is considered to have diverged from the other rotifers early on, and in one treatment is placed in a separate class Seisonoidea.[1] They have a large and elongate body with reduced corona.[2]


Two genera with total three species belong to Seisonidae:[3]


  1. ^ Ruppert, Edward E.; Fox, Richard S, & Barnes, Robert D. (2004), Invertebrate zoology : a functional evolutionary approach (7th ed.), Belmont, CA: Thomson-Brooks/Cole, ISBN 978-0-03-025982-1 , p. 98
  2. ^ Harley, Stephen A. Miller, John P. (2002). Zoology 5th edition (5th ed.). Boston [etc.]: McGraw-Hill. p. 160. ISBN 978-0070294110. 
  3. ^ a b c d Sorensen, M. V., H. Segers & P. Funch (2005). On a new Seison Grube, 1861 from coastal waters of Kenya, with a reappraisal of the classification of the Seisonida (Rotifera). Zoological Studies 44 (1): 34–43. Fulltext