Seisonidae

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. Males and females are similar with paired gonads. 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] Their muscular system is similar to that of other rotifers: They have longitudinal muscles as well as open annular muscles.

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

See text.

Species

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

  • Paraseison Plate, 1887
    • Paraseison annulatus (Claus, 1876) — ectoparasite of Nebalia[3]
  • Seison Grube, 1861
    • Seison nebaliae Grube, 1861 – commensal of Nebalia[3]
    • Seison africanus Sorensen, Segers & Funch, 2005 — host is unknown.[3]

References
  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. 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


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