polybranchia definition

  • noun-plural:
    • A division of Nudibranchiata including those which have numerous branchiæ on the back.
  • others:
    • In J. E. Gray's category (1821), 1 of 2 sales (others being Pygobranchia) of nudibranchiate gastropods, having lamellar or plumose gills regarding the upper area regarding the mantle, and containing the people Tritoniadæ, Scyllsæidæ, and Tethyadæ.
    • In latersystems, a suborder or superfamily comprising exactly the same forms, but subdivided among numerous households: same as Polybranchiata, 1.
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