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From the New Latin hypoptila.


hypoptilum (plural hypoptila)

  1. (ornithology, rare) An aftershaft.
    • 1924 October 30, W. DeW. Miller, “Variations in the structure of the aftershaft and their taxonomic value”, in American Museum Novitates, number 140:
      This secondary feather is known as the aftershaft or hypoptilum, and its presence or absence constitutes the most important structural difference in the feathers of existing birds.
    • 2016, Michael Heads, Biogeography and Evolution in New Zealand:
      The feathers in some ratites are unusual as they are less reduced than is the norm in birds—each feather has, in addition to the main feather, a large “after-shaft” or hypoptilum.