complemental

The quantity taken in with the deepest possible inspiration (complemental air) is about 100 cubic inches.
Voice Production in Singing and Speaking|Wesley Mills
Hence I have called these males Complemental Males, to show that they do not pair with a female, but with a bisexual individual.
A Monograph on the Sub-class Cirripedia (Volume 2 of 2)|Charles Darwin
Perhaps they were really mated, their pettinesses and selfishnesses peculiarly complemental.
We Can't Have Everything|Rupert Hughes
Complemental Male of Scalpellum vulgare, attached over the fold in the occludent margin of the scutum of the hermaphrodite.
A Monograph on the Sub-class Cirripedia (Volume 1 of 2)|Charles Darwin

Complemental Male of Scalpellum villosum, greatly magnified.
A Monograph on the Sub-class Cirripedia (Volume 1 of 2)|Charles Darwin

Origin of complemental