parasitic male

noun

1. zoology a male animal that is much smaller than the female and is totally dependent on the female for its nutrition, such as the male of some species of deep-sea angler fish

Example Sentences

But it's unclear which fish—the female or the parasitic male—controls the sperm release.

From National Geographic

From the peculiar form of their prehensile antenn�, differing in no respect, except in the proportional lengths of the segments, from the same organ in the male I. Cumingii, I can feel no doubt that these were the larv� of the male I. quadrivalvis;—for a moment's reflection will show how excessively improbable it is, that several larv� of some other Cirripede, and that a Cirripede intimately allied to the parasitic male Ibla, should have forced themselves, without any apparent object, into the sack of the hermaphrodite Ibla.

From Project Gutenberg