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In general, barnacles are simultaneous hermaphrodites (that is, each individual has both male and female reproductive systems). Although some species are known to self-fertilize if no partners are present, most shallow-water species cross-fertilize, by means of internal fertilization. In species in which populations are sparsely distributed, a hermaphrodite may be accompanied by one or more small “complemental” males, or the larger individual may develop into a female whereby a smaller individual attaching to it becomes a “dwarf” male. When the male occupies a fairly exposed position on its partner, it resembles the ... (100 of 4596 words)
Aspects of the topic cirripede are discussed in the following places at Britannica.
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![A subadult (cypris) and adult barnacles moving their featherlike cirri.
[Encyclopædia Britannica, Inc.]](https://web.archive.org/web/20100427224134im_/http://www.britannica.com/static/bps-static-content/20100421-0831/images/darwin/shared/spacer_htc.gif "A subadult (cypris) and adult barnacles moving their featherlike cirri.
[Encyclopædia Britannica, Inc.]")
