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The relation between cypris ultrastructure and metamorphosis in male and female Sacculina carcini (Crustacea, Cirripedia)

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Summary

To elucidate current controversies on sex in rhizocephalan barnacles, broods of Sacculina carcini, infesting the shore crab Carcinus maenas, were raised to cyprids in the laboratory and followed through settlement and metamorphosis. Free-swimming cyprids were studied by transmission electron microscopy and occur in male and female morphological types, which differ in the structure of carapace cuticle, antennular cuticle, antennular glands, and the cells suspected of being the stem cells during metamorphosis. These dissimilarities are in addition to the already known differences in cypris size, in number of antennular sense organs, and in substrata settled on by morphological males and females. Metamorphosing males (trichogons) and females (kentrogons) are illustrated in interference phase-contrast micrographs. The morphological differences between male and female cyprids are directly related to their dissimilar metamorphosis. Hence, cyprids of male morphology are anatomically incapable of metamorphosing into kentrogons, while cyprids of female morphology cannot metamorphose into trichogons. The determination of sex in rhizocephalan barnacles is discussed.

The results refute the hypothesis that sex in Sacculina carcini is determined environmentally, e.g., by the substratum encountered by the cyprids at settlement. It is concluded that sex is determined already in the free-swimming larvae and, most probably, already in the ovary. This agrees with the mode of sex determination in other species of the Rhizocephala Kentrogonida.

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  1. Institute of Cell Biology and Anatomy, The Zoological Institutes, University of Copenhagen, 15 Universitetsparken, DK-2100, Copenhagen, Denmark

    J. T. Høeg

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Høeg, J.T. The relation between cypris ultrastructure and metamorphosis in male and female Sacculina carcini (Crustacea, Cirripedia). Zoomorphology 107, 299–311 (1987). https://doi.org/10.1007/BF00312176

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