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Further records of nauplius Y type IV Hansen from Scandinavian waters
Schram, T.A. (1972). Further records of nauplius Y type IV Hansen from Scandinavian waters. Sarsia 50: 1-24
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827, more
Peer reviewed article  

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Keyword
    Marine

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  • Schram, T.A.

Abstract
    Nauplius y IV larvae of different size and developmental stages from Oslofjorden are illustrated, described, and compared with y IV larvae described by HANSEN (1899) and others. The material includes both shorter and longer y IV larvae than have been recorded previously and the longer y IV larvae possessed a longer carapace than that of the oldest nauplius I on record. Although the known number of nauplius I larvae from Oslofjorden is much higher than that of nauplius IV the latter type seems to be more abundant outside the fjord. Nauplius IV larvae also have a much wider geographical distribution, in fact amphi-Atlantic. A summary of this distribution is revealed, as well as an outline of misconceptions in ealier literature.Nauplius I and IV represent two different species which have been inaccurately treated in the literature. The parental forms of the y larvae are probably close to the Cirripedia, but the final answer cannot be given at present.

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