Studies on Euphausiacean Crustaceans from the Indian River Region of Florida. I. Systematics of the Stylocheiron Longicorne Species-group, with Emphasis on Reproductive Morphology

نویسنده

  • Paula M. Mikkelsen
چکیده

—Reproductive organ morphologies in members of the Stylocheiron longicorne species-group are compared. Although reproductive structures of 3 of the 7 species are unique, those of S. microphthalma, S. suhmii, S. affine, and S. longicorne are very similar, with minor differences possibly attributable to maturity of the structures. Other allegedly speciesspecific characters (primarily eye structure) are variable and apparently related to size of the individual and habitat depth. The 4 species, interpreted as ontogenetic or ecotypic forms of a single polymorphic species, are synonymized under the name Stylocheiron suhmii G. O. Sars, 1883. The reliability of reproductive structures is restored for species diagnoses within the S. longicorne species-group to a level consistent with that in other euphausiids.

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تاریخ انتشار 2010