Abstract
We present an updated diagnosis of 13Streptocephalus species of North America. Three new species are included. A key to the species is provided.
The phylogeny of the group is discussed on the basis of (1) a systematic approach (Maeda-Martinezet al., 1995; this volume), which considers the entire distal antennal outgrowth, the frontal appendage, and the morphology of the ovaries as essential in defining different genetic lineages or species-groups, and (2) a cladistic analysis. We suggest that of nine monophyletic groups, three are represented in both the Old and New World. Thus, contrary to former disparsalist hypotheses, we argue that the New World species represent relict forms of ancestral groups fragmented by continental drift (vicariance model).
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Maeda-Martinez, A.M., Belk, D., Obregón-Barboza, H. et al. Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca). Hydrobiologia 298, 15–44 (1995). https://doi.org/10.1007/BF00033798
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DOI: https://doi.org/10.1007/BF00033798