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A newly compiled data set of nearly complete sequences of the large subunit of the nuclear ribosome (LSU or 28S) sampled from 31 diverse medusozoans greatly clarifies the phylogenetic history of Cnidaria. These data have substantial power to discern among many of the competing hypotheses of relationship derived from prior work. Moreover, LSU data provide(More)
BACKGROUND The question of how many marine species exist is important because it provides a metric for how much we do and do not know about life in the oceans. We have compiled the first register of the marine species of the world and used this baseline to estimate how many more species, partitioned among all major eukaryotic groups, may be discovered. (More)
The mutation pat1-114 has been used to synchronize meiosis in the fission yeast Schizosaccharomyces pombe. We have investigated several aspects of such synchronized meiotic cultures. In both pat1-114 and pat1 + diploids, meiotic landmark events are initiated at the same time after meiosis induction, but synchrony is much more pronounced in the(More)
The ade1 gene of the fission yeast Schizosaccharomyces pombe encodes a bifunctional polypeptide with glycinamide ribotide synthetase (GARSase) and aminoimidazole ribotide synthetase (AIRSase) enzeyme activities. These enzyme activities carry out the 2nd and 5th steps, respectively, of the purine synthetic pathway. We report the cloning of the ade1 gene on a(More)
Two fundamental life cycle types are recognized among hydrozoan cnidarians, the benthic (generally colonial) polyp stage either producing pelagic sexual medusae or directly releasing gametes elaborated from an attached gonophore. The existence of intermediate forms, with polyps producing simple medusoids, has been classically considered compelling evidence(More)
The marine hydroid Plumularia setacea has a near-cosmopolitan distribution. As in other sessile invertebrates with limited dispersal abilities, the wide distribution could also be a taxonomic artefact and the species might in fact be a complex of sibling species. To investigate this, a set of worldwide samples of P. setacea and several closely related(More)
The current status of Plumularia lagenifera Allman, 1885, a common thecate hydroid of the west coast of the USA and Canada, is problematic as it is difficult to distinguish from the near cosmopolitan and very variable Plumularia setacea. Type material of P. lagenifera and newly collected material of P. lagenifera and P. setacea from the region of the type(More)