Topic
Genus
About: Genus is a research topic. Over the lifetime, 68921 publications have been published within this topic receiving 590966 citations. The topic is also known as: monospecies genus & genus (zoology).
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TL;DR: The delimitation of the erigonine genera Pelecopsis Simon and Trichopterna Kulczyński and the phylogenetic relationships between European and East African species of these genera are discussed and the new genus Locketia is established.
Abstract: On the basis of the results of an analysis primarily of the morphology of the male palps and palpal organs the delimitation of the erigonine genera Pelecopsis Simon and Trichopterna Kulczynski and the phylogenetic relationships between European and East African species of these genera are discussed. For the East African species Pelecopsis convexa (Holm), and P. bacelarae (di Caporiacco), together with two undescribed species from Nigeria, the new genus Locketia is established. Pelecopsis humiliceps sp.n. and P. albifrons sp.n., both from Kenya, are described and P. tenera (Holm, 1962), preocc. P. tenera (Schenkel, 1927), is replaced by P. tenuipalpis nom.n. Viewpoints are presented on evolutionary trends and phylogeny of European and East African Pelecopsis species.
72 citations
TL;DR: It is shown that the forming of swarmers in sessile commensals (peritrichs and chonotrichs) is correlated with the moulting of the host and the distribution of the ciliates within the host genus is controlled mainly by environmental factors.
Abstract: The present paper describes the ciliate epifauna found on the marine species of the amphipod genus Gammarus in Scandinavian waters. Twentyfive species of ciliates were found which, ecologically, could be placed in the following four groups: Suspension feeders, herbivores, carnivores, and parasites. It is shown that the forming of swarmers in sessile commensals (peritrichs and chonotrichs) is correlated with the moulting of the host. While most of the epizoans found on Ganunarus are specific for the genus, the distribution of the ciliates within the host genus is controlled mainly by environmental factors. especially salinity. The marine and brackish water Gammarus species have no ciliates in common with the fresh-water species G. lacustris. Even G. duebeni, when living in freshwater, has an impoverished marine fauna of ciliates. Brackish water populations of Gammarus species were found to harbour the greatest number of ciliate species. This is in contrast to the general concept that a smaller num...
72 citations