Recherches sur les Grégarines (\u3cem\u3eGregarinida: Stenophoridae\u3c/em\u3e) du Diplopode troglobie \u3cem\u3eTyphloiulus bureschi\u3c/em\u3e Verhoeff en Bulgarie

A study of the parasitic fauna, particularly the Gregarines, found in a troglobitic diplopod Typhloiulus bureschi Verhoeff, one of the Iulidae from Bulgarian caves is presented. Data on morphology and taxonomy of the Eugregarines are included. There is a description of a new species, Stenophora typhloiuli. This species is compared with other species of the genus Stenophora

Morphology, Biometry and Ecology of Arcella excavata Cunningham, 1919 (Rhizopoda: Arcellinida)

Summary. Testate amoeba Arcella excavata Cunningham, 1919 , isolated from the aeration tanks of the Sofia's Wastewater Treatment Plant and its morphology, biometry and ecology have been investigated. Based on the rich live material (120 specimens), a detailed morphological description of A. excavata and new data about the cytoplasm and the nuclei of the species are supplied. It was found out that A. excavata is a multinuclear species and the nuclei are usually 3 or 4, rarely 5-6 (1-2% only). These new data, as well as the characteristic shape of the shell and its bigger depth, show clearly that A. excavata is a separate, well distinguishing species. The size frequency distribution analysis indicates that A. excavata is a size-monomorphic species, characterized by a main-size class and a small-size range (all measured individuals have a shell length of 60-70 µm and 98% have a shell breadth of 55-66 µm). The present study shows that A. excavata inhabits polluted waters also and this fact does not confirm the conclusion of Snegovaya that it can be used as a bioindicator of the waters with the saprobity β-α. Probably, it is also a freshwater eurybiont as well as the majority of the known species of family Arcellidae

Recherches sur les Grégarines (\u3cem\u3eGregarinida: Stenophoridae\u3c/em\u3e) du Diplopode troglobie \u3cem\u3eTyphloiulus bureschi\u3c/em\u3e Verhoeff en Bulgarie

A study of the parasitic fauna, particularly the Gregarines, found in a troglobitic diplopod Typhloiulus bureschi Verhoeff, one of the Iulidae from Bulgarian caves is presented. Data on morphology and taxonomy of the Eugregarines are included. There is a description of a new species, Stenophora typhloiuli. This species is compared with other species of the genus Stenophora

Premi\ue8res observations sur les Th\ue9camœbiens interstitiels du supralittoral marin des Antilles fran\ue7aises

Volume: 6Start Page: 263End Page: 27

Molecular phylogeny of euglyphid testate amoebae (Cercozoa: Euglyphida) suggests transitions between marine supralittoral and freshwater/terrestrial environments are infrequent

Marine and freshwater ecosystems are fundamentally different regarding many biotic and abiotic factors. The physiological adaptations required for an organism to pass the salinity barrier are considerable. Many eukaryotic lineages are restricted to either freshwater or marine environments. Molecular phylogenetic analyses generally demonstrate that freshwater species and marine species segregate into different sub-clades, indicating that transitions between these two environments occur only rarely in the course of evolution. It is, however, unclear if the transitions between freshwater and environments characterized by highly variable salinities, such as the marine supralittoral zone, are also infrequent. Here, we use testate amoebae within the Euglyphida to assess the phylogenetic interrelationships between marine supralittoral and freshwater taxa. Euglyphid testate amoebae are mainly present in freshwater habitats but also occur in marine supralittoral environments. Accordingly, we generated and analyzed partial SSU rRNA gene sequences from 49 new marine/supralittoral and freshwater Cyphoderiidae sequences, 20 sequences of the Paulinellidae, Trinematidae, Assulinidae, and Euglyphidae families as well as 21 GenBank sequences of unidentified taxa derived from environmental PCR surveys. Both the molecular and morphological data suggest that the diversity of Cyphoderiidae is strongly underestimated. The results of our phylogenetic analyses demonstrated that marine supralittoral and freshwater euglyphid testate amoeba species are segregated into distinct sub-clades, suggesting that transitions between these two habitats occurred only infrequently