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  • 1
    Electronic Resource
    Electronic Resource
    Dwarf males in monogonont rotifers (1998)
    Springer
    Aquatic ecology 32 (1998), S. 361-365 
    Details
    ISSN: 1573-5125
    Keywords: male size ; sexual dimorphism ; gut vestigialization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The main characteristics of the monogonont rotifer males are haploidy, dwarfism, progenesis and gut vestigialization to varying extents. Although these traits co-occur, they are probably unlinked from the evolutionary point of view. Commonly, all of these characteristics are directly related to the small size of the male egg, equipped with a reduced amount of yolk. A more ecological approach can, however, provide additional insights. Haploidy acts as a sex determining mechanism, dwarfism and progenesis derive directly from the egg size, while gut reduction is more evident in planktonic species than in benthic ones. This discrepancy suggests that the rotifers in the two habitats are exposed to different selection pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009986106280
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  • 2
    Electronic Resource
    Electronic Resource
    Rotatory apparatus in Bdelloids (1995)
    Springer
    Hydrobiologia 313-314 (1995), S. 91-98 
    Details
    ISSN: 1573-5117
    Keywords: rotatory apparatus ; rostrum ; Rotifera ; Bdelloidea ; SEM ; systematics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract All Bdelloid Rotifers have the same body plan: elongated body, ciliated apical region (rotatory apparatus or corona), telescopically retractable foot and head with pseudosegments, paired gonads, single dorsal antenna, apical rostrum, ramate mastax. Bdelloids use the rotatory apparatus for both locomotion and collecting food and therefore the shape of the corona and arrangement of the cilia, both related to the animal's life style, probably are important for the fitness of the rotifers. We have analyzed the fine morphology of the corona and the rostrum from species belonging to the four families, Habrotrochidae, Philodinidae, Adinetidae and Philodinavidae, each with its own form of feeding and locomotion. In the rostrum one can distinguish a sensorial area and a ciliated area. The former is common to all bdelloids, while the latter is lacking in the Adinetidae. Three models of corona can be recognized: 1) a simple ciliated field of undifferentiated cilia (Adinetidae), 2) a well developed ciliated field with specialized cilia forming the paired trochi on the disks and the cingulum (Habrotrochidae and Philodinidae), and 3) a ciliated field with a single trochus encompassing rudimentary pedicels and cingulum (Abrochtha). We propose (1) to no longer use Digononta as a taxon, (2) to assign the class rank to Bdelloidea, (3) to distinguish three orders, grouping Philodinidae and Habrotrochidae under a single order and (4) to retain the current families.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025935
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  • 3
    Electronic Resource
    Electronic Resource
    The rotifer corona by SEM (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 131-134 
    Details
    ISSN: 1573-5117
    Keywords: SEM ; Rotifera ; methodology ; anesthesia ; deciliation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The scanning electron microscope (SEM) is a powerful tool to observe any surface at the ultrastructural level. During the last 15 years, I developed techniques to process rotifer specimens for SEM observation, in order to obtain images of preserved specimens that simulate their natural appearance. A characteristic feature in Rotifera is the rotatory apparatus (corona) and SEM is appropriate for studying its organization. The organization of the corona is better understood if the rotatory apparatus can be examined after the cilia have been removed. A method to prepare the rotifers for observation by SEM is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017071728408
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  • 4
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships of phylum Rotifera with emphasis on the families of Bdelloidea (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 101-107 
    Details
    ISSN: 1573-5117
    Keywords: Acanthocephala ; aschelminthes ; cladistics ; evolution ; Gnathostomulida ; phylogeny ; pseudocoelomates ; Rotifera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated phylogenetic relationships of phylum Rotifera using cladistic analysis to uncover all most-parsimonious trees from a data set comprising 60 morphological characters of nine taxa: one Acanthocephala, six Rotifera, and two outgroups (Turbellaria, Gnathostomulida). Analysis of our matrix yielded a single most-parsimonious tree. From our analysis we conclude the following: (1) Class Digononta is paraphyletic; (2) it is still premature to reject rotiferan monophyly; (3) the classification hierarchy that best conforms to this morphologically based, cladistic analysis is similar to several traditional schemes. In spite of these results, it is significant that this analysis yielded a tree that is incongruent with those trees developed from molecular data or by using the principles of evolutionary taxonomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017057619574
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  • 5
    Electronic Resource
    Electronic Resource
    Key to the identification of the genera of bdelloid rotifers (2000)
    Springer
    Hydrobiologia 418 (2000), S. 73-80 
    Details
    ISSN: 1573-5117
    Keywords: Rotifera ; Bdelloidea ; pictorial key ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We propose a simple, user-friendly key joined to a pictorial key to the bdelloid genera, in the attempt to make bdelloid identification more accessible to non-bdelloid-specialists. The key is mostly based on illustrations rather than on descriptions, and is accompanied by an introduction of the main features readily observable in active bdelloids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003840216827
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  • 6
    Electronic Resource
    Electronic Resource
    The rotifer corona by SEM (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 131-134 
    Details
    ISSN: 1573-5117
    Keywords: SEM ; Rotifera ; methodology ; anesthesia ; deciliation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The scanning electron microscope (SEM) is a powerful tool to observe any surface at the ultrastructural level. During the last 15 years, I developed techniques to process rotifer specimens for SEM observation, in order to obtain images of preserved specimens that simulate their natural appearance. A characteristic feature in Rotifera is the rotatory apparatus (corona) and SEM is appropriate for studying its organization. The organization of the corona is better understood if the rotatory apparatus can be examined after the cilia have been removed. A method to prepare the rotifers for observation by SEM is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017071728408
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  • 7
    Electronic Resource
    Electronic Resource
    Phylogenetic relationships of phylum Rotifera with emphasis on the families of Bdelloidea (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 101-107 
    Details
    ISSN: 1573-5117
    Keywords: Acanthocephala ; aschelminthes ; cladistics ; evolution ; Gnathostomulida ; phylogeny ; pseudocoelomates ; Rotifera
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated phylogenetic relationships of phylum Rotifera using cladistic analysis to uncover all most-parsimonious trees from a data set comprising 60 morphological characters of nine taxa: one Acanthocephala, six Rotifera, and two outgroups (Turbellaria, Gnathostomulida). Analysis of our matrix yielded a single most-parsimonious tree. From our analysis we conclude the following: (1) Class Digononta is paraphyletic; (2) it is still premature to reject rotiferan monophyly; (3) the classification hierarchy that best conforms to this morphologically based, cladistic analysis is similar to several traditional schemes. In spite of these results, it is significant that this analysis yielded a tree that is incongruent with those trees developed from molecular data or by using the principles of evolutionary taxonomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017057619574
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  • 8
    Electronic Resource
    Electronic Resource
    Old and new data on Seisonidea (Rotifera) (1993)
    Springer
    Hydrobiologia 255-256 (1993), S. 495-511 
    Details
    ISSN: 1573-5117
    Keywords: Biology ; geographical distribution ; morphology ; phylogeny ; Rotifera ; Seison ; Seisonidea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Class Seisonidea consists of one marine genus, Seison, with two species (S. nebaliae and S. annulatus) which are epizoic on the crustacean Nebalia. Seisonidea are the only rotifers whose reproduction is strictly bisexual. They also possess the unusual feature of having well-developed males. In this paper we review the literature concerning biogeographical distribution, relationships with their host, and morphology, and present new information obtained with SEM and optical microscopy of both living animals and serial sections. Some seisonid characters, such as the paired retrocerebral organ, nervous system, and trophi, suggest that they hold a primitive position within phylum Rotifera. However, they do share features with other rotifers: paired gonads and an unusual locomotory behavior with Bdelloidea; lateral antennae, cellular stomach wall, arrangement of intracytoplasmic lamina, and other characters with Monogononta. Some features are peculiar to Seison: obligatory amphimixis, endolecythal eggs, encysted spermatozoa, unique mastax, and absence of copulatory organ in males and of vitellaria in females. Reduction of the corona and absence of resistant stages in Seisonidea may be related to their habitat and to their life style. We propose a closer relationship of Seisonidea to Monogononta than previously asserted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025879
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  • 9
    Electronic Resource
    Electronic Resource
    The Philodinavidae (Rotifera Bdelloidea): a special family (1998)
    Springer
    Hydrobiologia 385 (1998), S. 77-85 
    Details
    ISSN: 1573-5117
    Keywords: Bdelloidea ; Philodinavidae ; rotatory apparatus ; phylogeny ; SEM ; systematics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Here we focus on the fine morphology and present observations on the biology of representatives of family Philodinavidae. Philodinavus paradoxus and Henoceros falcatus were collected and cultured under laboratory conditions. Rotifers of both species are tiny, about 200 μm long, have protrudable trophi and creep with leech-like movements. A very specific feature of these rotifers is their corona; a V-shaped lower lip contours the mouth opening, bilaterally bordered by two arched cuticular structures (‘cheeks’). The presence of the cheeks is a feature shared by the third genus, Abrochtha. On the basis of the morphology and biology of the three genera, we advance the hypothesis that Philodinavus is a primitive bdelloid, and that it can have originated Henoceros and Abrochtha, from which the other bdelloids could have stemmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003458611180
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  • 10
    Electronic Resource
    Electronic Resource
    The Philodinavidae (Rotifera Bdelloidea): a special family (1998)
    Springer
    Hydrobiologia 385 (1998), S. 77-85 
    Details
    ISSN: 1573-5117
    Keywords: Bdelloidea ; Philodinavidae ; rotatory apparatus ; phylogeny ; SEM ; systematics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Here we focus on the fine morphology and present observations on the biology of representatives of family Philodinavidae. Philodinavus paradoxus and Henoceros falcatus were collected and cultured under laboratory conditions. Rotifers of both species are tiny, about 200 μm long, have protrudable trophi and creep with leech-like movements. A very specific feature of these rotifers is their corona; a V-shaped lower lip contours the mouth opening, bilaterally bordered by two arched cuticular structures (‘cheeks’). The presence of the cheeks is a feature shared by the third genus, Abrochtha. On the basis of the morphology and biology of the three genera, we advance the hypothesis that Philodinavus is a primitive bdelloid, and that it can have originated Henoceros and Abrochtha, from which the other bdelloids could have stemmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003458611180
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