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  • Artikel  (46)
  • Turbellaria
  • Springer  (46)
  • American Meteorological Society
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  • Blackwell Science Ltd
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  • Biologie  (46)
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  • Artikel  (46)
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  • Springer  (46)
  • American Meteorological Society
  • American Physical Society (APS)
  • Blackwell Science Ltd
  • Copernicus
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  • 2005-2009
  • 2000-2004
  • 1995-1999  (10)
  • 1980-1984  (36)
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  • 1
    Digitale Medien
    Digitale Medien
    Ultrastructure of the epidermis of adult and embryonic Paravortex species (Turbellaria, Eulecithophora) (1981)
    Springer
    Hydrobiologia 84 (1981), S. 241-252 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Eulecithophora ; Paravortex ; Cerastoderma ; parasites ; ultrastructure ; epidermis ; embryo capsule
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The epidermis and associated structures of adult and embryonic Paravortex cardii and Paravortex karlingi, internal parasites of Cerastoderma edule, have been examined using scanning and transmission electron microscopy. The cellular epidermis of adult Paravortex bears cilia and microvilli which differ in number and distribution between P. karlingi and P. cardii. Cellular organelles include mitochondria, lipid bodies, Golgi bodies, and ultrarhabdites. Epidermal nuclei are located in the proximal portion of the cells. The development of the tegument of embryo Paravortex has been described and a possible origin for the embryo capsule is suggested. These findings are discussed in relation to the phylogenetic status of the Turbellaria in relation to other Platyhelminthes and in the functional adaptation of the epidermis for a parasitic mode of life.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026186
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The ultrastructure of the eyes in larval and adult polyclads (Turbellaria) (1981)
    Springer
    Hydrobiologia 84 (1981), S. 267-275 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Polycladida ; epidermal eye ; cerebral eye ; ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Examination of the larvae of Thysanozoon brocchii and Stylochus mediterraneus shows that they have both epidermal and cerebral eyes, while the young worms of Notoplana alcinoi have only cerebral eyes. A description is given of the ultrastructure of both kinds of eyes. The epidermal eye consists of one cup-shaped pigmented cell, whose cavity is filled with lamellae of ciliary origin. A small covering cell is located over the cup-opening. The cerebral eye is made up of three cells: one pigmented cell with ciliary projections and two rhabdomeric-type photoreceptor cells. The cerebral eye in the adult is formed of a pigmented cup without cilia and at least three rhabdomeric-type photoreceptors. A number of remarks of a morpho-onthological nature are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026189
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Observations on the ultrastructure of the copulatory organ of Archilopsis unipunctata (Fabricius, 1826) (Proseriata, Monocelididae) (1981)
    Springer
    Hydrobiologia 84 (1981), S. 277-285 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Proseriata ; Archilopsis unipunctata ; ultrastructure ; copulatory organ
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The copulatory organ in adult specimens of Archilopsis unipunctata has been studied by transmission electron microscopy. This copulatory organ is of the conjuncta-duplex type with eversible cirrus. The seminal vesicle, lined with a nucleate epithelium, is surrounded by spirally arranged muscles. The fibres are enclosed in a sheath that is continuous with the septum of the bulbus and the basement lamina of the male canal epithelium. Distally to the seminal vesicle the bulbus is filled with the secretory cell-necks of the prostate glands. The male canal shows three different parts: seminal duct, ejaculatory duct and eversible cirrus. At the transition of seminal duct and ejaculatory duct two prostate ducts open into the lumen. The structure of the epithelium lining the different parts of the canal is described. The transition into the cirrus may be recognized by an abrupt change in the thickness, the electron density and the stratification in the basement lamina and by the disappearance of the epithelium absent indeed in the cirrus. The material found inside the cirrus-lumen is different according to the zone considered. The origin of this material and of the cirrus teeth is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026191
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    The karyotypes of Dugesia species from Spain (Turbellaria, Tricladida) (1981)
    Springer
    Hydrobiologia 84 (1981), S. 45-52 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Tricladida ; Dugesia ; karyology ; Spain
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Some species of Planarians, new to Spain, are recorded. Dugesia polychroa, D. sicula, D. iberica and D. gonocephala s. 1. have been investigated karyologically. The former possesses a diploid complement characteristic of the biotype A (2n = 8); the second is diploid with 2n = 18; diploidy and triploidy were found in sexual populations of D. iberica with n = 8. Triploidy occurred in all the asexual strains of the D. gonocephala group with a basic number of either 8 or 9. In this latter case B-chromosomes were occasionally found.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026162
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  • 5
    Digitale Medien
    Digitale Medien
    The ecology of the Turbellaria with special reference to the freshwater triclads (1981)
    Springer
    Hydrobiologia 84 (1981), S. 87-90 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Tricladida ; ecology ; freshwater
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract To attempt a complete review of turbellarian ecology in the time and space available would result in superficiality. Therefore, I have restricted this account to the four basic ecological processes which have and continue to determine flatworm distribution and abundance. These are: (1) historical or zoogeographical events which permit or prevent a species from reaching a habitat; (2) physiological limitations of the species vis à vis the habitat; (3) access to suitable energy sources and (4) the effects of competition, predation and parasitism, referred to collectively as bionomic processes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026166
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Notes on the biology of some psammophile Turbellaria of the Black Sea (1981)
    Springer
    Hydrobiologia 84 (1981), S. 129-130 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Cercyra ; Pseudomonocelis ; ecology ; reproduction ; feeding
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The biology of two marine turbellarians, Cercyra hastata (Tricladida) and Pseudomonocelis ophiocephala (Proseriata) has been studied over a period of five years. They are the main components of the biocoenosis of the saccocirrus sand of Sevastopol Bay. These species have a significant role in the processes of secondary production and transformation of the organic matter in the coastal zone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026170
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Development of cilia in embryos of the turbellarian Macrostomum (1981)
    Springer
    Hydrobiologia 84 (1981), S. 231-239 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Macrostomum ; ultrastructure ; ciliogenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Electron microscopy of Macrostomum hystricinum raised in culture shows that ciliogenesis in the worm's epidermal blastomeres begins in embryos 39–41 h old with kinetosomal and de novo genesis of presumptive basal bodies, which are morphologically distinguishable from centrioles of the mitotic apparatus, and proceeds by the migration of basal bodies to the apical plasma membrane of the cells and their production there of ciliary axonemes by an age of 51–53 h when the bastomeres emerge between yolk cells on the embryo's surface. Ciliogenesis continues throughout development with the addition of cilia virtually one by one to the expanding epidermal cells' surfaces. At no time in ciliogenesis are stages seen that might show derivation of these multiciliated cells from the primitive monociliated cell type presumably present in the ancestors of the Turbellaria.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026184
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Ultrastructural observations on paracnids. I: Coelogynopora axi Sopott (Turbellaria, Proseriata) (1981)
    Springer
    Hydrobiologia 84 (1981), S. 253-257 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Proseriata ; Coelogynoporidae ; ultrastructure ; paracnids
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The ‘Schlauchdrüsen’ or paracnids of Coelogynopora axi Sopott, 1972 consist of two components: a muscle cell and a secretory cell. The secretory cell is provided with a tube, which bears a border of microvilli. In the normal position the tube is situated in the interior of the secretory cell, and the microvilli stand at the inner side of the tube. After expulsion of the tube the microvilli are situated at its free surface. The evagination takes place in response to chemical stimuli and is effected by the contraction of the myofibrils of the muscle cell. The paracnids are supposed to be mechanisms of defense. However, conformities with nematocysts and spirocysts of the cnidarians do not exist. The paracnids in other species of the Coelogynoporidae, for example in Invenusta paracnida (Karling, 1966) and Carenscoilia bidentata Sopott, 1972 differ from those of C. axi in many details.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026187
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    50 years of turbellarian research (1981)
    Springer
    Hydrobiologia 84 (1981), S. 1-5 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; T. G. Karling ; biography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026155
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  • 10
    Digitale Medien
    Digitale Medien
    Karyological observations on Polyclads (1981)
    Springer
    Hydrobiologia 84 (1981), S. 31-44 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Turbellaria ; Polycladida ; karyology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A karyological analysis of eight species of Polyclads has been carried out. A chromosome number of n = 10 for Stylochus alexandrinus and for Stylochus mediterraneus was ascertained on germinal lines. A chromosome number of 2n = 20 was ascertained from metaphasic plates from regenerative blastemas of Notoplana alcinoi and Leptoplana tremellaris. A karyometric analysis of this last species permitted the reconstruction of an idiogram. An idiogram was also prepared from metaphasic plates of Stylostomum ellipse obtained from early embryonic mitoses. The chromosome number of this species also was 2n = 20. Chromosome numbers of n = 8 and 2n = 16 were ascertained on germinal lines and metaphasic plates of blastemas in Echinoplana celerrima and on germinal lines and early embryonic mitoses of Stylochoplana maculata. Finally the diploid number 2n = 18 was ascertained on metaphasic plates from regenerative blastema of Yungia aurantiaca.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00026161
    Standort Signatur Erwartet Verfügbarkeit
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