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  • 1
    Electronic Resource
    Electronic Resource
    An ultrastructural investigation of Hrabeiella Pižl & Chalupský, 1984 (Annelida). I. Chaetae and body wall organization (1996)
    Springer
    Hydrobiologia 334 (1996), S. 229-239 
    Details
    ISSN: 1573-5117
    Keywords: Hrabeiella ; cuticle ; epidermal gland cells ; muscles ; peritoneum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Specimens of Hrabeiella sp., collected for the first time in Italy (Tuscany), were investigated by transmission and scanning electron microscopy. Chaetae conform with previous descriptions in light microscopy, but appear considerably different in electron microscopy, as they show an unusual brush-like pattern. The first TEM analysis of the body wall layers was undertaken. The cuticle ultrastructure is similar to that found generally in very small-sized annelids, in that a coarse collagenous grid is absent, but it is peculiar for the paucity of ascending microvilli. Three different types of secretory cells are distinguishable in most of the 12 epidermal glandular blocks occurring around the body circumference. Such blocks regularly alternate with as many muscle fields, each containing four longitudinal fibres. A subepidermal layer of circular muscles is present. The somatopleure is cellular and complete.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017373
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  • 2
    Electronic Resource
    Electronic Resource
    The Enchytraeid fauna of North Africa (1994)
    Springer
    Hydrobiologia 278 (1994), S. 53-66 
    Details
    ISSN: 1573-5117
    Keywords: Enchytraeidae ; taxonomy ; distribution ; North Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract As part of a survey of the Mediterranean enchytraeids, large numbers of samples were collected from a wide range of habitats at 38 localities of Tunisia and Algeria in 1989. Twenty species were identified belonging to six genera. Five species are new records for Tunisia and 17 are new for Algeria. Most of the recorded species are widely distributed throughout Europe, or even cosmopolitan, but some have a more restricted range. Fridericia caprensis has a circummediterranean distribution, Fridericia sardorum seems to be endemic to the western Mediterranean and Fridericia berninii is known only from the Balearic Islands and Algeria. Enchytraeus minutus bisetosus n. ssp. is described. A critical revision of some species is also provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00142311
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    Paper (German National Licenses)
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