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  • Enchytraeidae  (1)
  • Oligochaeta  (1)
  • cuticle  (1)
  • 1
    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
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  • 2
    ISSN: 1573-5117
    Keywords: Clitellata ; Oligochaeta ; Hirudinea ; biogeography ; biodiversity ; urban habitats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To increase the overall faunistic knowledge of Swedish Clitellata, a survey was performed in Nationalstadsparken, a mosaic of fresh and brackish waters, parklands alternating with remnants of natural biota, and areas of urban development, within the cities of Stockholm and Solna on the Baltic coast of Sweden (59° N, 18° E). One hundred and twenty-one species (113 Oligochaeta, 8 Hirudinea) were collected at 31 aquatic and 27 terrestrial or littoral localities; 49 species of Oligochaeta were found at the aquatic localities, 70 species at the terrestrial/littoral sites. Twenty-four species are new records for Sweden, and this urban national park thus features 64% of all non-marine clitellates known from the country. The result is consistent with a view that diversity is enhanced when human activities increase habitat complexity, even in areas in direct contact with a large city.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 278 (1994), S. 53-66 
    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
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