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Showing result 1 - 5 of 6 swedish dissertations matching the above criteria.

  2. 1. Exploring the species boundaries in terrestrial clitellates (Annelida: Clitellata)

    Author : Svante Martinsson; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Oligochaeta; species delimitation; Clitellata; Annelida; DNA-barcoding; cryptic species; Enchytraeidae; Lumbricidae; Naididae;

    Abstract : The biological diversity in the soil is much higher than most people can imagine, and a very important group of animals living there are earthworms and other clitellate worms. It has been found that several clitellate morphospecies are in fact complexes of so called cryptic species, and the number of species in this group may be much higher than previously believed. READ MORE

  4. 2. Early Palaeozoic jawed polychaetes with focus on polychaetaspids and ramphoprionids from the Silurian of Gotland, Sweden

    Author : Mats Eriksson; Berggrundsgeologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fysisk geografi; Geologi; physical geography; Geology; chemistry; palaeobiogeography; palaeoecology; taxonomy; apparatus reconstructions; Silurian; Recent; Ordovician; early Palaeozoic; scolecodonts; Annelida; polychaeta;

    Abstract : Jawed polychaete annelid worms were abundant and diverse in the early Palaeozoic seas and their jaws (scolecodonts) are common microfossils in sedimentary rocks of that age. Despite their abundance, relatively little work has been focused on these fossils. READ MORE

  5. 3. Systematics of Marionina (Annelida: Clitellata: Enchytraeidae)

    Author : Lisa Matamoros; Göteborgs universitet; []
    Keywords : Marionina; Michaelsena; Enchytronia; Enchytraeidae; cryptic species; molecular phylogeny; taxonomy; systematics; genetic diversity;

    Abstract : This thesis is about species of segmented worms that previously were placed in the genus Marionina Michaelsen, 1890, within the family Enchytraeidae, class Clitellata and phylum Annelida. These species are closely related to earthworms, but are much smaller and many of them are found between the sand grains in marine beaches. READ MORE

  6. 4. Evolutionary Perspectives on Naidinae (Annelida, Clitellata, Naididae): Molecular and Morphological Revelations

    Author : Ida Envall; Christer Erséus; Lena Gustavsson; Mari Källersjö; Endre Willassen; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Naididae; Naidinae; phylogenetics; molecular systematics; morphology; ultrastructure; Biology; Biologi; systematisk zoologi; Systematic Zoology;

    Abstract : Naidinae is a group of tiny oligochaetous clitellates, common all over the world, primarily in freshwater. The taxon includes about 180 nominal species. READ MORE

  7. 5. Tubificids with trifid chaetae: morphology and phylogeny of Heterodrilus (Clitellata, Annelida)

    Author : Erica Sjölin; Christer Erséus; Lena Gustavsson; Mari Källersjö; Katrine Worsaae; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Heterodrilus; phylogeny; morphology; Tubificidae; Systematics and phylogenetics; Systematik och fylogeni; Systematic Zoology; systematisk zoologi;

    Abstract : Heterodrilus is a marine group of small (3-25 mm) clitellates that occur interstitially in sandy sediments from the intertidal zone down to about 150 m depths. The taxon includes 42 valid species and has been recorded from localities in the Mediterranean Sea, the North-west Atlantic Ocean (including the Caribbean), the Galapagos Islands, and the Indo-Pacific Region. READ MORE