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New species of Heterodrilus (Oligochaeta, Tubificidae) and records of H. maiusculus from the Mediterranean Sea
Stockholm University, Faculty of Science, Department of Zoology.
2001 In: Italian Journal of Zoology, no 68, 223-228 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2001. no 68, 223-228 p.
URN: urn:nbn:se:su:diva-24558OAI: diva2:197794
Part of urn:nbn:se:su:diva-7182Available from: 2007-11-22 Created: 2007-11-14Bibliographically approved
In thesis
1. Tubificids with trifid chaetae: morphology and phylogeny of Heterodrilus (Clitellata, Annelida)
Open this publication in new window or tab >>Tubificids with trifid chaetae: morphology and phylogeny of Heterodrilus (Clitellata, Annelida)
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

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. A majority of the species of Heterodrilus are characterized by having trifid anterior chaetae (i.e., chaetae with three teeth at the distal end). A few species have bifid chaetae, but these are regarded as having lost the third tooth secondarily. Within the taxon, species are distinguished by morphological characters in the internal organization of the male and female genitalia, but also by characters in the form and number of chaetae. In this thesis, two new taxa are introduced, Heterodrilus tripartitus and H. ursulae, both from the Mediterranean Sea. The ultrastructure of the cuticle in four species (H. paucifascis, H. pentcheffi, H. flexuosus, H. minisetosus) is studied and it is shown that there is interspecific variation in the morphology of the cuticle. One of the studied species, H. paucifascis, shows intraspecific variation, which is associated with sample locality. The systematic position of Heterodrilus within Tubificidae is studied with molecular markers, and the results support that Heterodrilus (earlier classified as a member of Rhyacodrilinae) is positioned within Phallodrilinae. Furthermore, the phylogenetic relationships within Heterodrilus are estimated based on molecular characters from mitochondrial COI, the 16S rRNA gene, and the nuclear 18S rRNA gene, and the result indicate that the two major clades in our tree corresponds to different geographical distributions. This thesis also includes a checklist, as well as a key, to the species of Heterodrilus.

Place, publisher, year, edition, pages
Stockholm: Zoologiska institutionen, 2007. 42 p.
Heterodrilus, phylogeny, morphology, Tubificidae
National Category
Biological Systematics
Research subject
Systematic Zoology
urn:nbn:se:su:diva-7182 (URN)978-91-7155-533-5 (ISBN)
Public defence
2007-12-14, filmsalen, Naturhistoriska riksmuseet, Frescativägen 40, Stockholm, 10:00
Available from: 2007-11-22 Created: 2007-11-14Bibliographically approved

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