Tetrastemma vermiculus has records from many places; Russia and Scandinavia as well as U.K, U.S. and European atlnatic coasts. Maybe it is a circumglobal species, or maybe there are cryptic species.
- MALIN STRAND, PER SUNDBERG*Delimiting species in the hoplonemertean genus Tetrastemma (phylum Nemertea): morphology is not concordant with phylogeny as evidenced from mtDNA sequences
- Biological Journal of the Linnean Society
- Volume 86, Issue 2, pages 201–212, October 2005
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