Personal profile
Primary fields of research
My general field of interest is the diversity, phylogeny, and evolution of Crustacea.Teaching
- Main responsible for the course: Marine invertebrater: morfologi, biologi, evolution
- Teach on the course: Marin faunistik: Marine fisks og invertebraters diversitet og biologi
Introductory remarks on publicationslist
Current research
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I am an evolutionary zoologist focusing on the diversity and classification of Crustacea, a diverse group of mainly marine arthropods, but with both limnic and terrestrial representatives. I also curate the large museum collection of Crustacea. My research interests ranges from species level taxonomy of Laevicaudata, a small group of freshwater crustaceans, to higher level phylogeny of various crustacean groups. I am interested in a large range of crustacean taxa such as branchiopods from inland temporary water bodies, remipedes and thermosbaenaceans from anchialine caves, raptorial cladocerans from the Caspian Lake, and many others. I mainly work with morphology as a basis for phylogeny, but also include molecular data. I have a particular focus on obscure, microscopic taxa and their larvae, about which little are still known. I also work on various important Cambrian fossil taxa on a collaborative basis. One of my overall goals is to contribute bringing our understanding of crustacean evolution and phylogeny to a higher level, not least with respect to how various key characters such as the evolutionary crucial ‘arthropod limbs’ have evolved in different crustacean linages.
Collaborations and top research areas from the last five years
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Mating behaviour in laevicaudatan clam shrimp (Crustacea, Branchiopoda) and functional morphology of male claspers in a phylogenetic context: a video-based analysis
Sigvardt, Z. M. S. & Olesen, J., 2014, In: PLoS ONE. 9, 1, 20 p., e84021.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile19 Citations (Scopus)2831 Downloads (Pure) -
Onychocaudata (Branchiopoda: Diplostraca), a new high-level taxon in branchiopod systematics
Olesen, J. & Richter, S., 1 Jan 2013, In: Journal of Crustacean Biology. 33, 1, p. 62-65 4 p.Research output: Contribution to journal › Journal article › Research › peer-review
40 Citations (Scopus) -
Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci
Richter, S., Olesen, J. & Wheeler, W. C., 2007, In: Cladistics. 23, p. 301-336Research output: Contribution to journal › Journal article › Research › peer-review
120 Citations (Scopus) -
A New, Tiny Species of “Y-Larva” (Pancrustacea: Thecostraca: Facetotecta) from Okinawa, Japan, Described with SEM on the Basis of Laboratory-Reared Last Naupliar and Cyprid Stages
Grygier, M. J. & Olesen, J., 2026, In: Species Diversity. 31, p. 91-114Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile2 Downloads (Pure) -
Abundance survey of crustacean “y-larvae” (Thecostraca: Facetotecta) over a fringing reef in Okinawa, Japan, with special reference to the two dominant planktotrophic and lecithotrophic naupliar types
Olesen, J., Grygier, M. J., Palero, F., Dreyer, N., Eibye-Jacobsen, D. & Fujita, Y., 2025, In: Marine Biodiversity. 55, 13 p., 9.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile2 Citations (Scopus)37 Downloads (Pure) -
High diversity and new species of meiofaunal Nerillidae (Annelida) in subtidal sediments and anchialine caves of the East China Sea
Worsaae, K., Hansen, M. J., Defourneaux, É., Olesen, J., Park, J., Park, T. & Fujita, Y., 2025, In: European Journal of Taxonomy. 1021, p. 1-54 54 p.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile34 Downloads (Pure) -
Phylogenomics of enigmatic crustacean y-larvae reveals multiple origins of parasitism in barnacles
Dreyer, N., Bernot, J. P., Olesen, J., Kolbasov, G. A., Høeg, J. T., Machida, R. J. & Chan, B. K. K., 2025, In: Current Biology. 35, 14, p. 3356-3367 16 p.Research output: Contribution to journal › Journal article › Research › peer-review
1 Citation (Scopus) -
The Complete Larval Development of the Pedunculated Barnacle Capitulum mitella (Crustacea: Cirripedia) Using a Standardized Terminology
Kado, R., Dreyer, N., Olesen, J., Waloszek, D. & Høeg, J. T., 2025, In: Zoological Studies. 56 p., 34.Research output: Contribution to journal › Journal article › Research › peer-review
Open AccessFile2 Citations (Scopus)31 Downloads (Pure)