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worsaae.bsky.social
Worsaae lab, UCPH
@worsaae.bsky.social
91 followers 49 following 6 posts
Work with meiofauna evolution, development, nervous systems & biodiversity
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worsaae.bsky.social
New addition to the spectacular life cycle of Osedax worms: sex of O. japonicus is genetically (not environmentally) determined since larvae show both morphological and transcriptomic signatures of gender. Might help us explain male dwarfism rdcu.be/eCHBe
@alicerouan.bsky.social @NorioMiyamoto
New life cycle hypothesis of the bone-eating worm Osedax having sexually predetermined larvae. Schematic drawing of Osedax development with sexually determined embryos developing into sexually determined larvae, female larvae having a gut, male larvae lacking one. Drawings are not scaled.
August 27, 2025 at 1:59 PM
worsaae.bsky.social
Join the best invertebrate event of 2025!
The official website for the 6th International Congress on Invertebrate Morphology (ICIM6) is now live! Check it out:
icim6.com
Thank you Felipe and colleagues for hosting this!
March 13, 2025 at 6:50 PM
worsaae.bsky.social
Our paper describing the second species of Micrognathozoa, Limnognathia desmeti, is out: doi.org/10.1098/rspb... - big thanks to all coauthors, to Willem H. De Smet for finding this species, and to the Villum Foundation a.o. for supporting this project!
Micrognathozoa, or ‘little jaw animals’, are one of the ~32 evolutionarily independent lineages on the animal tree of life. This phylum contains some of the smallest animals reaching a maximum size of 150µm. Populations are found in Greenland, the Pyrenees Mountains, and a Subantarctic island. Despite this disjoint distribution, there is currently only one described species, Limnognathia maerski. After almost a decade of collecting effort, the Katrine Worsaae group here at BIO, UCPH, joining teams from USA, UK, France, and Spain, was able to collect samples from all three populations. With this new material, using advanced microscopy, single-cell transcriptomic techniques, and machine learning, we interrogate the relationships among populations, test species limits, and infer their biogeographic history for the first time. Although we find no morphological differences, genetic data distinguish the Subantarctic population as a separate species, here named Limnognathia desmeti. The distribution of this old freshwater phylum, Micrognathozoa, can only be explained by overseas dispersal which raises questions about potential dormant life stages and undiscovered populations.
February 19, 2025 at 3:06 PM
worsaae.bsky.social
Big congrats to Jan Raeker and collaborators on this great paper:
doi.org/10.1016/j.ym...
The crowning glory moment of Jan's PhD :-) presenting an exiting phylogenomic study of Priapulida (penis worms) with unexpected predictions:
Priapulidans may have started out with microscopic body sizes, lack of caudal appendages, and internal fertilization; and macroscopic size and traits evolving secondarily. Where could this go 🫣... Scalidophora ancestrally meiofaunal? ... Ecdysozoans?
February 3, 2025 at 9:35 PM
worsaae.bsky.social
Join the "Zoomorphology & Evolution Meeting" at Dep. of Biology, UCPH, 13-19:30, 7 March 2025
Best wishes
Katrine Worsaae & Peter Funch
January 20, 2025 at 9:10 PM