Revision of the genus Robbea (Stilbonematinae: Desmodoridae), worldwide abundant marine nematodes with chromophoric Fe-Br inclusions and the description of a new stilbonematine genus Author Scharhauser, Florian Department for Functional and Evolutionary Ecology, University of Vienna, Vienna, Austria Author Saavedra, Daniel E. M. Department for Functional and Evolutionary Ecology, University of Vienna, Vienna, Austria Author Pröts, Philipp Department for Functional and Evolutionary Ecology, University of Vienna, Vienna, Austria Author Ot, Jörg A. Department for Functional and Evolutionary Ecology, University of Vienna, Vienna, Austria Author Geier, Benedikt Max Planck Institute for Marine Microbiology, Bremen, Germany & Stanford University, School of Medicine, Department of Paediatrics and Infectious Diseases, CA, USA Author Gruber-Vodicka, Harald R. Max Planck Institute for Marine Microbiology, Bremen, Germany & Zoological Institute, Christian-Albrechts-University, Kiel, Germany Author Polikarpov, Maxim European Molecular Biology Laboratory, Hamburg unit c / o DESY, Hamburg, Germany Author Bourenkov, Gleb European Molecular Biology Laboratory, Hamburg unit c / o DESY, Hamburg, Germany Author Leisch, Nikolaus Max Planck Institute for Marine Microbiology, Bremen, Germany & European Molecular Biology Laboratory, Heidelberg, Germany & Department for Functional and Evolutionary Ecology, University of Vienna, Vienna, Austria nleisch@mpi-bremen.de text Zoological Journal of the Linnean Society 2025 2024-03-01 203 1 1 28 https://doi.org/10.1093/zoolinnean/zlae005 journal article 308078 10.1093/zoolinnean/zlae005 68d66729-8c45-4037-96b5-7259359feda2 0024-4082 14850743 Robbea weberae sp.nov. ZooBank registration: http://zoobank.org: urn:lsid:zoobank.org: act: 00CF1524-8B96-40F2-8A40-EC4AEC20BD99 . Type location: Bay of Sant’ Andrea , Elba , Italy ; subtidal sand in 5–6 m depth. Coordinates: 42.808342N , 10.141764 E . Type material: One holotype ( NHMW-ZOO-EV-M-5866 ), five paratypes male ( NHMW-ZOO-EV-M-5867/1-5 ), two paratypes female ( NHMW-ZOO-EV-M-5868/1-2 ). Collection date: April 2016 . Collector: F. Scharhauser . Other material: Several specimens in J.A. Ott collection. Etymology: The species is dedicated to Miriam Weber, scientist and our host at the Hydra Marine Station, Elba. Description: With the characters of the genus. Measurements see Supporting Information, Table S2 . Large (L> 7mm ), extremely slender (a> 200) species, females with much shorter tail than males ( Figures 6 and 7 ). Post-pharyngeal ventral GSO enlarged but not protruding. Cephalic capsule extending over 55–60% of corpus. Corpus about 25% of pharynx length, isthmus 60–63%, bulbus 13–17%. Cuticle extremely finely striated, striae 0.4 µm wide. Vulva strongly cuticularized. Tail conical with rounded tip. Symbiotic bacteria rods, 2.3–2.6X1 µm.