| Summary: | Knowledge about parasite species of orcas, their prevalence and impact on the health status is scarce. Only two records of lungworm infections in orca exist from male neonatal orcas stranded in Germany and Norway. The nematodes were identified as Halocercus sp. (Pseudaliidae), which have been described in the respiratory tract of multiple odontocete species, but morphological identification to species level remained impossible due to the fragile structure and ambiguous morphological features. Pseudaliid nematodes (Metastrongyloidea) are specific to the respiratory tract of toothed whales and are hypothesized to have become almost extinct in terrestrial mammals. Severe lungworm infections can cause secondary bacterial infections and bronchopneumonia and are a common cause of mortality in odontocetes. DNA isolations and subsequent sequencing of the rDNA ITS-2 and mtDNA COI revealed nucleotide differences between previously described Halocercus species from common dolphin ( H. delphini ) and harbour porpoises ( H. invaginatus ) that were comparatively analysed, pointing towards a potentially new species of pseudaliid lungworm in orcas. New COI sequences of six additional metastrongyloid lungworms of seals and porpoises were derived to elucidate phylogenetic relationships and differences between nine species of Metastrongyloidea. The data files can be opened with Microsoft Word or Notepad. Funding provided by: Ministry of Energy, Agriculture, the Environment, Nature and Digitalisation (MELUND)* Crossref Funder Registry ID: Award Number: Funding provided by: National Park Service of Schleswig-Holstein* Crossref Funder Registry ID: Award Number:
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