Oelandia is an extinct genus of basal molluscs of the family helcionellid from the Middle Cambrian of Sweden, China and North America. It has a small, upwards-pointing anterior snorkel with a closed end. It bears pronounced concentric ribbing around its strongly coiled exogastric shell.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0