Abstract Background Pycnogonida (sea spiders) is the sister group of all other extant chelicerates (spiders. scorpions and relatives) and thus represents an important taxon to inform early chelicerate evolution. Notably. phylogenetic analyses have challenged traditional hypotheses on the relationships of the major pycnogonid lineages (families). https://thebrickes.shop/product-category/customizable-bezels/