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Detailed morphological study of more than 2600 North East Atlantic (NEA) sphaerodorids (  Sphaerodoridae    Annelida  ) and phylogenetic analyses of DNA sequences of representatives of several identified morphospecies enforced changing the current systematic classification within the family allowed the discovery of new species provided new information about the morphological and genetic characterisation of members of this group and increased the species occurrence data to better infer their geographic and bathymetric distribution ranges. Phylogenetic analyses of nuclear (18S rRNA and 28S rRNA) and mitochondrial sequences (COI and 16S rRNA) of NEA short-bodied sphaerodorids revealed outstanding results including paraphyly of the genera    SphaerodoropsisSphaerodoridium   , and    Sphaerephesia   . The number of longitudinal and transverse rows of dorsal macrotubercles is proposed as potential synapomorphies for the main clades and are consequently herein used for the genera delimitation. The new classification proposed here implies nomenclatural changes and the erection of a new genus    Geminofilum    gen. n.  to accommodate the species previously considered as    Sphaerodoropsis    with two transverse rows of dorsal macrotubercles per segment. Four species are being described herein:    Euritmia   nordica    Capa &amp; Bakken  sp. n.    Sphaerephesia   multichaeta    Capa Moreira &amp; Parapar  sp. n.    Sphaerephesia   ponsi    Capa Parapar &amp; Moreira  sp. n.  and    Sphaerodoridium   celiae    Moreira Capa &amp; Parapar  sp. n.  Characterisation of the other 21 species including updated iconography and an identification key to all NEA short-bodied sphaerodorids are provided.

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Systematic re-structure and new species of   Sphaerodoridae   (  Annelida  ) after morphological revision and molecular phylogenetic analyses of the North East Atlantic fauna