New <i>Fabriciola</i> species (Polychaeta, Sabellidae, Fabriciinae) from the eastern Atlantic, with a description of sperm and spermathecal ultrastructure

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Abstract

<jats:p>New species in the genus <jats:italic>Fabriciola</jats:italic> Friedrich are described. <jats:italic>Fabriciola</jats:italic> is defined by a single synapomorphy, the presence of non‐vascularized, ventral filamentous appendages. Otherwise the genus is variable, with differences among species in chaetae, eyes, and peristomial organization. The new species, <jats:italic>Fabriciola flammula, F. liguronis</jats:italic> and <jats:italic>F. parvus</jats:italic>, reflect this heterogeneity. <jats:italic>Fabriciola liguronis</jats:italic> has spermathecae in the radiolar crown of females, the first record of these structures in <jats:italic>Fabriciola</jats:italic>, but F. <jats:italic>flammula</jats:italic> and <jats:italic>F. parvus</jats:italic> lack spermathecae. Sperm ultrastructure in all three species share apomorphies with other fabriciins, but vary in other respects. <jats:italic>Fabriciola</jats:italic> may be paraphyletic, but material of the type species <jats:italic>F. spongicola</jats:italic> (Southern, 1921) has been unobtainable so far, and detailed study of this species is required to define the genus <jats:italic>Fabriciola</jats:italic> adequately.</jats:p>

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