New records of non-indigenous <i>Branchiomma</i> and <i>Parasabella</i> species (Sabellidae: Annelida) in South Australia highlight the continuing challenges for sabellid taxonomy

Sabellid fanworms (Sabellidae: Annelida) and particularly species of <i>Branchiomma</i> and <i>Parasabella</i> are difficult to discriminate due to a lack of unambiguous diagnostic characters and high intraspecific morphological plasticity. We studied specimens identified as <i>Branchiomma</i> and <i>Parasabella</i> from a marina in South Australia. Examination of morphological features alone failed to resolve the unambiguous identification of specimens to species. Therefore, two DNA markers, the nuclear internal transcribed spacer (ITS) and the mitochondrial cytochrome c oxidase I (<i>cox1</i>), were sequenced. Phylogenetic analyses and genetic distances were performed for each DNA marker, including <i>Branchiomma</i> and <i>Parasabella</i> sequences available in GenBank. Molecular analyses indicate that specimens belong to species that have previously been reported as cryptogenic and occurring in several worldwide harbour environments, but whose identity is still unsettled. A discussion about the relevance of several sources of information for species delineation, and the importance of taxonomy, is provided.