The Nerthra elongata species-group is composed of seven species, all of which are endemic to Australia. Two new species are described: Nerthra falcatus Cassis and Silveira n.sp. and Nerthra monteithi Cassis and Silveira n.sp. All are described and illustrated. A phylogenetic analysis of the species is given with all relationships fully resolved.
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Cassis et al. (2002) studied this question.
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