Abstract
Haploniscus rostratus (Menzies, 1962) is redescribed from material obtained during deep-sea expeditions to the southeast Atlantic basins. The species is immediately recognizable by its rostrum and the unique shape of the posterior body. Specimens of all developmental stages were present in the material and are briefly described. Information on body length and body width is given and an identification key to the ontogenetic stages is provided. Development and distribution of the species are discussed. Populations of H. rostratus found north and south of the Walvis Ridge have the same morphology and do not represent cryptic species; therefore it is likely that H. rostratus is able to cross the Walvis Ridge, which has been postulated as potential barrier for benthic species by other authors.References
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