Abstract
The phylogenetic analysis in this study, based on a fragment of the CO 1 mtDNA gene, provides first evidence in favour of Brokeland's (2010) conclusion of recent or ongoing gene flow in Haploniscus rostratus (Menzies, 1962) across the Walvis ridge. Itadds the first evidence for the presence of either restricted gene flow or potential cryptic species in the Guinea Basin. The data suggest furthermore that distinct species within the H. unicornis complex occur sympatrically in the East Atlantic deep-sea basin north of the Walvis Ridge. However, without more specimens (males in particular) and more markers, other processes that may have generated this pattern cannot be excluded.
NSTL