Molecular differentiation in sympatry despite morphological stasis: deep‐sea A tlantoserolis W ägele, 1994 and G labroserolis M enzies, 1962 from the south‐west A tlantic ( C rustacea: I sopoda: S erolidae)

During DIVA ‐3, the third expedition of the DIVA project ( L atitudinal gradients of deep‐sea biodiversity in the A tlantic O cean), 45 specimens of S erolidae were obtained from the A rgentine B asin, at a depth of about 4600 m. These were a new species of G labroserolis and A tlantoserolis vemae ( M enzies, 1962). Besides the description of Glabroserolis occidentalis  sp. nov. , G labroserolis specialis   M enzies, 1962 is redescribed on the basis of the type material. A tlantoserolis vemae is redescribed using the type material, N orth A tlantic specimens, and the new S outh A tlantic material. Morphological differences between specimens of A . vemae from the N orth and S outh A tlantic could not be identified. The molecular data suggest that A . vemae from the A rgentine Basin comprises two deeply divergent clades, which may represent reproductively isolated, sympatric species. © 2014 The Linnean Society of London