each station. Samples were screened through sieves of mesh size 0.5 or 1 mm. Samples were fixed in 96% alcohol or in 10% borax buffered formaldehyde. Samples were subsequently sorted under a stereo microscope at the Natural History museum, University of Bergen.
For Scanning Electron Microscopy (SEM) images, the shells were being cleaned and dried and mounted onto aluminum stubs with conductive carbon cement, and subsequently sputtered with gold-palladium alloy using a Bio-Rad SEM Coating System. Images were obtained using a Zeiss Supra VP55 microscope and edited in Adobe Photoshop CS4 Extended.
All specimens, with the exception of some paratypes, are deposited at the Natural History Collections, Bergen Museum, University of Bergen.