Abyssal fauna of the UK- 1 polymetallic nodule exploration area, Clarion-Clipperton Zone, central Pacific Ocean: Mollusca Author Wiklund, Helena Author Taylor, John D. Author Dahlgren, Thomas G. Author Todt, Christiane Author Ikebe, Chiho Author Rabone, Muriel Author Glover, Adrian G. text ZooKeys 2017 707 1 46 http://dx.doi.org/10.3897/zookeys.707.13042 journal article http://dx.doi.org/10.3897/zookeys.707.13042 1313-2970-707-1 6A0BCD992749450C874B440D0C0A232C 6A0BCD992749450C874B440D0C0A232C Leptochiton macleani Sirenko, 2015 Material examined. NHM_446 NHMUK 20170073.1-2, collected 2013-10-20, 13.86367 -116.54432, 4050 m. http://data.nhm.ac.uk/object/d69b581d-8a79-4c4d-8f70-88b2ec07d86e Description. The form and pattern of tegmental granules together with the three aesthete pores are most similar to the images of Leptochiton macleani (Sirenko, 2015: figs 34-36). Voucher NHM_446 length approx 10 mm, width 3.2 mm (Fig. 21). Figure 21. Leptochiton macleani Sirenko, 2015. NHM_446 voucher specimen. A Live specimen (lateral view) after recovery from the ROV scoop sample B Preserved specimen (ventro-lateral view) following DNA extraction C Dorsal view D surface detail E SEM of tegmentum surface and pores. Scale bars: 4 mm (A); 0.5 mm (D); 0.3 mm (E). Image attribution Glover, Taylor, Ikebe, Dahlgren & Wiklund, 2017. Genetic data. GenBank NHM_446 16S-MF157466, 18S-MF157497, COI-MF157523. Remarks. Sirenko (2015) has recently reviewed Leptochiton of the southeastern Pacific Ocean and described several new species that had been previously confounded with Leptochiton belknapi Dall, 1878. The specimen morphologically matches Leptochiton macleani , type locality Peru-Chile Trench, East Pacific, 4600 m depth. Forms a unique monophyletic clade distinct from other AB01 specimens. No genetic matches on GenBank. In the molecular analyses based on the 18S and COI genes, it falls with strong support as sister taxon to two other Leptochiton species, but in the phylogenetic tree the genus Leptochiton is not monophyletic (Fig. 22). Figure 22. Phylogenetic analysis of Leptochitonidae , Polyplacophora . 50% majority rule consensus tree from the Bayesian analyses, combining 18S and COI. Asterisks denotes posterior probability values of 95 or above. Ecology. Specimen collected from an ROV scoop in region of sediment and polymetallic nodules, presumed living associated or on the nodule surface, but not directly observed doing so.