dc:title"Revision of the sixgill sawsharks, genus Pliotrema (Chondrichthyes, Pristiophoriformes), with descriptions of two new species and a redescription of P. warreni Regan";
dc:description"Fig 1. Pliotrema kajae sp. nov., holotype, MNHN 1987–1266, juvenile female, 560 mm TL, preserved. a lateral, b dorsal, and c ventral views. Scale bar: 5 cm. https://doi.org/10.1371/journal.pone.0228791.g001";
dc:description"Fig 2. Pliotrema kajae sp. nov. paratypes, preserved. a,b,c paratype SAIAB 84096, adult male, 940 mm TL, in a lateral, b dorsal, and c ventral views; d paratype SAIAB 84039, gravid female, 1143 mm TL, in lateral view. Scale bars: 5 cm. https://doi.org/10.1371/journal.pone.0228791.g002";
dc:description"Fig 3. Pliotrema kajae sp. nov., holotype, MNHN 1987–1266, juvenile female, 560 mm TL, preserved. Head in a lateral, b dorsal, and c ventral views. Scale bar: 5 cm. https://doi.org/10.1371/journal.pone.0228791.g003";
dc:description"Fig 4. Pliotrema kajae sp. nov., paratype, RHL-Mad-01, presumably adult female, estimated TL 1100 mm, SEM images of rostral teeth. a,b large lateral rostral tooth in a total and b close-up views; c–h small interstitial lateral rostral teeth in c–f total and g–h close-up views; i,j ventral rostral spine in i total and j close-up views. Scale bars: a,b,d,f 1 mm, c,e 200 μm, g–i 100 μm, j 20 μm. https://doi.org/10.1371/journal.pone.0228791.g004";
dc:description"Fig 6. Pliotrema kajae sp. nov., paratype, SAIAB 84096, adult male, 940 mm TL, SEM images of oral teeth. a–c upper anterolateral tooth in a oblique-labial and b,c occlusal views; d–f upper posterolateral tooth in d oblique-labial and e,f occlusal views; g–i lower anterolateral tooth in g oblique-labial and h,i occlusal views; j–l lower posterolateral tooth in j oblique-labial and k,l occlusal views. Scale bars: 200 μm. https://doi.org/10.1371/journal.pone.0228791.g006";
dc:description"Fig 7. Pliotrema kajae sp. nov., paratype, SAIAB 84039, gravid female, 1143 mm TL, SEM images of oral teeth. a–c upper anterolateral tooth in a oblique-labial and b,c occlusal views; d–f upper posterolateral tooth in d,e oblique-labial and f occlusal views; g–i lower anterolateral tooth in g oblique-labial and h,i occlusal views; j–l lower posterolateral tooth in j oblique-labial and k,l occlusal views. Scale bars: 200 μm. https://doi.org/10.1371/journal.pone.0228791.g007";
dc:description"Fig 9. Pliotrema kajae sp. nov., paratype, RHL-Mad-01, presumably adult female, estimated TL 1100 mm, SEM images of single rostral dermal denticles. a,b apical views, c lateral view, d–f basal d total and e,f close-up views. Scale bars: a,b,d 100 μm, c 50 μm, e 10 μm, f 3 μm. https://doi.org/10.1371/journal.pone.0228791.g009";
dc:description"Fig 10. Pliotrema kajae sp. nov., holotype, MNHN 1987–1266, juvenile female, 560 mm TL, preserved, lateral views of fins. a pectoral, first dorsal, and pelvic fins, b second dorsal and caudal fins. Scale bar: 5 cm. Note ventral precaudal ridge in b. https://doi.org/10.1371/journal.pone.0228791.g010";
dc:description"Fig 11. Pliotrema kajae sp. nov., paratype, SAIAB 84096, adult male, 940 mm TL, preserved, claspers. a left clasper in dorsal view, b right and left claspers in ventral view. https://doi.org/10.1371/journal.pone.0228791.g011";
dc:description"Fig 12. Radiographs of the crania of the three species of Pliotrema in dorsal views. a P. kajae sp. nov., holotype, MNHN 1987–1266, juvenile female, 560 mm TL (image merged from two radiographs), b P. annae sp. nov., holotype, ZMH 26361, presumably adult female, 981 mm TL, c P. warreni, DMM I-E/4946, female, 785 mm TL. https://doi.org/10.1371/journal.pone.0228791.g012";
dc:description"Fig 13. Pliotrema kajae sp. nov., fresh images of paratypes. a,b paratype SAIAB 84096, adult male, 970 mm TL fresh, c, d paratype SAIAB 84039, gravid female, 1170 mm TL fresh. The photographs were taken and kindly provided by Oddgeir Berg Alvheim, Institute of Marine Research, Bergen, Norway. https://doi.org/10.1371/journal.pone.0228791.g013";
dc:description"Fig 14. Map of the southwestern Indian Ocean depicting the catch locations of the examined specimens of all three species of Pliotrema. Holotype (white star) and paratypes (white circles) of Pliotrema kajae sp. nov., holotype (gray star) and paratype (gray circle) of Pliotrema annae sp. nov., and intact (black diamond) and dissected (black triangle) syntypes, as well as other specimens (black squares) of Pliotrema warreni. https://doi.org/10.1371/journal.pone.0228791.g014";
