Figure 7; Scanning electron microscopy of the dermal denticles. Squalus shiraii sp. nov. (A, B): HUMZ 149389 (holotype), adult male, 590 mm TL. S. formosus (C, D): CSIRO H-6816-01 (holotype), adult male, 720 mm TL. S. mitsukurii (E, F): HUMZ 102987, adult male, 970 mm TL. S. japonicus (G, H): NSMT-P 44380 (neotype), adult male, 645 mm TL (G); NSMT-P 91127, juvenile female, 410 mm TL (H). S. brevirostris (I, J): NSMT-P 47378, adult female, 600 mm TL (I); KAUM-I 187, adult female, 578 mm TL (J). S. suckleyi (K, L): NSMT P-92640, adult female, 970 mm TL. Scale bars: 50μm (B); 100 μm (D, F, L); 200 μm (A, C, E, G–K).
Figure 4; Squalus japonicus: lateral (A–C) and ventral (D, E) views; first (F) and second (G) dorsal fins; pectoral (H) and caudal (I) fins. NSMT-P 44380 (neotype), adult male, 645 mm TL (A, D, F–I); HUMZ 189738, adult male, 535 mm TL (B); HUMZ 189687, juvenile male, 380 mm TL (C, E). Scale bars: 50 mm (A–E); 20 mm (F–I).
Figure 2; Photos of the voucher specimens of the agnathan and chondrichthyans species collected from the Uraga Suido Channel, the Sagami Sea, Japan. A MTUF-P 30681: Eptatretus atami, 503 mm TL B KPN-NI 47883: Chimaera phantasma, 481 mm TL (tail broken) C KPM-NI 46348: Hydrolagus mitsukurii, 315 mm TL (tail broken) D MTUF-P 30716: Cephaloscyllium umbratile, 489 mm TL E KPM-NI 46359, Apristurus platyrhynchus, 634 mm TL F KPM-NI 46352: Chlamydoselachus anguineus, 1258 mm TL G KPN-NI 47884: Heptranchias perlo, 910 mm TL H KPM-NI 46346: Dalatias licha, 472 mm TL I KPN-NI 47882: Deania calcea, 656 mm TL J KPM-NI 46349: Deania hystricosa, 844 mm TL K MTUF-P 30717: Centrophorus atromarginatus, 453 mm TL L KPM-NI 46356: Cirrhigaleus barbifer, 846 mm TL M KPM-NI 46360: Squalus mitsukurii, 581 mm TL.