Computed tomography scanned anterior trunk area of Hippocampus japapigu, UW 157506, male holotype, 16.33 mm SL, Hachijo-jima Island, Japan (photograph Graham Short). A Anterolateral view B Lateral view. Note the pair of spines projecting dorsolaterad on STrR1 and triangular bony mounds arched dorsad on STrR2, STrR3, and STrR4. Abbreviations: CL, cliethral ring; STrR1, first superior trunk ridge; STrR2, second superior trunk ridge; STrR3, third superior trunk ridge; STrR4, fourth superior trunk ridge; STrR5, fifth superior trunk ridge; STrR6, sixth superior trunk ridge.