Morphotypes observed on X-ray photographs of Ophidion rochei. Photographs highlight the swimbladder and mineralized structures (as the skeleton, rocker bone, otoliths). Negatives of photographs are displayed to facilitate observation. (a-c) Typical morphotype of (a) male, (b) female, and (c) juvenile Ophidion rochei. (d) Intermediary morphotype hypothesized to be a young male O. rochei. Modifications of the swimbladder are evident in photographs of males: the rocker bone (RB), the internal tube (IT), the neck (N), and the gelatinous substance (GS). Radiographed specimens measured (a) 206 mm, (b) 197 mm, (c) 116 mm, and (d) 153 mm in TL.