FIGURE 3 in Additions to the morphology of the Phyllophoridae and the Sclerodactylidae. I. Type species of Phyllophorella, Selenkiella, Cladolella and Clarkiella, with the description a new species of Thorsonia (Holothuroidea: Dendrochirotida)

FIGURE 3. Phyllophorella robusta (Heding & Panning, 1954), holotype (ZMUC-HOL 249). μCT volume rendering of calcareous ring (a–c) outer view, (d) oblique view, (e) inner view, (f) transverse cross-section at the top region. Unlabeled arrows in (e) point to groove for water vascular system canals. Abbreviations: AB, aquapharyngeal bulb attachment; IR, interradial plate; LMA, longitudinal muscle attachment; midIR, mid-dorsal interradial plate; midR, mid-ventral radial plate; R, radial plate; RMA, retractor muscle attachment. Plate identity follows the system established by Ludwig (1889–1892).