Figure 3. Arrangement of the body wall and arm ossicles of <i>Psammaster davidsoni</i> (a, b, c, d) and the ambulacral groove (e, f). Photographs (a, c, e) and interpretation drawings (b, d, f) of the lectotype NHMUK PI E 53996. Dashed lines indicate uncertain contour of the ossicles. Coloured areas indicate ossicle homology. In orange: the central ossicle; in red: the madreporite; in green: carinals; in pink: abactinals; in blue: superomarginals; in yellow: inferomarginals; in brown: actinals; in grey: ambulacrals; in purple: adambulacrals; in teal: adambulacrals spines. Scale bars: 5 mm.
Fau M., Villier L. Ewin T.A.M., Gale A.S. (2020)
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Fau M., Villier L. Ewin T.A.M., Gale A.S. (2020). A revision of <i>Ophidiaster davidsoni</i> de Loriol and Pellat 1874 from the Tithonian of Boulogne (France) and its transfer from the Valvatacea to the new forcipulatacean genus <i>Psammaster</i> gen. nov. <i>Fossil Record</i>. 23(2): 141–149. <a rel="nofollow" class="external free" href="https://doi.org/10.5194/fr-23-141-2020">https://doi.org/10.5194/fr-23-141-2020</a>