Figure 1. <i>Psammaster davidsoni</i> (de Loriol and Pellat 1874). 
The lectotype NHMUK PI E 53996, in (a) abactinal and (b) actinal views, and (c, d) the paralectotype NHMUK PI E 1499, representing at least two individuals preserved as three separate elements, (c) NHMUK PI E 1499 i, and (d) NHMUK PI E 1499 ii and iii. Scale bars: 1 cm.
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>