Discometra luberonensis sp. nov. (Crinoidea, Himerometridae), a new feather star from the Late Burdigalian Author Eléaume, Marc 66D3D76C-62AC-4B6D-9A3B-2A2665EA4DB9 Muséum national d’histoire naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, CP 51, 57 rue Cuvier, 75231 Paris Cedex 05, France. marc.eleaume@mnhn.fr Author Roux, Michel 7E6DF41A-A61D-48B2-99EE-A43021E3E739 Muséum national d’histoire naturelle, CNRS, Sorbonne Université, EPHE, Université des Antilles, CP 51, 57 rue Cuvier, 75231 Paris Cedex 05, France. mich.roux51@gmail.com Author Philippe, Michel 457B0CA9-3D41-45FC-A20B-3090B2FA8F18 Centre “ Louis Lortet ” de conservation et d’étude des collections (Musée des Confluences, Lyon) 13 A, rue Bancel - 69007 Lyon, France. mipauphi@wanadoo.fr text European Journal of Taxonomy 2020 2020-12-29 729 121 137 journal article 9070 10.5852/ejt.2020.729.1193 549807f7-2ce5-43fa-8a14-84f13c4ca82c 4419816 6F302AF9-0F04-4380-BA86-5A585C751711 Family Himerometridae A.H. Clark, 1908 Remarks Hess & Messing (2011) placed Himerometridae within the superfamily Mariametroidea A.H. Clark, 1909 (later changed to Himerometroidea by Taylor et al. 2017 ) in which rod-shaped basals are absent.All genera in Himerometridae ( Heterometra A.H. Clark, 1909 , Himerometra , Craspedometra A.H. Clark, 1909 , Amphimetra A.H. Clark, 1909 ), except Discometra , show coelomic grooves on the adoral side of centrodorsal. Amphimetra has multiple radiate coelomic grooves while Heterometra , Himerometra and Craspedometra show Y-shaped grooves with more or less wide branches. In Discometra , such Y-shaped features are present as canals included in the stereom and located just beneath the surface of the proximal facet of radials ( Fontannes 1880 ; Sieverts-Doreck 1961). As a consequence, coelomic grooves are absent from the adoral surface of the centrodorsal. In Himerometra , the aboral facet of each radial displays a pair of wide grooves running in parallel in the inner part and diverging in a Y shape in the outer part; this feature is also visible on the oral side of the centrodorsal ( Fig. 3A ). Coelomic groove patterns are very similar in Himerometra ( Fig. 3A ) and Discometra ( Fig. 4 ) but differ markedly in each of the other genera ( Rasmussen 1978 : figs 593–594). The numerous radiating coelomic grooves (A.H. Clark 1915 ) distinguish Amphimetra the most from the other genera, and Hemery (2011), Summers & Rouse (2014) and Taylor et al. (2017) questioned its attribution to Himerometridae . In Himerometra , the general shape of the centrodorsal varies from hemispherical to almost discoidal. The insertions of cirri on the centrodorsal have a very variable aspect on the same individual, with or without a slight rectangular transverse relief ( Fig. 3B ). The radial circlet delimits a more or less wide adoral cavity whose flanks corresponding to the inner face of the radials are sculpted by strong vermiculate figures ( Fig. 3C ). The distal articular facet of the radials is sub-trapezoidal, the internal (adoral) ligamentary areas, with no distinguishable limit adorally, are separated by a large depression, and the muscular areas are reduced and nearly inconspicuous ( Fig. 3D ). Stratigraphical range Miocene–Recent (Western Pacific), possibly since the Eocene.