Figure 5 in Taxonomy and phylogeny of the 'football stars' (Asteroidea, Sphaerasteridae)

Figure 5. Morphology of the stauranderasterid outgroup, Stauraster primitivus (von Zittel, 1880). A–C, arm, in abactinal, lateral and actinal views, respectively (MZA L246). D–N, isolated ossicles; D–G, I, ossicles from primary circlet; D, E, primary interradial (NHMUK EE 17624); F, G, centrale (NHMUK EE 17625); H, ambulacral ossicle, actinal view (NHMUK EE 17626); I, inner calycinal ossicle (NHMUK EE 17627); J–L, radials (NHMUK EE 17628–17630); M, N, adambulacral ossicles, in abactinal and proximal/distal views, respectively (NHMUK EE 17631–17632). O, reconstruction of apical region of Stauraster. Provenance: A–C, upper Oxfordian of Switzerland. D–N are from the lower Oxfordian, Cardioceras bukowskii ammonite Subzone, basal Couches de Passage, Andelot-Morval, Jura, France (see Gale 2019, for locality details). Colours as in Figure 1. Scale bars: A–C = 10 mm; D–G, I–L = 5 mm; H, M, N = 0.5 mm.