. Bulletin of the Natural Histort Museum. Geology series. . Fig. 27 Camera lucida drawings of plating in Pseudoffaster caucasicus (Dru, 1884) from the Maastrichtian of Sarasate (Navarra); BMNH EE6234. a, apical surface; b. oral surface; c, lateral profile; d, posterior profile. Interambulacra shaded. Scale bar = 5 mm. Occurrence. Maastrichtian, horizon 2, Santander. The type of this species was reported from the 'Garumnian" (?Maastrichtian) of the Pyrenees-Atlantiques, France. Material STUDIED. BMNHEE6188. Remarks. Unfortunately, we have only a single specimen of this interesting species.
. Bulletin of the Natural Histort Museum. Geology series. . Fig. 27 Camera lucida drawings of plating in Pseudoffaster caucasicus (Dru, 1884) from the Maastrichtian of Sarasate (Navarra); BMNH EE6234. a, apical surface; b. oral surface; c, lateral profile; d, posterior profile. Interambulacra shaded. Scale bar = 5 mm. Occurrence. Maastrichtian, horizon 2, Santander. The type of this species was reported from the 'Garumnian" (?Maastrichtian) of the Pyrenees-Atlantiques, France. Material STUDIED. BMNHEE6188. Remarks. Unfortunately, we have only a single specimen of this interesting species. The very anterior mouth, opening into the frontal groove immediately distinguishes this species from Offaster. whose mouth is downward-facing and not opening into an anterior sulcus. Amongst holasteroids only Galeaster possesses a subanal fasciole, orthostemous plating and a distinct frontal sulcus. However, the apical disc has the two anterior genital plates fused in Galeaster, according to Poslavskaya & Moskvin (1960), whereas our specimen undoubtedly has a suture separating genital plates two and three. We do not know what the apical disc plating in Seunes' type material is like. Order SPATANGOIDA Claus, 1876 Diagnosis. Ovate to heart-shaped with compact apical disc with four genital plates. Posterior interambulacral plates differentiated to form a plastron adorally. Aboral ambulacra typically with pore-pairs enlarged and forming petals; often depressed. Family MICRASTERIDAE Lambert 1920 Diagnosis. Apical system ethmophract; plastron mesamphi- stemous. Aboral tuberculation consisting of larger primary tubercles dispersed amongst a dense groundmass of fine Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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