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A new hypercalcified chaetetid sponge, Loiscupula bachendensi gen. nov. sp. nov. (Demospongiae), has been recovered from the Bachende Formation (late Kashirian/early Myachkovian) in the Cantabrian Zone, NW Spain. Loiscupula has a circular, concentric, platy basal skeleton, some with cylindrical features and chimneys, which sometimes branch on the upper surface. The basal skeleton is composed of polygonal (commonly hexagonal) to rounded tubules perpendicular to the surface of the skeleton producing the characteristic honeycomb pattern of chaetetids. Cathodoluminescence microscopy revealed non-luminescent calcite pseudomorphs of monoaxon and polyaxon spicules, rarely styles, which are irregularly distributed although there are occurrences that suggest that a spicular network existed. The basal skeleton is composed of neomorphic low-Mg calcite (1.7 mol% MgCO3) and is strongly recrystallized; the tentative penicillate microstructure with relics of aragonite needles, and the high Sr content (up to 3456 ppm), suggest an original aragonite composition. Loiscupula is interpreted as primarily a gregarious organism with an inferred central point of attachment. This mode of growth produced small cryptic cavities between Loiscupula and the substrate, which were inhabited by encrusting organisms, mostly fistuliporid bryozoans. Based on the associated fossils and sedimentological features, it is suggested that Loiscupula inhabited an environment with a muddy bottom in the euphotic zone, where the water was well-oxygenated, of normal salinity, and the energy regime low to moderate. Diego Corrochano. Facultad de Ciencias, Departamento de Geología, Universidad de Salamanca, Plaza de los Caídos s/n, 37008, Salamanca, Spain. dcf@usal.es Ronald R. West. 1014 Houston Street, Manhattan, Kansas, 66502, USA. rrwest@ksu.edu

palaeontologia electronica

 A new plate-like hypercalcified chaetetid demosponge (Loiscupula bachendensi gen. nov. sp. nov) from the Cantabrian Zone (Moscovian, Pennsylvanian, NW Spain)