Haccourtaster hrbac Zitt 2005

Haccourtaster hrbac Žítt, 2005 Fig. 1J–M 2005 Haccourtaster hrbac Žítt: p. 226, figs 3–7, 11A. Type material. The holotype is a median superomarginal, figured by Žítt (2005, fig. 4A–E; NMP O 6367); the other ossicles illustrated by Žítt (2005) are paratypes (NMP O 6368, 6370–6394). The material is from the uppermost portion of the Korycany Member (Peruc-Korycany Formation), lower Turonian (Whiteinella archaeocretacea foram Zone) as exposed at Velim-Václav, Czech Republic. Diagnosis. A Haccourtaster of medium size (R = 7–8 mm) in which the median superomarginals have a lateral, abactinal swelling which bears a cluster of deeply impressed granule pits. A row of similar pits is present on the lateral margin of the ultimate superomarginal. Remarks. Haccourtaster hrbac is distinguished by the distinctive tumidity, bearing deeply impressed granule pits, on the lateral part of the median superomarginals, and the narrow ridge along the lateral margin of the ultimate superomarginals which carries a row of similar pits. The species occurs in sediments deposited on a rocky shoreline and is associated with common Metopaster thoracifer (T. Kočí, pers. comm., 2004).