Haccourtaster hrbac Žítt, 2005

Gale, Andrew S. & Jagt, John W. M., 2025, New species of the asteroid genus Haccourtaster Jagt, 2000 (Echinodermata, Goniasteridae) from the Upper Cretaceous of Denmark, Sweden and the United Kingdom, Zootaxa 5632 (2), pp. 325-336 : 330

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).

Figures

FIGURE 1. A–F. Haccourtaster liticola sp. nov. A, superomarginal frame in abactinal view, reconstructed from isolated marginals (NHMUK PI EE 18204–18224). B, inferomarginal frame from one side of disc, reconstructed from isolated marginals (NHMUK PI EE 18212–18215). C, abactinal view of median superomarginal (holotype, NHMUK PI EE 18204). D, abactinal view of ultimate superomarginal (paratype, NHMUK PI EE 18205). E, inferomarginal in actinal view (paratype, NHMUK PI EE 18206). F, interradial view of inferomarginal-superomarginal pair (paratypes, NHMUK PI EE 18207, 18208), upper lower Campanian, Ivö Klack, southern Sweden. G–I, Haccourtaster berryensis sp. nov. (NHMUK PI EE 18203). G, abactinal view of superomarginals from one side of disc, reconstructed from associated ossicles. H, reconstructed actinal view of inferomarginals; lower Turonian, Mytiloides mytiloides inoceramid Zone, Berry Cliff, Branscombe (Devon, UK}. J–M. Haccourtaster hrbac Žítt, 2005. J, partial superomarginal frame of juvenile in abactinal view (the original of Žítt, 2005, fig. 4G; NMP O 6369). K, L, superomarginal frame, reconstructed in abactinal (K) and actinal (L) views (NMP O 6362; the original of Žítt, 2005, figs 3, 4). M, interradial profile of superomarginal-inferomarginal pair, the original of Žítt, 2005, fig. 3F (NMP O 6365), uppermost part of Korycany Member, lower Turonian, Velim-Vaclav, Bohemian Basin, Czech Republic. Scale bars equal 1 mm.