Haccourtaster aemstelensis Jagt, 2000

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 : 331

Haccourtaster aemstelensis Jagt, 2000

Fig. 2A–K

2000 Haccourtaster aemstelensis Jagt : p. 408, pl. 27, figs 1–6.

2005 Haccourtaster aemstelensis Jagt : Žítt, p. 226.

Type material. An ultimate superomarginal figured by Jagt (2000, pl. 27, fig. 1) is the holotype ( NHMM MB 1044- 6/c) and other marginals illustrated by Jagt (2000, pl. 27, figs 2–5) are paratypes ( NHMM MB 1044-6d–f), basal Zeven Wegen Member (Gulpen Formation), lowermost upper Campanian, Haccourt, northeastern Belgium.

Diagnosis. A small Haccourtaster (R estimated to have been 5 mm) in which the external surfaces of the marginals bear deeply impressed, large, closely spaced granule pits separated by rugosities on the abactinal surfaces of the superomarginals and the actinal surfaces of the inferomarginals.

Additional material. Eight additional marginals from the same horizon and locality as the type material ( NHMM JJ 16614 ) .

Remarks. Haccourtaster aemstelensis differs from all other species of the genus in its possession rugose marginal ossicles and deeply impressed granule pits of variable size.

Figures

FIGURE 2. Species of Haccouraster. A–K, Haccourtaster aemstelensis Jagt, 2000. A, B, isolated median superomarginal, in abactinal (A) and proximal interradial (B) views (NHMM JJ 16614a). C, ultimate superomarginal, in abactinal view (NHMM JJ 16614b). D, E, ultimate inferomarginal, in actinal (D) and abactinal (E) views (NHMM JJ 16614c). F, ultimate superomarginal, in abactinal view (the original of Jagt 2000, pl. 27, fig. 1; holotype, NHMM MB 1044-6/c). G, ultimate superomarginal, in abactinal view (the original of Jagt 2000, pl. 27, fig. 4; paratype, NHMM MB 1044-6/f). H, I, median superomarginal in interradial (H) and actinal (I) views (the original of Jagt 2000, pl. 27, figs 3, 5; paratype, NHMM MB 1044-6/e). J, K, median inferomarginal, in actinal (J) and proximal interradial (K) views (NHMM JJ 16614d), lower upper Campanian (conica/ mucronata Zone, sensu germanico), basal Zeven Wegen Member (Gulpen Formation), former CPL SA quarry, Haccourt (Liège, Belgium). L–O, Haccourtaster nattestadae sp. nov., holotype individual (MGUH 34867), in upper (L) and lower (M) views. N, enlargement of median superomarginal. O, enlargement of superomarginal pair, Arnager Limestone, lower Coniacian, Arnager (Bornholm, Denmark). Scale bars equal 0.5 mm (A–K), 1 mm (N, O) and 5 mm (L, M).