Hemiaster (Leymeriaster) eluvialis sp. nov. from the Gulpen and Maastricht formations (late Maastrichtian, Belemnitella junior Zone) in the type area of the Maastrichtian Stage is described and illustrated. The new species is compared with other members of the subgenus Leymeriaster , and especially with H. (L.) maestrichtensis , which occurs in the same area. H. (L) eluvialis is interpreted as a descendant of the H. (L) moulinsanus - H. (L.) maestrichtensis group, showing a combination of paedomorphic and peramorphie traits. H. (L.) eluvialis made its first appearance in the Maastrichtian type area during deposition of the Lanaye Member (top Gulpen Formation), while H. (L.) maestrichtensis , the only other representative of the subgenus Leymeriaster in the area, appeared later (Emael Member, Maastricht Formation).