Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 19. 2001. (Budapest, 2001)

increases). The only difference is that the Hungarian specimen is slighdy smaller, and the middle whorls are sparsely ribbed. Since the Sümeg ammonite is deformed, and the innermost whorls cannot be studied, the comparison with figures of the small-sized, non-deformed ammonites of the American literature is problematic. Due to the compaction and corrosion, the Sümeg specimen does not show the important changes of the ratio of height to breadth otherwise characteristic of the close relative, M (D.) danei, and probably for the subgenus itself. The Hungarian specimen is also close to Menabites (Australiella) COLLIGNON, 1948. Both have the very strong ventrolateral tubercles on the middle whorls, but Australiella bears fewer rows of lateral tubercules. The Sümeg ammonite also resembles Neoselwynoceras COLLIGNON, 1966, which was regarded a synonym of Texanites (Texamtesjby WRIGHT et al. (1996). The type of this genus (N. paradoxus COLLIGNON), which is a pathological specimen according to WRIGHT et al. (1996), was refigured by HERM et al. (1979). The Sümeg ammonite is bigger, more involute and the middle whorl is more sparsely ribbed. COLLIGNON's specimen lacks the intercalaries and has a more developed serration on the keel. Distribution — Texanitids, especially Menabites are rare in Europe. Two specimens of M. CD.) delawarensis were reported from Aquitaine (France) (COBBAN & KENNEDY 1992/a), while KÜCHLER & KUTZ (1989) listed Menabites sp., and Menabites (Delawarella) sp. from the Scaphites hippocrepis Zone date Early Campanian) of Navarra (N-Spain). The above-mentioned Neosehvynoceras is known, probably, from the Upper Santonian and Lower Campanian of Madagascar. On a wider geographic scale, texanitids range from the Early Coniacian to the Late Campanian with a peak abundance in the Santonian. The closest ally, Menabites danei was earlier recorded only from North America. Its holotype comes from Oklahoma, from a "formation equivalent to the Gober chalk". Other specimens were collected also from Texas, from the Ozan Formation and from Oklahoma and Colorado. The species is characteristic for the late early Campanian Menabites (Delawarella) delawarensis Zone, and also occurs in the roughly equivalent Baculites obtusus Zone (COBBAN & KENNEDY 1992/a, 1992/b). Order Nautilida DE BLAINVILLE, 1825 Suborder Nautilina DE BLAINVILLE, 1825 Family Nautilidae DE BLAINVILLE, 1825 Genus Angulithes MONTFORT, 1808 Angulithes cf. westphalicus (SCHLUTTER, 1872) (Plate V) 1872 Nautilus Westphalicus n. sp. — SCHLUTTER, p. 13. 1876 Nautilus Westphalicus SCHLUTTER

— SCHLUTTER, p. 175, pl. 47, figs. 1, 2. 1956 Angulithes westphalicus (SCHLUTTER) — KÜMMEL, p. 457, text-fig. 33/1. 1960 ^Angulithes (A.) westphalicus (SCHLUTTER) — WIEDMANN, p. 186, pl. 21. fig. "o". 1999 Deltoidonautilus westphalicus (SCHLUTTER) — WlTTLER et al., p. 37, text-figs. 51 a, b, 52. 2000 Angulithes westphalicus (SCHLUTTER) — WILMSEN, p. 37, pi. 3, figs. 1 a, b, pi. 5, figs. 6, 20. Material — A single specimen (M.63.1354). Description — The medium-sized, rather flattened specimen has a maximum diameter of 206 mm. The nearly complete, but probably not adult body chamber is crushed. The umbilicus is very narrow and cannot be seen well; the flanks are smooth; the venter is highly arched. The maximum breadth of the whorl is at the umbilical shoulder; the cross section is high oval. The suture line (marked by pencil, on the basis of the faint impressions on the mould), is only slighdy sinuous. It has a broad and shallow lateral lobe and a narrow ventral saddle. Remarks — The Sümeg specimen lacks the weak angular sharpening of the venter, this was the main reason for the use of the open nomenclature. The closest form is probably Angulithes triangularis (MONTFORT, 1808) but is has a more curved suture line. Another close ally is Angulithes fleuriausianus (D'ORBIGNY, 1840), which has similarly straight suture line, but is more inflated, at the same time. Explanation to Plate V Angulithes cf. westphalicus (SCHLUTTER, 1872) (M.63.1354), x 1. — Lateral view.