. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. UPPERMOST CENOMANIAN-BASAL TURONIAN AMMONITES FROM SALINAS, ANGOLA 95 Discussion This genus was erected (Thomel 1969: 651) for moderately evolute forms with coarse rursiradiate, flexuous ribbing and five rows of tubercles across the venter. Differences from other genera are noted under the discussion of Watinoceras. Neocalycoceras was erected without description or diagnosis and is thus a nomen nudum. Haugiceras (type species Acanthoceras haugi Pervinquiere, 1907: 270, pi. 14 (fig. la-b)) (Fig. 22) w
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. UPPERMOST CENOMANIAN-BASAL TURONIAN AMMONITES FROM SALINAS, ANGOLA 95 Discussion This genus was erected (Thomel 1969: 651) for moderately evolute forms with coarse rursiradiate, flexuous ribbing and five rows of tubercles across the venter. Differences from other genera are noted under the discussion of Watinoceras. Neocalycoceras was erected without description or diagnosis and is thus a nomen nudum. Haugiceras (type species Acanthoceras haugi Pervinquiere, 1907: 270, pi. 14 (fig. la-b)) (Fig. 22) was proposed as a subgenus of Pseudocalycoceras for rather inflated forms in which the whorl section was wider than high, the ribs were more rigid and less robust, rursiradiate, but less recurved than in Pseudo- calycoceras The tuberculation was said to be entirely different, in Haugiceras the umbilical tubercles are not twisted into an S, while the tubercles across the venter are rounded and not clavate, and closer together. Into this subgenus, Thomel (1972) placed Pseudocalycoceras angolaense (Spath), P. haugi (Pervin- quiere) and P. robustum Thomel. However, Thomel's separation of Haugiceras from Pseudocalycoceras appears to be artificial, and the author regards the two names as synonyms. tf!§&. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
