. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 50. A. Aperture of Sciponoceras sp. with distinct lappets. After Marcinowski (1980, pi. 3 (fig. 16)). B. Sciponoceras baculoide (Mantell, 1822), alleged microconch with lappets. After Marcinowski (1980, pi. 3 (fig. 17)). Sciponoceras orientate Matsumoto & Obata (1963, pi. 7 (fig. 3)) from the Lower and Middle Turonian of Hokkaido. It has a hooded aperture with trigonal ventral rostrum and acute apex. Sciponoceras intermedium Matsumoto & Obata (1963, pi. 8 (fig. 1), pi. 11 (fig. 6)) from
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 50. A. Aperture of Sciponoceras sp. with distinct lappets. After Marcinowski (1980, pi. 3 (fig. 16)). B. Sciponoceras baculoide (Mantell, 1822), alleged microconch with lappets. After Marcinowski (1980, pi. 3 (fig. 17)). Sciponoceras orientate Matsumoto & Obata (1963, pi. 7 (fig. 3)) from the Lower and Middle Turonian of Hokkaido. It has a hooded aperture with trigonal ventral rostrum and acute apex. Sciponoceras intermedium Matsumoto & Obata (1963, pi. 8 (fig. 1), pi. 11 (fig. 6)) from the Upper Turonian of Hokkaido—the aperture is oblique, facing dorsally, the ventral rostrum is gently curved, the dorsal rostrum very short. Sciponoceras matsumotoi Inoma (1980, text-fig. 4c, pi. 21 (figs 14, 16)) from the Cenomanian of Hokkaido—the aperture is oblique and the ventral rostrum slightly curved. To summarize, apertures in microconch Sciponoceras are quite diverse, but generally form a slight hood, or may even recurve, some with prominent ventrolateral lappets, others without. Size and development of the dorsal rostrum varies. In some, possibly macroconchs the aperture is simple and oblique. With the possible exception of the case discussed by Marcinowski (1980) dimorphism is also manifested by marked differences in size. Apertures are quite commonly preserved in Baculites. Figured examples include: B. anceps Lamarck. Howarth (1965, pi. 5 (fig. 4)); Kennedy (1986c, pi. 20 (fig. 2)). B. androtsyensis Collignon (1970, pi. 607 (fig. 2272)). B. aquilaensis Reeside (1927a, pi. 8 (figs 1, 4, 7, 12); Reeside (19272?, pi. 2 (figs 1,4, 7, 12)). B. asperiformis Meek. Cobban (19622?, pi. 106 (figs 14-16)). B. capensis Woods. Matsumoto & Obata (1963, pi. 19 (fig. 2)); Klinger & Kennedy (1997, figs 46, 48A, 51-52). B. codyensis Reeside (1927a, pi. 2 (figs 1-3) as B. asper); Kennedy & Cobban (1991a, pi. 15 (figs 13-15)). B. mariasensis Cobban—Kennedy & Cob
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
