. Bulletins of American paleontology. 44 Bulletin 348 South America it is reported from the Meridianus Zone which correlates in part with the Ibex and Davoei stan- dard zones (Hillebrandt, 1981, 1987, 1990). Metadewceras evoluliim is the earliest species ofMe- taderoceras in the Queen Charlotte Islands. In the Whi- teavesi Zone it is joined by several other species of Metadewceras which are generally more coarsely and more densely ribbed and which may have given rise to Dubariceras. This coarse ribbed group also includes the stout-whorled, strongly tuberculate M. moiiterdei and related forms w
. Bulletins of American paleontology. 44 Bulletin 348 South America it is reported from the Meridianus Zone which correlates in part with the Ibex and Davoei stan- dard zones (Hillebrandt, 1981, 1987, 1990). Metadewceras evoluliim is the earliest species ofMe- taderoceras in the Queen Charlotte Islands. In the Whi- teavesi Zone it is joined by several other species of Metadewceras which are generally more coarsely and more densely ribbed and which may have given rise to Dubariceras. This coarse ribbed group also includes the stout-whorled, strongly tuberculate M. moiiterdei and related forms which are reminiscent of the circum- Mediterranean M. venarense group that Dommergues and Mouterde (1982) interpret to be the root-stock of the Dactylioceratidae in the Ibex Text-figure 33. â Whorl shape cross-sections for species of the Eod- eroceratidae. Figures are natural size. a. Metadewceras lalkeetnaense Thomson and Smith, 1992 (GSC 98703); b. Metadewcerasevolutum (Fucini, 1921) (GSC 95576); c. Meladeroceras sp. (GSC 98702); d. Metaderocerasf aff. mouterdei (Frebold. 1970) (GSC 87797); e. Du- bariceras freholdi (Dommergues et al., 1984) (GSC 98686). Metaderoceras evolutum (Fucini, 1924) Plate 16, figures 3-5, 7; Plate 18, figure 1; Text-figures 33b, 34a Deroceras evolutum Fucini, 1924, p. 50, pi. 5, fig. 14. Crucilohiceras aff. evolutum (Fucini). Du Dresnay, 1963, p. 147, pi. 2, figs. 2, 3. Crucilobiceras pacificum Frebold, 1970, p. 435, pi. 1, figs. 4-8. Crucilobiceras evolutum brutum Wiedenmayer, 1977, p. 59, pi. 13, figs. 1, 2. Crucilobiceras evolutum evolutum (Fucini). Wiedenmayer, 1977, p. 59, pi. 13, fig. 3: 1980, p. 48, pi. 1, figs. 3, 4. Metaderoceras evolutum (Fucini). Dubar and Mouterde, 1978, p. 44, pi. 2, fig. 1; Rivas, 1983, p. 395, pi. 1, figs. 1-8; Smith, Tipper, Taylor and Guex, 1988, pi. 1, fig. 11; Thomson and Smith, 1992, p. 22, pi. 9, figs. 5-6. Metaderoceras evolutum brutum (Fucini). Colera. Rivas, Sequeiros and Valenzuela, 1978, p. 311, pi. 1
Size: 2236px × 1118px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorpaleonto, bookcentury1800, bookdecade1890, bookyear1895
