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Species Phylloceras (Neophylloceras) surya Forbes 1846 | ||||||
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| Diagnosis / Definition: | ||||||
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FATMI & Kennedy (1999): DESCRIPTION.- Two phragmocones GSP1035-1036, 95.4 and 97.9 mm in diameter show very involute coiling: umbilicus 6 percent of diameter (Table 1); whorl section compressed oval with whorl breadth to height ratio 0.48-0.61; greatest breadth below mid-flank. Flanks feebly convex; venter broadly rounded. Fifteen widely separated low, narrow ribs arise at umbilical shoulder. Feebly convex and prorsiradiate on inner flanks, straight and effacing on outer flanks, splitting into delicate wiry lirae. Additional lirae arise on inner to middle flank, strengthen on outer flanks and venter that bear even regular ornament of crowded lirae. Suture deeply incised and finely divided; lobes and saddles with narrow axial zones. Ward & Kennedy (1993): Description.- Biscay material of fragments only, indicating a species up to at least 90 mm diameter. Coiling very involute, with highly distinctive ornament of low, narrow, distant inner flank ribs that bear bundles of coarse to fine prorsiradiate lime that also cover interspaces. These strengthen markedly on outer flank and venter, which latter they cross in broad convexity. |
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| Discussion / Comments: | ||||||
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FATMI & Kennedy (1999): TYPES.- The lectotype, by the subsequent designation of Kennedy and Henderson, 1992a, p. 391, is BMNH (251074, the original of Kossmat, 1895, pl. 15(2), fig. 1; paralectotypes are BMNH C51076-51079, from the Upper Maastrichtian Valudavur Formation of Pondicheny, south India. OTHER MATERIAL EXAMINED.- GSP 1035-1036. OCCURRENCE.- The present specimens are from the Upper Maastrichtian Korara Shale, north of Korara Lak, and Goth Haji Ismail, southern Pab Range, Pakistan. The species is also known from the Maastrichtian of south India, Madagascar, Zululand (South Africa), western Australia, Chile, the Biscay region of southwest France, and Denmark. DISCUSSION.- The present specimens partially overlap in size with the lectotype, from which they differ in no significant details. See Henderson and McNamara (1985, p. 42, pl. 1, figs. 7, 8, 11, 12; pl. 2, figs. 1, 2; text-fig. 2g). Ward & Kennedy (1993): Types. - Syntypes are BMNH C51074-5 1079, including C51075, the original of Forbes, 1846, P1. 7, fig. 10, all from the Valudavur Formation of Pondicherry, south India. Discussion.- A number of Forbes' syntypes are illustrated (Figure 18.3, 18.14, 18.16, 18.17). They show beyond doubt that the Biscay fragments belong to the present species. Henderson and McNamara (1985) studied a suite of 42 specimens from the upper Maastrichtian of western Australia, and demonstrated convincingly that Epiphylloceras mikobokense Collignon, 1956 (p. 24, P1. 2, fig. 3, P1. 4, fig. 5) and E. geczyi Collignon, 1971(p. 1, P1.640, fig. 2360)are synonyms of surya. Differences from other species are discussed by these authors. 0ccurrence.- In the Biscay sections this taxon ranges from high in Member I (lower Maastrichtian) to the base of Member V (upper Maastrichtian). Elsewhere, the species is restricted to the Maastrichtian, with records from south India, Madagascar, Zululand (South Africa), western Australia, and Chile. |
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| Systematics: | ||||||
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38 Ordo Ammonoidea Subordo Phylloceratina Superfamilia Phyllocerataceae Familia Phylloceratidae Subfamilia Phylloceratinae Genus Phylloceras Genus Phyllopachyceras Subgenus Neophylloceras Species Phylloceras (Neophylloceras) surya Species Phyllopachyceras forbesianum 47 Ordo Ammonoidea Familia Phylloceratidae Subfamilia Phylloceratinae Genus Phylloceras Subgenus Neophylloceras Species Phylloceras (Neophylloceras) surya |
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| Synonym list: | ||||||
| FATMI & Kennedy (1999): 1846 Ammonites surya Forbes. - Forbes : p.106 pl. 7; fig. 10
1992 Phylloceras (Neophylloceras) surya Forbes. - Kennedy & Henderson : p.391 pl. 1, fig. 1-7, 9, 13-14;
pl. 15, fig. 4, 5 [with synonymy]
1993 Phylloceras (Neophylloceras) surya Forbes. - Ward & Kennedy : p.16 fig. 17.13, 18.3, 18.4, 18.16, 18.17
1993 Phylloceras (Neophylloceras) surya Forbes. - BIRKELUND : p.43 pl. 2; fig. 2
1999 Phylloceras (Neophylloceras) surya Forbes. - FATMI & Kennedy : p. 645, 660 fig. 4.1-4.6, 15.3
Ward & Kennedy (1993): 1846 Ammonites surya Forbes. - Forbes : p.106 pl. 7; fig. 10
1985 Phylloceras (Neophylloceras) surya Forbes. - Henderson & McNamara : p.42 pl. 1, fig. 7, 8, 11, 12;
pl. 2, fig. 1, 2;
text-fig. 2g (with synonymy)
1986 Phylloceras (Hypophylloceras) surya Forbes. - Stinnesbeck : p.193 pl. 7; fig. 5, 6
1993 Phylloceras (Neophylloceras) surya Forbes. - Ward & Kennedy : 18, 19 fig. 17.13, 18.3, 18.4, 18.16, 18.17
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| Was used in synonym list of: | ||||||
| Stratigraphy - relative ages: | ||||||
| upper Maastrichtian - lower Maastrichtian: Ward & Kennedy (1993) |
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| References: | ||||||
Forbes,E.. (1846): Henderson,R.A.. and McNamara,K.J.. (1985): Stinnesbeck,W.. (1986): Kennedy,W.J.. and Henderson,R.A.. (1992): Ward,P.D.. and Kennedy,W.J.. (1993): BIRKELUND,T.. (1993): FATMI,A.N.. and Kennedy,W.J.. (1999): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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