Phylloceras (Neophylloceras)surya Forbes 1846 (TaxonConcept

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Species Phylloceras (Neophylloceras)surya Forbes 1846

Diagnosis / Definition:

FATMI & Kennedy (1999):
Description. -Two phragmocones GSPI035-1036, 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. Types.-The lectotype, by the subsequent designation of Kennedy and Henderson, 1992a, p. 391, is BMNH C51074, the original of Kossmat, 1895, pl. 15(2), fig. 1; paralectotypes are BMNH C51076-51079, from the Upper Maastrichtian Valudavur Formation of Pondicherry, south India. Other material examined.-GSP 1035-1036.

Discussion / Comments:

FATMI & Kennedy (1999):
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).

Systematics:

40
Ordo Ammonoidea
  Subordo Phylloceratina
   Superfamilia Phyllocerataceae
    Subfamilia Phylloceratinae
     Genus Phylloceras
      Subgenus Neophylloceras
       Species Phylloceras (Neophylloceras)surya

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, figs. 1-7, 9, 13-14; pl. 15, figs. 4.5 (With synonymy)

1993 Phylloceras (Neophylloceras)surya Forbes. - Ward & Kennedy : p.16 figs. 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 : 4.1-4.6, 15.3

Stratigraphy - relative ages:

upper Maastrichtian - Maastrichtian: FATMI & Kennedy (1999)

References:

Forbes,E.. (1846):
Report on the Cretaceous fossil invertebrates from southern India, collected by Mr. Kaye and Mr. Cunliffe . Transactions of the Geological Society of London Vol. 2(7) p. 97–174

Kennedy,W.J.. and Henderson,R.A.. (1992):
Non-heteromorph ammonites from the Upper Maastrichtian of Pondicherry, south India . Palaeontology Vol. 35 p. 381-442

Ward,P.D.. and Kennedy,W.J.. (1993):
Maastrichtian ammonites from the Biscay Region . Journal of Paleontology Vol. 67(5 II) p. 1-58

BIRKELUND,T.. (1993):
Ammonites from the Maastrichtian White Chalk in Denmark . Bulletin of the Geological Society of Denmark Vol. 40 p. 33-81

FATMI,A.N.. and Kennedy,W.J.. (1999):
Maastrichtian ammonites from Balochistan, Pakistan. . Journal of Paleontology Vol. 73(4) p. 641-662

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