Phylloceras (Neophylloceras) surya Forbes 1846 from: Ward, P.D..Kennedy, W.J.. (1993): Maastrichtian Ammonites from the Biscay Region (France, Spain) . Memoir (The Paleontological Society), Journal of Paleontology34 (Supplement to Vol. 67)(5) p. 1-58 | . |
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Species Phylloceras (Neophylloceras) surya Forbes 1846 |
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| Alternative name: |
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| Diagnosis / Definition: |
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. |
| Discussion / Comments: |
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. |
| Systematics: |
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Ordo Ammonoidea
Subordo Phylloceratina
Superfamilia Phyllocerataceae
Familia Phylloceratidae
Subfamilia Phylloceratinae
Genus Phylloceras
Genus Phyllopachyceras
Subgenus Neophylloceras
Species Phylloceras (Neophylloceras) surya
Species Phyllopachyceras forbesianum
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Ordo Ammonoidea
Familia Phylloceratidae
Subfamilia Phylloceratinae
Genus Phylloceras
Subgenus Neophylloceras
Species Phylloceras (Neophylloceras) surya
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| Synonym list: |
FATMI & Kennedy (1999):
Ward & Kennedy (1993):
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| Was used in synonym list of: |
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| Stratigraphy - relative ages: |
upper Maastrichtian - lower Maastrichtian: Ward & Kennedy (1993)
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| 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
Henderson,R.A.. and McNamara,K.J.. (1985):
Maastrichtian non-heteromorph ammonites from the Miria Formation, Western Australia . Palaeontology Vol. 28 p. 35-88
Stinnesbeck,W.. (1986):
Zu den faunistischen und palökologischen Verhältnissen in der Quriquina Formation (Maastrichtium)Zentral-Chiles . Palaeontographica A194((4-6)) p. 99-237
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 (France, Spain) . Memoir (The Paleontological Society), Journal of Paleontology34 (Supplement to Vol. 67)(5) 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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