Saghalinites wrighti Birkelund 1965 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 . |
Notice: This catalogue page may contain unedited data.
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Species Saghalinites wrighti Birkelund 1965 |
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Diagnosis / Definition: |
Ward & Kennedy (1993):
Description. -
Coiling very evolute, with umbilicus comprising
just under half diameter, whorls overlapping slightly and
expanding slowly. Umbilical wall flattened and inclined outward,
flanks broadly rounded, ventrolateral shoulders narrowly
rounded, venter broad, feebly concave with weak rounded ridges
at juncture of ventrolateral shoulder and venter. Ornament consists
of strongly prorsiradiate growth lines and striae, straight
on inner and middle flank, but flexed back and concave on outer
flank and ventrolateral shoulder. Feeble siphonal ridge may be
present. |
Discussion / Comments: |
Ward & Kennedy (1993):
Type.-
Holotype is No. 9747 in the collections of the Mineralogical
Museum, Copenhagen, the original of Birkelund, 1965,
P1. 2, fig. 15, text-fig. 19, from Maastrichtian concretions in
Paleocene conglomerate at Nugssuaq, west Greenland.
Discussion. -
Saghalinites wrighti, topotypes of which are
shown in Figure 20.1-20.3, is closest to S. cala (Forbes, 1846)
(see Kennedy and Klinger, 1977b, p. 168, text-figs. 10A, B; 1 1 A,
B; 12D-G; 13A, B, E-K, ?C-D; 14A-F; 1 5A-F) from which it
differs in having straight rather than flexuous constrictions.
Saghalinites n. sp. of Birkelund (1979, p. 53; 1982, p. 15) from
the upper Maastrichtian of Kunrade, the Netherlands, and north
Jylland, Denmark, is much more evolute, with much stronger
constrictions.
Occurrence.-
In the Biscay sections this taxon ranges from
the middle of Member I (lower Maastrichtian) to near the top
of Member IV (upper Maastrichtian). A fragment of an ammonite
possibly referable to this taxon has been collected from
the last meter of Member V at Hendaye. Birkelund (1982, p.
16) stated that the Greenland, north German, and Danish occurrences
are all around the lower-upper Maastrichtian bound ary in a boreal sense. The species also occurs in the lower Maastrichtian
of Steiermark, Austria. |
Systematics: |
38 Ordo Ammonoidea
Subordo Lytoceratina
Superfamilia Tetragonitaceae
Familia Tetragonitidae
Genus Saghalinites
Species Saghalinites wrighti
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Synonym list: |
Ward & Kennedy (1993):
1965 Saghalinites wrighti Birkelund. - BIRKELUND : p.30 pl. 1, fig. 5;
pl. 2, fig. 1-5;
pl. 3, fig. 1;
text-fig. 14-25
1986 Saghalinites wrighti Birkelund. - Kennedy & Summesberger : p.186 pl. 1, fig. 4, 5, 7;
pl. 3, fig. 4;
text-fig. 3 (with full synonymy)
1993 Saghalinites wrighti Birkelund. - Ward & Kennedy : p. 20, 22 fig. 19.3, 19.4, 19.8, 19.12, 20.1-20.3
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Stratigraphy - relative ages: |
upper Maastrichtian - lower Maastrichtian: Ward & Kennedy (1993)
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Specimen: |
Collection of the Mineralogical Museum - Copenhagen, Inventory number: No. 9747
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References: |
BIRKELUND,T.. (1965): Ammonites from the Upper Cretaceous of West Greenland . Meddeleser om Gronland Vol. 179 p. 1-192
Kennedy,W.J.. and Summesberger,H.. (1986): Lower Maastrichtian ammonites from Neuberg, Steirmark, Austria: . Beiträge zur Paläontologie von Österreich Vol. 12 p. 181–242
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
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