A late Paleocene fauna from shallow-water chemosynthesis-based ecosystems, Spitsbergen, Svalbard
Author
Hryniewicz, Krzysztof
Author
Amano, Kazutaka
Author
Bitner, Maria Aleksandra
Author
Hagström, Jonas
Author
Kiel, Steffen
Author
Klompmaker, Adiël A.
Author
Mörs, Thomas
Author
Robins, Cristina M.
Author
Kaim, Andrzej
text
Acta Palaeontologica Polonica
2019
2019-02-13
64
1
101
141
http://dx.doi.org/10.4202/app.00554.2018
journal article
10.4202/app.00554.2018
1732-2421
10980900
Genus
Globularia
Swainson, 1840
Type
species
:
Ampullaria sigaretina
Lamarck, 1804
;
Eocene
,
France
.
Globularia isfjordensis
(
Vonderbank, 1970
)
Fig. 5
.
1925
Natica
spec. 1
;
Hägg 1925: 45
, pl. 3: 2.
1925
Natica
spec. 2
;
Hägg 1925: 45
, pl. 3: 3.
1925
Natica
spec. 3
;
Hägg 1925: 45
, pl. 3: 4.
1927
Natica
sp.
;
Gripp 1927: 32
, pl. 6: 11.
1970
Ampullonatica isfjordensis
n. sp.
;
Vonderbank 1970: 87
, pl. 8: 1–6.
2016 “Naticiform” gastropod sp.;
Hryniewicz et al. 2016
: table 1, fig. 12G.
Material
.—Ten specimens, poorly to immoderately well preserved shells, including the
holotype
(
GPIBo
111) from
Vonderbank’s (1970)
collection (four figured
GPIBo
110– 113) and
four specimens
from
Hägg’s (1925)
collection (one figured NRM-PZ Mo 149179); from the upper Paleocene, Basilika Formation, Fossildalen, locality
500 m
from Hollendarbukta, Spitsbergen,
Svalbard
.
Measurements
.—The
holotype
(
GPIBo
111): H,
12.5 mm
; W,
10.5 mm
. NRM-PZ Mo 149179: H,
22 mm
; W,
19 mm
.
Original diagnosis
(from
Vonderbank 1970
).—Eine Art der Gattung
Ampullonatica
mit flach eingesenkten Nähten, schwach bogenförmigen Parietalrand und ± offenem Nabel. [A species of the genus
Ampullonatica
with weakly incised sutures, slightly arched parietal margin and ± open umbilicus].
Description.
—Protoconch and juvenile teleoconch not preserved. Shell naticiform, thin-shelled with strongly inflated whorls and moderately incised suture. Ornamentation absent apart from enhanced, orthocline to slightly sinusoidal growth lines. Aperture poorly preserved in all available specimens. No umbilicus observed, contrary to statement by
Vonderbank (1970)
. Parietal callus not developed and no other apertural elaborations preserved.
Remarks
.—
Vonderbank (1970)
classified his new species in the naticid genus
Ampullonatica
Sacco, 1890a
, which is invalid due to its
type
species being a nomen nudum. In an older account,
Hägg (1925)
divided the naticiform gastropods from Isfjorden into three species of
Natica
Scopoli,
1777 in
open nomenclature, but provided no description of the species in question.
Gripp (1927)
also left this form as a species of
Natica
in open nomenclature, but compared it to a number of naticiform species currently classified as representatives of
Ampullinidae
(e.g.,
Ampullospira
Harris, 1897
,
Crommium
Cossmann, 1888
,
Amauropsella
Bayle
in
Chelot, 1885
,
Euspirocrommium
Sacco, 1890b
, and
Amauropsis
Mörch, 1857
). We also think that this form is more similar to ampullinids rather than to naticids due to the thin shell, absence of an umbilicus and parietal callus and enhanced growth lines. On the other hand, in molluscan fossils from the studied collection, we noticed several drill holes that could be attributed to predatory gastropods (such as naticids), although another species of predatory gastropod not yet found in Basilika Formation could have been responsible for these holes. Drill holes have been noted previously in fossil cold seep mollusks (
Amano 2003
;
Amano and Jenkins 2007
;
Amano and Kiel 2007
;
Kiel et al. 2008
, 2016). The species identified by
Hägg (1925)
as
Nassa
sp.
(
Fig. 4C
) most likely is a poorly preserved aporrhaid (see above).
Stratigraphic and geographic range
.—Upper Paleocene cold seep carbonates from the Basilika Formation, Fossildalen and locality
500 m
west of Trigonometric point 25, Hollendarbukta, Spitsbergen,
Svalbard
.