Freboldia carinii sp. nov. from the Middle Triassic Brembana Valley (Esino Limestone, Southern Alps, Italy) – possibly the oldest known holoplanktonic gastropod

2020 ◽  
Vol 298 (1) ◽  
pp. 9-15
Author(s):  
Vittorio Pieroni ◽  
Alexander Nützel
Keyword(s):  
Life Style ◽  
Thin Shell ◽  
Type Species ◽  
Middle Triassic ◽  
Canadian Arctic ◽  
Southern Alps ◽  
Early Jurassic ◽  
Ellesmere Island ◽  
Gastropod Species ◽  
Mass Occurrence

A monospecific mass occurrence of the new gastropod species Freboldia carinii sp. nov. is described from the Middle Triassic Esino Limestone of the Brembana Valley, Southern Alps, Italy. It is the second species assigned to the genus Freboldia that was initially described from the Early Jurassic of Ellesmere Island, Canadian Arctic. This gastropod is unusual in being planispiral and inflated with a nearly bilateral symmetrical shape and in having a very thin shell. Like the Canadian type species of Freboldia, the new Triassic species is interpreted as a possibly holoplanktonic gastropod. If true, it would be the oldest known example of this life style in Gastropoda.

scholarly journals A new Early Jurassic gastropod from Ellesmere Island, Canadian Arctic - an ancient example of holoplanktonic gastropods

2016 ◽  
pp. 229-242 ◽  
Author(s):  
A. Nützel ◽  
S. Schneider ◽  
P. Hülse ◽  
S.R.A. Kelly ◽  
L. Tilley ◽  
...  
Keyword(s):  
Canadian Arctic ◽  
Early Jurassic ◽  
Ellesmere Island

The first Tertiary (Paleocene) marine mollusks from the Eureka Sound Group, Ellesmere Island, Canada

1991 ◽  
Vol 65 (2) ◽  
pp. 242-248 ◽  
Author(s):  
Louie Marincovich ◽  
William J. Zinsmeister
Keyword(s):  
Atlantic Ocean ◽  
South Dakota ◽  
Arctic Ocean ◽  
Canadian Arctic ◽  
Ellesmere Island ◽  
Marine Mollusks ◽  
Molluscan Fauna ◽  
Northern Atlantic ◽  
Northern Alaska ◽  
Northern Atlantic Ocean

The gastropod Drepanochilus pervetus (Stanton) and the bivalve Cytrodaria rutupiensis (Morris) occur in the Mount Moore Formation at Strathcona Fiord, west-central Ellesmere Island, northern Canada. They are the first marine mollusks identified from the Eureka Sound Group of the Canadian arctic islands. These mollusks correlate with Paleocene faunas of the Cannonball Formation of North Dakota and South Dakota, the Prince Creek Formation of northern Alaska, the Barentsburg Formation of Svalbard, and the Thanet and Oldhaven Formations of southeastern England. These occurrences imply that the earliest Tertiary Arctic Ocean molluscan fauna was compositionally distinct from coeval faunas of the northern Atlantic Ocean.

The anisian (middle triassic) carbonate bank of Camorelli (Lombardy, Southern Alps)

Facies ◽  
1989 ◽  
Vol 21 (1) ◽  
pp. 41-56 ◽  
Author(s):  
Maurizio Gaetani ◽  
Marta Gorza
Keyword(s):  
Middle Triassic ◽  
Southern Alps ◽  
Carbonate Bank

scholarly journals Natural and anthropogenic levels of tritium in a Canadian Arctic ice core, Agassiz Ice Cap, Ellesmere Island, and comparison with other radionuclides

2000 ◽  
Vol 46 (152) ◽  
pp. 35-40 ◽  
Author(s):  
Thomas G. Kotzer ◽  
Akira Kudo ◽  
James Zheng ◽  
Wayne Workman
Keyword(s):  
Ice Core ◽  
Canadian Arctic ◽  
Fission Products ◽  
Ellesmere Island ◽  
Anthropogenic Radionuclides ◽  
Ice Caps ◽  
Nuclear Bomb ◽  
Ice Cap ◽  
Nuclear Weapons Testing ◽  
Arctic Ice

AbstractNumerous studies of the ice caps in Greenland and Antarctica have observed accumulations of transuranic radionuclides and fission products from nuclear weapons testing, particularly during the period 1945–75. Recently, the concentrations of radionuclides in the annually deposited surface layers of Agassiz Ice Cap, Ellesmere Island, Canadian Arctic, from 1945 to the present have been measured and have demonstrated a continuous record of deposition of 137Cs and 239,240Pu in ice and snow. In this study, 3He-ingrowth mass spectrometry has been used to measure the low levels of tritium (3H) in some of these samples. Pre-nuclear-bomb tritium levels in ice-core samples were approximately 12 TU in high-latitude meteoric waters and 3–9 TU in mid-latitude meteoric waters. Comparisons of 3H levels and 3H/137Cs + 239,240Pu ratios, which were quite low during the earliest fission-bomb detonations (1946–51) and substantially higher during thermonuclear hydrogen-fusion bomb testing (1952–64), provide a clear indication of the type of nuclear device detonated. This finding accords with the results from other ice-core studies of the distribution of anthropogenic radionuclides from bomb fallout.

NOTES ON SOME ARCTIC COLLEMBOLA

1938 ◽  
Vol 70 (7) ◽  
pp. 151-154 ◽  
Author(s):  
H. G. James
Keyword(s):  
Canadian Arctic ◽  
Ellesmere Island ◽  
The Arctic ◽  
Baffin Island ◽  
Arctic Circle ◽  
Far North ◽  
Southern Shore

The following notes were made from a study of several species of Arctic Coollembola collected by Mr. W. J. Brown, of the Division of Entomology, Ottawa. Mr. Brown accompanied the voyage of the Canadian Arctic Patrol during August and September, 1935. During the trip he was able to collect on the southern shore of Baffin Island, and also well within the Arctic Circle as far north as Ellesmere Island.

scholarly journals Chironomidae (Insecta: Diptera) from the eastern Canadian Arctic and subarctic with descriptions of new life stages, a possible new genus, and new geographical records

2016 ◽  
Vol 48 (2) ◽  
pp. 53 ◽  
Author(s):  
A. Namayandeh ◽  
K.S. Heard ◽  
E.A. Luiker ◽  
J.M. Culp
Keyword(s):  
Benthic Invertebrates ◽  
New Genus ◽  
Canadian Arctic ◽  
Ellesmere Island ◽  
Life Stages ◽  
Larval Form ◽  
International Polar Year ◽  
International Polar ◽  
A New Species ◽  
Eastern Canadian Arctic

Chironomidae larvae constituted the largest proportion of benthic invertebrates collected from 99 rivers stretching from northern Labrador (latitude 58°N) to northern parts of Ellesmere Island (82°N). We describe 92 species of Chironomidae (mainly larval forms) providing new descriptions, a revision for the adult female of <em>Parametriocnemus boreoalpinus</em> Gowin <em>et</em> Thienemann, a possible new genus (larval form only), and 9 larval forms that may represent a new species. In addition, new geographical distribution records are specified for 1 Nearctic species, 6 species in Canada, 10 for Labrador, and 17 for Nunavut. This work contributes to Environment Canada’s International Polar Year output (2007-2009).

HEXATYLUS MULVEYI N. SP. AND DELADENUS DURUS (COBB, 1922) THORNE, 1941 (NEMATODA: NEOTYLENCHIDAE) FROM THE CANADIAN ARCTIC

1964 ◽  
Vol 42 (4) ◽  
pp. 649-653 ◽  
Author(s):  
V. M. Das
Keyword(s):  
Northwest Territories ◽  
Canadian Arctic ◽  
Ellesmere Island ◽  
Single Line

Hexatylus mulveyi n. sp. and Deladenus durus (Cobb, 1922) Thorne, 1941, collected from soil in the Lake Hazen area of Ellesmere Island, Northwest Territories, are figured and described. H. mulveyi differs from H. viviparus Goodey, 1926 in the shape of the tail, the number of incisures, the single line of oocytes in the ovary, and in the vulva having elevated lips.

Sign in / Sign up

Export Citation Format

Share Document