Manumiella seymourensis new species, a stratigraphically significant dinoflagellate cyst from the Maastrichtian of Seymour Island, Antarctica

1999 ◽  
Vol 73 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Rosemary A. Askin
Keyword(s):  
New Species ◽  
Shallow Marine ◽  
Dinoflagellate Cyst ◽  
Morphological Variations ◽  
Palynological Assemblages ◽  
Lower Maastrichtian ◽  
Superficial Similarity ◽  
Almost All ◽  
Shallow Marine Sediments ◽  
Seymour Island

The peridiniacean dinoflagellate cyst Manumiella seymourensis new species described herein characterizes Maastrichtian shallow marine sediments cropping out on Seymour Island, northeastern Antarctic Peninsula. It dominates palynological assemblages throughout the lower Maastrichtian (and possibly uppermost Campanian) to lower upper Maastrichtian part of the López de Bertodano Formation. Despite its superficial similarity to some other southern mid to high paleolatitude Campanian-Maastrichtian species, M. seymourensis represents a discrete, biostratigraphically useful population of peridiniacean cysts. Its morphology and size parameters remain consistent throughout almost all of its stratigraphic range, equated with relatively stable environmental conditions throughout much of the Maastrichtian in the James Ross Basin. Morphological variations, equated with environmental change, are apparent in specimens in the lowermost and uppermost parts of its range.

Convolutidae (Acoela) from the Andaman Sea

Zootaxa ◽  
2008 ◽  
Vol 1824 (1) ◽  
pp. 1 ◽  
Author(s):  
JOHANNES G. ACHATZ
Keyword(s):  
New Species ◽  
Marine Sediments ◽  
Andaman Sea ◽  
Shallow Marine ◽  
Three New Species ◽  
Shallow Marine Sediments

Convolutidae from shallow marine sediments, including three new species, are reported from the Andaman Sea: Amphiscolops sp., Amphiscolops potocani sp. nov., Convoluta schueli sp. nov., Convoluta niphoni sp. nov., and Picola renei.

Eocene microplankton from La Meseta Formation, northern Seymour Island

1992 ◽  
Vol 4 (3) ◽  
pp. 355-362 ◽  
Author(s):  
Christopher D. Cocozza ◽  
Ciara M. Clarke
Keyword(s):  
Late Eocene ◽  
Early Eocene ◽  
Shallow Marine ◽  
Dinoflagellate Cyst ◽  
Two Samples ◽  
Low Diversity ◽  
La Meseta Formation ◽  
Marine System ◽  
Near Shore ◽  
Seymour Island

Twenty two samples collected from the Tertiary La Meseta Formation of Cape Wiman, Seymour Island, Antarctic Peninsula yielded abundant and moderately diverse assemblages of marine palynoflora, dominated by dinoflagellate cysts, together with acritarchs and chlorophyta. The assemblages can be divided into three association: Association 1, characterized by low diversity dinoflagellate assemblage of late Early Eocene age which are dominated by Enigmadinium cylindrifloriferum; Association 2 characterized by more diverse dinoflagellate cyst assemblages, which show a marked decrease in the dominance of E. cylindrifloriferum, and an increase in relative abundance of Areosphaeridium cf. diktyoplokus; and Association 3 which is characterized by a decrease in dinoflagellate cyst diversity up section. Changes in dinoflagellate cyst dominance and diversity throughout the section suggests a gradation from a stressed, shallow marine palaeoenvironment to a more open near-shore, shallow marine system becoming progressively more nearshore up section. The assemblages are no older than late Early Eocene in age, and possibly as young as Mid–Late Eocene.

scholarly journals The genus <i>Boltovskoyella</i> (foraminifera) from Patagonia

1998 ◽  
Vol 17 (2) ◽  
pp. 105-118 ◽  
Author(s):  
Carolina Náñez
Keyword(s):  
New Species ◽  
Marine Sediments ◽  
Late Eocene ◽  
Warm Water ◽  
Shallow Marine ◽  
Shallow Marine Sediments

Abstract. Four species of the genus Boltovskoyella Malumián &amp; Masiuk are recognized in Patagonia, among them, B. paleocenica sp. nov., which is described from Danian shallow marine sediments. Considering that the previous records of Boltovskoyella are from the Middle-Late Eocene, this new species represents the oldest known occurrence of the genus. Boltovskoyella seems to be endemic to Patagonia, shows opportunistic features and prefers temperate-warm water settings.

Two new species of the genus Syngastes (Copepoda, Harpacticoida, Tegastidae) from South Korea

Crustaceana ◽  
2016 ◽  
Vol 89 (4) ◽  
pp. 431-458 ◽  
Author(s):  
Jong Guk Kim ◽  
Jong Guk Kim ◽  
Tae Won Jung ◽  
Jong Guk Kim ◽  
Tae Won Jung ◽  
...  
Keyword(s):  
New Species ◽  
South Korea ◽  
First Record ◽  
Exopodal Segment ◽  
Key To Species ◽  
Korean Waters ◽  
The Family ◽  
Two New Species ◽  
Almost All

Herein two new species of the genusSyngastesMonard, 1924 are described from South Korea, with detailed descriptions and illustrations. Both new copepods,Syngastesmulticavussp. nov. andS. pseudofoveatussp. nov., have two inner setae on the first exopodal segment of P2 and P3.Syngastesmulticavussp. nov. most closely resemblesS. gibbosusBartsch, 1999 reported from Australia, as they both have a five-segmented antennule in the female. However,Syngastesmulticavussp. nov. has a rounded body outline instead of the gibbose outline observed inS. gibbosus.Syngastespseudofoveatussp. nov. resemblesS. foveatusBartsch, 1994 in almost all aspects. However, they differ clearly in the number of setae on the first exopodal segment of P2 and P3. We also provide a key to species of the genusSyngastesworldwide. The present study is the first record of the family Tegastidae in Korean waters.

scholarly journals Ferrimagnetic Iron Sulfide Formation and Methane Venting Across the Paleocene-Eocene Thermal Maximum in Shallow Marine Sediments, Ancient West Siberian Sea

2018 ◽  
Vol 19 (1) ◽  
pp. 21-42 ◽  
Author(s):  
Maxim Rudmin ◽  
Andrew P. Roberts ◽  
Chorng-Shern Horng ◽  
Aleksey Mazurov ◽  
Olesya Savinova ◽  
...  
Keyword(s):  
Marine Sediments ◽  
Iron Sulfide ◽  
Shallow Marine ◽  
Thermal Maximum ◽  
Shallow Marine Sediments

A new species of Odontepyris (Hymenoptera: Bethylidae: Bethylinae) from East Asia

2021 ◽  
Vol 23 (1) ◽  
pp. 9-16
Author(s):  
RYUDAI ITO ◽  
TOSHIHARU MITA
Keyword(s):  
New Species ◽  
South Korea ◽  
East Asia ◽  
Key Words ◽  
Wing Venation ◽  
Palaearctic Species ◽  
Key To Species ◽  
Morphological Variations ◽  
Median Area ◽  
A New Species

Odontepyris costatus sp. nov. is described from Japan and Taiwan. This new species is most similar to O. formosicola Terayama, 1997 known from Cambodia and Taiwan according to the key to the Eastern Palaearctic Odontepyris. O. costatus sp. nov. can be distinguished from the latter by the relatively small eye and the wide metapectal-propodeal disc. It is also similar to O. telortis Lim & Lee, 2009 known from South Korea, but it is distinguished from O. telortis by the imbricate median area of metapostnotum. The morphological variations and diagnostic characters of the Eastern Palaearctic species are briefly discussed and the modified key to species is provided. Key words: new species, Japan, Taiwan, wing venation

scholarly journals Synthetic modeling of shear waves in shallow marine sediments

1987 ◽  
Vol 82 (S1) ◽  
pp. S112-S112 ◽  
Author(s):  
J. A. Carter ◽  
G. H. Sutton ◽  
N. Barstow ◽  
J. I. Ewing
Keyword(s):  
Marine Sediments ◽  
Shear Waves ◽  
Shallow Marine ◽  
Shallow Marine Sediments ◽  
Synthetic Modeling

Nummulites Fayumensis N. Sp. and Nummulites Tenuissimus N. Sp. from Munquar El-rayan, Fayum, Egypt

2018 ◽  
Vol 48 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Safia Al Menoufy ◽  
Mohamed Boukhary
Keyword(s):  
New Species ◽  
Foraminiferal Assemblage ◽  
Shallow Marine ◽  
Marine Facies ◽  
Benthic Foraminiferal Assemblage ◽  
Insight Into ◽  
Important Site

Abstract Nummulites fayumensis n. sp. and Nummulites tenuissimus n. sp. are described from the Munqar El-Rayan Section, Fayum, Egypt. Nummulites tenuissimus belongs to the N. partschi group, while N. fayumensis belongs to the N. gizehensis group, based on diameter and protoconch sizes, septal shape and granulations. Both new species are of Lutetian age, assigned to SBZ14/15, and encountered in shallow-marine facies. Wadi El-Rayan is an important site for vertebrate fossils in Egypt and the abundant larger benthic foraminiferal assemblage provides insight into paleoenvironmental parameters associated with the deposition of Eocene-age rock units of the Munqar El-Rayan Section.

scholarly journals Review of the dinoflagellate cyst <i>Stephanelytron</i> Sarjeant 1961 emend

1999 ◽  
Vol 18 (2) ◽  
pp. 169-182 ◽  
Author(s):  
Bernard Courtinat
Keyword(s):  
New Species ◽  
New Combinations ◽  
Dinoflagellate Cyst ◽  
Peripatric Speciation ◽  
Two New Species ◽  
Endemic Population ◽  
New Evidence ◽  
Upper Callovian ◽  
Posterior Position ◽  
Stratigraphic Range

Abstract. The stratigraphic distribution of the Late Callovian to Early Oxfordian dinoflagellate cyst Stephanelytron Sarjeant 1961 emend provides new evidence pertaining to its evolution. Middle and Upper Callovian times favoured the development of speciations to a short-ranging Stephanelytron community with corona(s) in ventral–posterior position (Stephanelytron brontes, S. callovianum, S. ceto and S. tabulophorum) from eurytopic species with antapical coronas (S. caytonense, S. membranoidium, S. redcliffense and S. scarburghense). The former group of species (except S. tabulophorum) may represent an example of peripatric speciation from an unfavourable mutation. The reduced stratigraphic range gives the appearance of an endemic population. The genus Lagenadinium Piel, 1985 is a junior synonym of Stephanelytron Sarjeant, 1961. A new emendation of Stephanelytron, two new combinations (S. callovianum and S. membranoidium) and two new species (?S. brontes and S. ceto) are proposed.

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