Nucicla umbiliphora gen. et sp. nov.; a Quaternary peridinioid dinoflagellate cyst from the Antarctic margin

Online Access: Get full text
doi: 10.1080/01916122.2018.1430070
Author(s): Hartman, Julian D.; Sangiorgi, Francesca; Bijl, Peter K.; Versteegh, Gerard J. M.
Author Affiliation(s): Primary:
Utrecht University, Marine Palynology and Paleoceanography Group, Utrecht, Netherlands
Alfred-Wegener-Institut, Germany
Volume Title: Palynology
Source: Palynology, 43(1), p.94-103. Publisher: American Association of Stratigraphic Palynologists, Dallas, TX, United States. ISSN: 0191-6122
Note: In English. 37 refs.; illus., incl. 2 plates, 1 table, sketch map
Summary: In the southern high latitudes, dinoflagellate cysts are an important microfossil group for both biostratigraphic and palaeoenvironmental interpretations purposes. In light of this, the peridinioid dinoflagellate cyst Nucicla umbiliphora gen. et sp. nov. from the Antarctic margin is formally described. Nucicla is dorsoventrally compressed, has a rounded pentagonal outline in dorso-ventral view, an epicyst that is only half as high as the hypocyst, an unusual archaeopyle formed by the loss of the three anterior intercalary plates, and a posterior sulcal plate that is positioned at the antapex. The species N. umbiliphora is characterised by a scabrate cyst wall and possesses undulated and/or crenulated folds/ridges. It has been so far exclusively found in Quaternary sediments obtained from the East Antarctic continental shelf and the Ross Sea. Although the dinoflagellate producing this cyst is as yet unknown, its brown color and the lack of autofluorescence suggest that the motile cell is likely a heterotrophic Protoperidinium species. As such, N. umbiliphora might benefit from the phytoplankton blooms occurring close to the Antarctic margin after seasonal sea-ice retreat.
Year of Publication: 2019
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 09 Paleontology, Paleobotany; Antarctica; Cenozoic; Dinoflagellata; East Antarctica; Electron microscopy data; Expedition 318; Holocene; IODP Site U1357; Integrated Ocean Drilling Program; Mac Robertson Land; Marine environment; Microfossils; Morphology; New taxa; Nucicla umbiliphora; Paleoecology; Paleoenvironment; Palynomorphs; Peridiniales; Protoperidiniaceae; Quaternary; SEM data; Shelf environment; Southern Ocean; Taxonomy
Coordinates: S662448 S662448 E1402531 E1402531
S764200 S764200 E1690500 E1690500
S665300 S661100 E1203100 E1181400
S740900 S740900 E1660500 E1660500
Record ID: 2019014752
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, American Association of Stratigraphic Palynologists, Reference includes data from GeoScienceWorld, Alexandria, VA, United States