Ammopemphix hemisphaericus sp. nov., a new attached agglutinated foraminifer from the Pleistocene of the Arctic Ocean, and the taxonomic status of the genus Ammopemphix Loeblich, 1952
Abstract The new species Ammopemphix hemisphaericus sp. nov. is described from Pleistocene sediments of the Central Arctic Ocean. The species is a finely agglutinated monothalamous form with hemispherical shape and a terminal aperture located at the top of the test, often occurring in pseudocolonies...
| Published in: | arktos |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Springer Science and Business Media LLC
2018
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1007/s41063-018-0048-9 http://link.springer.com/article/10.1007/s41063-018-0048-9/fulltext.html http://link.springer.com/content/pdf/10.1007/s41063-018-0048-9.pdf |
| Summary: | Abstract The new species Ammopemphix hemisphaericus sp. nov. is described from Pleistocene sediments of the Central Arctic Ocean. The species is a finely agglutinated monothalamous form with hemispherical shape and a terminal aperture located at the top of the test, often occurring in pseudocolonies. A. hemisphaericus sp. nov. attaches itself to inorganic or organic substrates, often growing attached to the inside surfaces of calcareous or agglutinated foraminiferal tests. Pseudocolonies of A. hemisphaericus sp. nov. may also attach themselves to previous generations of Ammopemphix individuals. Based on our study of numerous specimens of Ammopemphix from the Central Arctic Ocean, we propose modifications to the description of the genus. The genus may be pseudocolonial or consist of isolated individuals, and in the case of pseudocolonial forms, individual specimens may be arranged randomly or symmetrically. The genus Ammopemphix is found mostly in polar regions, and is here reported for the first time from the fossil record. |
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