Journal
MICROPALEONTOLOGY
Volume 68, Issue 3, Pages 257-271Publisher
MICRO PRESS
DOI: 10.47894/mpal.68.3.05
Keywords
Thaerocytheridae; deep-sea; taxonomy; biogeography; species distribution; Cenozoic
Categories
Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [HKU 17300720, HKU 17302518]
- Seed Funding Programme for Basic Research of the University of Hong Kong [202011159122, 201811159076, 201711159057]
- Faculty of Science RAE Improvement Fund of the University of Hong Kong
- University of Hong Kong
- Smithsonian Postdoctoral Fellowship
- Smithsonian Marine Science Network Postdoctoral Fellowship
- Seed Funding of the HKU-TCL Joint Research Centre for Artificial Intelligence
- Ecology and Biodiversity Division Fund, the University of Hong Kong
- Peter Buck Postdoc Fellowship, Smithsonian Institution
- USGS Land Change Program
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Poseidonamicus is a widely studied genus that is commonly found in the deep oceans around the world. It has distinct morphological features and has contributed to various research topics, from evolutionary developmental biology to paleoenvironmental reconstruction. However, taxonomic confusion and limited taxonomic work on deep-sea faunas have led to difficulties in identifying Poseidonamicus species. This paper aims to update taxonomic information on Poseidonamicus species in the Pliocene Quaternary North Atlantic and summarize their paleobiogeographical distribution.
Poseidonamicus is one of the most intensively studied genera among marine fossil ostracods due to its common occurrence in the world deep oceans and its distinctive morphological features. Many studies using Poseidonamicus have contributed to our understanding in a wide range of research topics, from evolutionary developmental biology to paleoenvironmental reconstruction. However, taxonomic confusion with Poseidonamicus species remains widespread because of subtle interspecific differences within this genus and limited taxonomic work on deep-sea faunas. The objectives of this paper are to update taxonomic information about Poseidonamicus species in the Pliocene Quaternary North Atlantic, and to summarize paleobiogeographical distribution of all known Poseidonamicus species. We describe one new species, Poseidonamicus parasculptus n. sp., and present high-resolution scanning electron microscope images of North Atlantic Poseidonamicus major for the first time. Our distributional compilation shows that many Poseidonamicus species are confined to either the Indo-Pacific, the Atlantic, or the Southern Oceans. This information may provide identification guidance for future regional studies.
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