Cephalogullmia caudata gen. nov., sp. nov. (Rhizaria, Foraminifera), a monothalamous foraminifera from the Sea of Japan
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Abstract
We describe a new species and genus of soft-walled monothalamous foraminifera from the Sea of Japan. The material was sampled off the Primorsky shelf during the 64th cruise of the RV “Akademik Oparin” (17 June to 08 July, 2021). Bottom sediments were sampled at 17 stations in a depth range of 0.3–86 m. The species described here was found at depths of 13 and 86 m. An elongated organic-walled test of Cephalogullmia caudata sp. nov. has an inflated anterior (apertural) part which gradually narrows towards the adapertural end. The length varies 600 to 1,180 μm; the width at the widest part (the ‘head’) is 50 to 135 μm, and at the narrowest part, it is 10 to 20 μm. A single apertural structure (10–28 µm in diameter) is located at the widest end of the test. The apertural structure is slightly elevated; in some specimens, it resembles a nipple. The nucleus is visible only in some specimens; its size is from 16 × 12 μm to 30 × 15 μm. The comparative analysis shows that the new genus Cephalogullmia differs from Micrometula Nyholm, 1952 in the shape of the test: it has more rounded and inflated apertural end, compared to that of the slender conical test of Micrometula. The new genus differs from Cylindrogullmia Nyholm, 1974 in the shape of the test as well: in the latter one, it is cylindrical. It also differs from another organic-walled monothalamid with the elongated test, Bowseria Sinniger et al., 2008, in having a darker protoplasm and a narrowed (tail-shaped) adapertural end.
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References
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