[논문]Taxonomy and distribution of two small negligible diatoms of Plagiogrammopsis minima and Diploneis aestuarii from Northeast Asian tidal flats

Kim, Bongho; Khim, Jong Seong; Park, Jinsoon

doi:10.12651/jsr.2021.10.3.237

Taxonomy and distribution of two small negligible diatoms of Plagiogrammopsis minima and Diploneis aestuarii from Northeast Asian tidal flats 원문보기

Journal of species research, v.10 no.3, 2021년, pp.237 - 245

Kim, Bongho (Ocean Science and Technology School, Korea Maritime and Ocean University) , Khim, Jong Seong (School of Earth and Environmental Sciences & Research Institute of Oceanography, Seoul National University) , Park, Jinsoon (Ocean Science and Technology School, Korea Maritime and Ocean University)

Abstract ▼ AI-Helper

Tidal flats are well developed in and around the Yellow Sea of Northeast Asia, and benthic diatoms are the most important primary producers in corresponding habitats. In the present study, the taxonomy and distribution of small negligible diatom species from Northeast Asian tidal flats are investigated for better understanding of the diversity of Korean marine benthic diatoms. The presence of Plagiogrammopsis minima and Diploneis aestuarii, which may have been ignored and/or misidentified due to their small size, were identified by both means of light microscopy (LM) and scanning electron microscopy (SEM). Plagiogrammopsis minima has never been reported from Korea before the present study, while Diploneis aestuarii was only once mentioned without any photographic information. Accordingly, we provide the morphological characteristics of the two species in detail with LM and SEM observation. Information on the regional distribution of the two species is also provided. Results of the present study contribute to the better understanding of the biodiversity of the Korean marine benthic diatoms.

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표/그림 (6)

그림 Fig. 1. The distribution of Plagiogrammopsis minima and Diploneis aestuarii in the Northeast Asia.
그림 Fig. 2. Light microscope (LM) photographs of Plagiogrammopsis minima: A-D and G-J. Size range in valve view; E, F and K, L. Size range in girdle view. Scale bar=10 μm.
표 Table 1. List of sampling stations from the Northeast Asian tidal flats.
그림 Fig. 3. Scanning electron microscope (SEM) photographs of Plagiogrammopsis minima from A-D (Minami-arao, Japan), E, F (Nakdong, Busan, Korea): A. Entire view of the girdle. Arrow indicates row of the short spines on the valve face. Large arrowhead indicates girdle bands ornamented by a row of poroids; B. External view of the valve face with girdle bands. Right arrow indicates pseudoseptum extends from margin to margin in the central fascia. Left arrow indicates the cribrum occlusion; C. External view of the whole valve. Large arrowheads indicate the two ocelluli which are twisted to opposite directions along the valve axis. Arrow indicates the cribrum occlusion; D. Internal view of the whole valve. Large arrowheads indicate the two ocelluli which are twisted to opposite directions at valve apex. Arrow indicates internal view of the cribrum occlusion located outside of the areolae; E. Right arrow indicates the pseudosptum while left arrow indicates external aperture of the rimoportula; F. Right arrow indicates the pseudosptum while left arrow indicates a rimoportula.
그림 Fig. 4. Light microscope (LM) photographs of Diploneis aestuarii: A-N. Size range in valve view. Scale bar=10 μm.
그림 Fig. 5. Scanning electron microscope (SEM) photographs of Diploneis aestuarii: A. External view of the whole valve; B. Arrow indicates central nodule with four areolae. Large Arrowhead indicates central raphe endings which are bent to the opposite direction; C, D. Large arrowhead indicates C-shaped foramen areolae. Arrows indicate terminal raphe endings which are bent to the same direction; E. Internal view of the whole valve; F. Arrow notes central raphe endings; G, H. Large arrowhead indicates rounded perforations of cribrum. Arrows indicate internal terminal fissures.

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