Frustulia hengduanensis, Luo & You & Yu & Wang, 2022

Luo, Fen, You, Qingmin, Yu, Pan & Wang, Quanxi, 2022, Frustulia hengduanensis sp. nov. a new diatom (Bacillariophyceae) from Hengduan Mountains, China, Phytotaxa 559 (2), pp. 193-199 : 195-196

publication ID	https://doi.org/ 10.11646/phytotaxa.559.2.8
DOI	https://doi.org/10.5281/zenodo.7021629
persistent identifier	https://treatment.plazi.org/id/03B00857-3302-FFB9-FF52-FA947EC9C57A
treatment provided by	Plazi
scientific name	Frustulia hengduanensis
status	sp. nov.

Treatment

Frustulia hengduanensis sp. nov. Fen Luo & Quanxi Wang (LM Figs 1–14 View FIGURES 1–14 , SEM Figs 15–24 View FIGURES 15–19 View FIGURES 20–24 )

Description:— LM: Valves elliptico-lanceolate or rhomboid with slightly undulate margins. Apices narrowly rounded and moderately protracted. Valve length 43–55 μm, breadth 11–14 μm (n=30). The longitudinal ribs slightly curved. On the valve face, the striation patterns are weakly discernible under LM. Striae absent within the central area, forming a dumbbell-shaped hyaline zone ( Figs 1–14 View FIGURES 1–14 ).

SEM: External view, the striae parallel at the valve center and slightly convergent towards the apices, with 36–40 striae per 10 μm ( Fig. 15 View FIGURES 15–19 ). Striae wavy along the length of the valve ( Figs 15–16 View FIGURES 15–19 ). The valve ends circumradiated by one or two rows of areolae ( Figs 18–19 View FIGURES 15–19 ). Areolae rounded to elliptical at the valve center and more slit-like distally, with 33–36 areolae per 10 μm ( Figs 17–18 View FIGURES 15–19 ). Striae absent within the central area, forming a dumbbell-shaped hyaline zone ( Figs 16–17 View FIGURES 15–19 ). The raphe is filiform, and both the proximal and the terminal raphe ends are T-shaped ( Figs 17–19 View FIGURES 15–19 ). Internal view, areolae have circular to rectangular hymenes ( Fig. 22 View FIGURES 20–24 ). Both the longitudinal ribs and the raphe slightly curved ( Fig. 20 View FIGURES 20–24 ), while both proximal and terminal raphe ends are straight ( Figs 21–24 View FIGURES 20–24 ). At the apices, the longitudinal ribs and the helictoglossae fuse to form a small porte-crayon ( Fig. 24 View FIGURES 20–24 ).

Type: — CHINA. Sichuan Province: Hengduan Mountains , Q.X. Wang, F. Luo and colleagues, August 2015 (holotype SHTU! SC201508131 View Materials , Biology Department Diatom Herbarium, Shanghai Normal University, Shanghai, China = Fig. 2 View FIGURES 1–14 . Isotype YXNU! SC201508131 , Biology Department Diatom Herbarium, Yuxi Normal University, Yuxi City, Yunnan Province, China) .

Etymology: —The species is named for its type locality in the Hengduan Mountains.

Ecology: —All samples were collected from fen peat and a stream fen at elevations of 4160–4750 m asl in freshwater at 5.3–15.3 °C, with pH 6.9–8.1, salinity 0.01–0.08 ‰, and conductivity 20–91 μs∙ cm-1 ..

Distribution: —This species is known from five samples collected in the Haizi Mountain Reserve, Daocheng County, Sichuan Province, China (slide nos. SC201508127, SC201508128, SC201508131, SC201508132, and SC201508137) and from one sample collected in Zuogong County, Tibet (slide no. HDS201810304).