A new species of Gomphosinica (Bacillariophyta) from Lugu Lake, Yunnan Province, SW China Author Cheng, Yu College of Life Science and Technology, Harbin Normal University, Harbin, 150025, China. Author Liu, Yan College of Life Science and Technology, Harbin Normal University, Harbin, 150025, China. yanliuhrb@hotmail.com Author Kociolek, John Patrick Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309, U. S. A. & School of Life Science, Shanxi University, Taiyuan 030006, China Author You, Qingmin College of Life and Environment Science, Shanghai Normal University, Shanghai 200234, China Author Fan, Yawen College of Life Science and Technology, Harbin Normal University, Harbin, 150025, China. yanliuhrb@hotmail.com text Phytotaxa 2018 2018-04-27 348 2 118 124 http://dx.doi.org/10.11646/phytotaxa.348.2.6 journal article 302425 10.11646/phytotaxa.348.2.6 1b1b0ff9-ecdd-46f3-aa41-585b6e811ccf 1179-3163 13709028 Gomphosinica lugunsis Liu, Kociolek, You & Fan sp. nov. ( Figs 1–30 ) Light microscopy ( Figs 1–18 ): Valves narrowly linear-clavate, asymmetrical to the transpical axis. Headpole slightly protracted to not protracted, rounded; valve narrows towards the rounded footpole. Length 10–16 μm, breadth 2.4– 3.7μm ( 25 specimens were measured based on the LM and SEM observations). Axial area linear, narrow, central area small, irregular in shape. Striae radiate in the middle of the valve and alternating in length, becoming convergent near the apices, 13–16/10μm. Stigma indistinct, positioned at the end of a central stria. SEM: The exterior valve face has broad, biseriate striae ( Figs 19, 20 ). Striae are composed of 2 rows of small and round areolae ( Fig. 21 ). The raphe is straight and the proximal raphe ends are slightly dilated, round ( Fig. 22 ). Distal raphe ends nearly straight at both poles ( Figs 21, 24 ). At the headpole, the raphe end is present only on the valve face and it terminates well before the apex ( Fig. 21 ). At the footpole, distal raphe ends extend slightly from the valve face onto the valve mantle, but does not bisect the apical pore field (APF) into two parts ( Fig 24 ). The APF extends across the valve mantle, barely extending to the valve face. The valve mantle at the footpole is more heavily silicified, giving the impression that the porelli of the APF are larger than the areolae ( Fig. 23 ). A stigma located at one side of the central area, has a round opening ( Fig. 22 ). Internally, interstriae are thickened and raised ( Fig. 28 ). Areolar openings are small and round ( Fig. 30 ). Proximal raphe ends recurved to the same direction ( Fig. 29 ). Opening of the stigma is covered by a hooded structure, with several small perforations ( Fig. 29 ). Helictoglossae and pseudosepta are evident at the poles ( Fig. 27 ). The helictoglossae at the headpole are positioned a distance from the terminus of the valve. Septa and pseudosepta present at the apices ( Figs 27, 28 ). Type :— CHINA . Yunnan Province : Lugu Lake. Filamentous algae, Coll. Y. Liu August 2014 ( holotype : HANU ! Individual in slide THHN 2014469, here illustrated as Fig. 2 , isotype : COLO ! JPK material No. 11748, slide No. 613003) Etymology : — This species is named for the lake in which it resides.