Ulnaria sinensis Bing Liu et D.M. Williams, 2017

Liu, Bing, Williams, David M. & Tan, Lin, 2017, Three new species of Ulnaria (Bacillariophyta) from the Wuling Mountains Area, China, Phytotaxa 306 (4), pp. 241-258 : 243-248

publication ID

https://doi.org/ 10.11646/phytotaxa.306.4.1

DOI

https://doi.org/10.5281/zenodo.13695818

persistent identifier

https://treatment.plazi.org/id/03B587FA-7B68-FFA8-FF30-FCF93EF5F8FE

treatment provided by

Felipe (2024-09-05 18:47:35, last updated 2024-09-05 18:57:34)

scientific name

Ulnaria sinensis Bing Liu et D.M. Williams
status

sp. nov.

Ulnaria sinensis Bing Liu et D.M. Williams , sp. nov. ( Figs 2–29)

LM: Cells forming colonies in bands; frustules connected by interlocking, linking spines ( Fig. 2). Frustules rectangular in girdle view ( Figs 2, 3); during development cells lack regular structure and hence lack rectangular outline ( Fig. 3). Valves linear, with parallel margins, narrowing at both poles ( Figs 4–10), which become protracted to rostrate ( Figs 4–8, 10). Transapical axis 6–8 μm, apical axis 296–512 μm (n = 50), length-to-breadth ratio ca. 49–64. Sternum central, distinctive, regular, extending length of valve ( Figs 4–10). Striae broad, mostly parallel, radiating only at poles; 8–9 in 10 μm. With respect to the sternum, striae pattern relatively uniform, most situated opposite one another, others not so ( Figs 8–10, arrows). A single rimoportula present at each pole ( Figs 8, 10). Central area absent ( Figs 4–7, 9).

SEM: Frustules forming colonies in bands, through interlocking linking spines ( Figs 11–13, Figs 20–22). Frustule composed of epivalve and hypovalve, each with a set of closed girdle bands. For epivalve there is a valvocopula (B1) and three copulae (B2–B4) ( Figs 11– 13). For hypovalve there is a valvocopula (B6) and a copula (B5) ( Figs 11–13). Each band possessing a single row of poroids ( Figs 11–13) that bisects pars interior and exterior, located at mid-line of each girdle band ( Figs 20, 23). Valve face meets mantle at obtuse angle ( Figs 16–22). Valves with uniseriate striae situated opposite each other, equidistant from sternum, radiating at poles, continuing onto valve mantle ( Figs 16–20). Vimines form 5–8 apically elongated areolae either side of the valve sternum, 4–6 on the valve mantle ( Figs 20–22). Often, a tiny poroid present in the terminal mantle areola ( Figs 20–22, arrows). Each areola externally covered by velum ( Fig. 19). A single rimoportula present at each pole, each a pair of simple extended lips, aligned within a shortened radiate stria ( Figs 16, 18–20). Two horn-like outgrowths located on the surface of each ocellulimbus, the latter composed of c. 30 pervalvar and 7–14 transapical rows of porelli ( Figs 19–22). Linking spines spatulate, situated at valve/mantle junction, each spine extending from a virga ( Figs 20–22). Spines attach valves face to face by interlocking ( Figs 11–13, 20–22). Mantle plaques absent ( Figs 20–22). Internally, valves possessing parallel margins, with rostrate poles; striae uniseriate almost opposite each other, composed of 5–8 slightly apically elongated areolae that radiate at apices ( Figs 26, 29). Rimoportulae prominent, possessing bilabiate structure, lying almost parallel to the adjacent stria ( Figs 27, 29).

Type: — CHINA. Guizhou: Fanjing Mountain National Nature Reserve, the course of Heiwang river, near Mile Daochang , 27°49’10” N, 108°46’18” E, 494 m a.s.l., Bing Liu , 31 st December 2015, (holotype BM! 101838, illustrated in Figs 4, 8–10, from the same specimen; isotype JIU! G201604 About JIU , illustrated in Fig. 5, indicated on the slide) GoogleMaps .

Etymology: —Named after China, where the species is found.

Ecology: —The following environmental parameters were measured in the field. Electric conductivity was 54.9 ± 1.4 μS/cm, pH was 7.6 ± 0.1, and water temperature was10.4 ± 0.1 °C. Since the diatom sample was scraped off the surfaces of stones and the water electric conductivity is below 100 μS/cm, Ulnaria sinensis can be considered an epilithic diatom characteristic of poor electrolyte content freshwaters.

BM

Bristol Museum

JIU

Jishou University