Pinnularia australoschoenfelderi Zidarova & Kopalová & Vijver 2012, sp. nov.

• Main Authors: Zidarova, Ralitsa, Kopalová, Kateŕina, Vijver, Bart Van De
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2012
• Subjects: Biodiversity; Taxonomy; Chromista; Bacillariophyta; Bacillariophyceae; Naviculales; Naviculaceae; Pinnularia; Pinnularia australoschoenfelderi; Livingston Island; South Shetland Islands
• Online Access: https://doi.org/10.5281/zenodo.4929563; http://treatment.plazi.org/id/03F2686FFF93925A42EAFBA3FDF697F9

Pinnularia australoschoenfelderi sp. nov. (Figs 48–74) Valvae lineares ad lineares-lanceolatae, marginibus parallellis ad leviter convexis in media parte valvae, graduatim decrescentibus in apices non-protractos, anguste rotundatos. Longitudo 25–38 µm, latitudo 4.6–6.0 µm. Area axialis angusta, linearis, aliquando dilatans in aream centralem. Area centralis formans fasciam latam, cuneiformem ad rectangularem. Raphe filiformis, ramis leviter curvatis. Terminationes raphis proximales extensae ultra strias centrales, deflexae cum poris parvis expansis. Fissurae raphis distales paene non discernandae in LM,similes signo interrogationis. Striae radiatae in media parte valvae, convergentes ad apices, 10–12 in 10 µm. Lineae speciosae longitudinales nullae. Valves linear to linear-lanceolate with parallel to weakly convex margins, gradually narrowing towards the non-protracted, narrowly rounded apices. Valve dimensions (n=25): length 25–38 µm, width 4.6–6.0 µm. Axial area narrow, linear, occasionally widening towards the central area. Central area forming a large, bowtie-shaped to rectangular fascia. Raphe filiform with weakly curved raphe branches. Proximal raphe endings extending well beyond the last central striae, deflected and terminating in small, expanded raphe pores. Distal raphe fissures difficult to resolve in LM,?-shaped. Striae radiate near the valve middle, becoming convergent towards the apices, 10–12 in 10 µm. Longitudinal lines absent. Type:— Byers Peninsula, Livingston Island, South Shetland Islands, sample BY068, leg. B. Van de Vijver, coll. date 18/01/2009, slide no. BR-4253 (holotype BR), slide PLP-198 (isotype University of Antwerp, Belgium), slide ZU8/20 (isotype BRM). Habitat:— The type population of Pinnularia australoschoenfelderi was sampled from the sandy bottom of a small pool near the southern beaches on Byers Peninsula, with an almost circumneutral pH (7.2) and a low specific conductance (<100 µS/cm) value. The species was also found on Hurd Peninsula, usually rare but more abundant in ...