Pinnularia perlanceolata Van de Vijver & Zidarova 2011, sp. nov.

• Main Authors: Vijver, Bart Van De, Zidarova, Ralitsa
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Chromista; Bacillariophyta; Bacillariophyceae; Naviculales; Naviculaceae; Pinnularia; Pinnularia perlanceolata; Livingston Island; South Shetland Islands
• Online Access: https://doi.org/10.5281/zenodo.4894394; http://treatment.plazi.org/id/03DEC91DFFAE1537FF2BB1FBFBB9FA6E

Pinnularia perlanceolata Van de Vijver & Zidarova, sp. nov. (Figs 45–50) Valvae elliptico-lanceolatae marginibus calro convexis, apicibusque non-protractis, late rotundatis. Dimensiones (n=17): longitudo 23.8–35.5 µm, latitudo 10.6–12.8 µm. Area axialis moderate angusta, linearis, dilatans ad aream centralem. Area centralis parva ad moderate lata, rotundata ad rectangularis. Fascia abest. Raphe fere recta ad leviter curvata, terminationibus raphis proximalibus rectis ad unilateraliter leviter deflexis, poriformibus. Fissurae distales unciformes. Striae transapicales latae, distincte radiatae ad aream centralem, minus radiatae in apices, 5–6 in 10 µm. Valves elliptic-lanceolate to rhombic-lanceolate with clearly convex valve margins and rather broadly rounded, non protracted but clearly narrowing apices. Valve dimensions (n=17): length 23.8–35.5 µm, width 10.6–12.8 µm. Axial area (moderately) narrow, linear, widening towards central area. Central area small to moderately large, rounded to rectangular, bordered by 1–2 short striae. Raphe almost straight to weakly curved, with straight to unilaterally slightly deflected proximal, pore-like endings (Fig. 50). Distal fissures sickle-shaped. Transapical striae broad, distant, clearly radiate near central area, becoming slightly less radiate near apices, 5–6 in 10 µm. Longitudinal lines absent. Type :— Byers Peninsula, Livingston Island, South Shetland Islands, sample BY67, leg. B. Van de Vijver, coll. date 18/01/2009, slide no. BR-4236 (holotype BR), slide PLP-186 (isotype University of Antwerp, Belgium), BRM-7/99 (isotype BRM). Habitat and Distribution :— Pinnularia perlanceolata has only been found on Livingston Island. It is a very rare species and so far only observed in one large (70 m ²), circumneutral (pH 7.3) shallow pool near the southern beaches of Byers Peninsula surrounded by fellfields and moss vegetations, growing into the water. The sediment of the pool was very fine and mainly composed of algal mats. This was the source of sample BY67. ...