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

• Main Authors: Vijver, Bart Van De, Zidarova, Ralitsa
• Format: Other/Unknown Material
• Language: unknown
• Published: 2011
• Subjects: Biodiversity; Taxonomy; Chromista; Bacillariophyta; Bacillariophyceae; Naviculales; Naviculaceae; Pinnularia; Pinnularia quesadae; Byers; Byers peninsula; Claro; Livingston Island; Sickle; South Shetland Islands
• Online Access: https://zenodo.org/record/4918053; https://doi.org/10.5281/zenodo.4918053

Pinnularia quesadae Van de Vijver & Zidarova, sp. nov. (Figs 51–56) Valvae lanceolatae marginibus convexis apicibusque potius late rotundatis, non protractis. Crista marginalis cingens valvae. Dimensiones (n=12): longitudo 24.0– 35.5 µm, latitudo 8.7–9.6 µm. Area axialis moderate lata, linearislanceolata, dilatans in aream centralem. Area centralis parva ad paene absens, rectangularis. Fascia abest. Raphe lateralis ramis externis positis in crista axiali leviter elevate, claro discernenda in microscopico photonico. Terminationes proximales unilateraliter deflexae, ad poros centrales deflectae in latere opposite. Fissurae distales unciformes. Crista axialis connexa in apices crista marginali. Striae transapicales latae, paene parallelae ad leviter radiatae, fere aequidistantes omnino, 6–7 in 10 µm. Striae compositae seriebus nonnulis pororum parvorum, individualiter tectorum. Valves lanceolate with convex valve margins and rather broadly rounded, non protracted apices. Marginal raised rim surrounding entire valve. Valve dimensions (n=12): length 24.0– 35.5 µm, width 8.7–9.6 µm. Axial area moderately broad, linear-lanceolate, widening towards central area. Central area small, in some cases almost absent (Fig. 8), rectangular, bordered by 1–2 short striae. Raphe lateral with outer raphe branches curved, located on weakly raised rim, clearly visible in LM. Proximal raphe endings unilaterally deflected, pore-like, near pores weakly turned to other side. Distal fissures sickle-shaped. Axial rim connected near apices, marginal rim with raphe fissures continuing on marginal rim (Fig. 56). Transapical striae broad, almost parallel to weakly radiate, nearly equidistant throughout entire valve, 6–7 in 10 µm. Striae composed of several rows of small pores, obscured individually by outer covering. Type:— Byers Peninsula, Livingston Island, South Shetland Islands, sample BY67, Leg. B. Van de Vijver, coll. date 18/01/2009, slide no. BR-4237 (holotype BR), slide PLP-187 (isotype University of Antwerp, Belgium), slide ...