Pinnularia subcarteri 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 subcarteri; Livingston Island; South Shetland Islands
• Online Access: https://doi.org/10.5281/zenodo.4929557; http://treatment.plazi.org/id/03F2686FFF90925842EBF8F0FDA39297

Pinnularia subcarteri sp. nov. (Figs 20–28) Valvae anguste lanceolatae, margines leviter convexae in media parte valvae, graduatim decrescentes in apices capitatos, anguste rotundatos. Longitudo 17–30 µm, latitudo 3.0– 4.5 µm. Area axialis angustissima, linearis, dilatans in aream centralem. Area centralis formans fasciam latam, cuneiformem. Raphe filiformis, ramis rectis, terminationibus raphis proximalibus unilateraliter leviter deflexis cum poris guttiformibus expansis, relative distantibus inter se. Terminationes raphis distales paene non discernandae in LM, falcatae. Striae fortiter radiatae in media parte valvae, abrupte convergentes ad apices, 12–14 in 10 µm. Lineae speciosae longitudinales nullae. Valves narrowly lanceolate, slightly convex in the middle and gradually narrowing towards the capitate, narrowly rounded valve apices. Valve dimensions (n=19): length 17–30 µm, width 3.0– 4.5 µm. Axial area very narrow, widening towards the central area. Central area forming a broad, wedge-shaped fascia. Raphe filiform, straight with only slightly deflected central endings terminating in clearly droplike expanded, relatively distant, central pores. Terminal fissures almost indistinct in LM, probably sickle-shaped (Figs 22– 23). Striae strongly radiate in the middle, becoming abruptly strongly convergent at the apices, 12–14 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-4252 (holotype BR), slide PLP-197 (isotype University of Antwerp, Belgium), slide ZU8/28 (isotype BRM). Habitat:— Pinnularia subcarteri is a rare species on Livingston Island and was found in a few samples. The type population was sampled from the sandy bottom of a small pool near the southern beaches, with an almost circumneutral pH (7.2) and a low specific conductance (<100 µS/cm) value. The species was also observed in the surrounding moss vegetation. On Hurd Peninsula, the species was occasionally observed ...