Luticola evkae Kopalova 2011, sp. nov.

• Main Authors: Kopalová, Kateŕina, Nedbalová, Linda, Haan, Myriam De, Vijver, Bart Van De
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Chromista; Bacillariophyta; Bacillariophyceae; Naviculales; Diadesmidaceae; Luticola; Luticola evkae; Antarc*; Antarctica; James Ross Island; Ross Island
• Online Access: https://doi.org/10.5281/zenodo.4894481; http://treatment.plazi.org/id/038387FD604FFFD00DE6FA59FBFD8AED

Luticola evkae Kopalová, sp. nov. (Figs 35–50) Valvae ellipticae-lanceolatae marginibus clare convexis apicibusque capitatis, late rotundatis. Valvae minores paene ellipticae. Longitudo 14–22 µm, latitudo 5.4–8.2 µm. Area axialis latissima, lanceolata, leviter dilata in aream centralem. Ad apices, area axialis clare dilata. Area centralis formans staurum paene rectangularem, leviter dilatatum ad margines, marginatumque serie una areolarum minutissimarum. Stigma rotundata, punctiformis solitaria adest inter mediam partem valvae marginesque. Raphe filiformis, recta terminationibus proximalibus unilateraliter deflexis opposita stigma poris centralibus leviter expansis. Fissurae distales curtae, leviter deflexis. Striae transapicales radiatae in parte centrali valvae ad fortiter radiatae ad apices, 16–20 in 10 µm. Areolae rotundae 1–2 per striam terminans in areolam transapicaliter elongatam ad marginem. Type:— ANTARCTICA. James Ross Island, Ulu Peninsula, Vondra II Lake, sample D39, leg. L. Nedbalová , coll. date 19/01/2009, slide no. BR-4242 (holotype BR, Fig. 46 is the encircled holotype specimen), slide PLP-190 (isotype University of Antwerp, Belgium), BRM-ZU8/08 (isotype BRM). Valves elliptic-lanceolate with clearly convex margins and broadly rounded, capitate apices (Figs 35–46). Smaller valves almost elliptical (Fig. 47). Valve length 14–22 µm, valve width 5,4–8,2 µm (n=32). Axial area very broad, lanceolate, slightly widening towards central area (Fig. 48). Towards apices, axial area clearly widened (Fig. 49). Central area forming almost rectangular stauros, slightly widening towards margins, bordered by one series of very small rounded areolae (Fig. 50). One small, solitary, rounded stigma present, halfway between valve centre and margin (Figs 48, 50). Raphe branches filiform, straight with unilaterally deflected proximal endings away from stigma, terminating in weakly expanded central pores (Figs 48, 50). Distal fissures short, slightly deflected (Fig. 49). Transapical striae radiate near valve centre to ...