Orthoseira variabilis Cefarelli, Guerrero & Vouilloud, sp. nov. ...

• Main Authors: Cefarelli, Adrián O., Guerrero, José M., Quartino, Liliana, Campana, Gabriela, Vouilloud, Amelia A.
• Format: Text
• Language: unknown
• Published: Zenodo 2024
• Subjects: Biodiversity; Taxonomy; Chromista; Ochrophyta; Bacillariophyceae; Orthoseirales; Orthoseiraceae; Orthoseira; Orthoseira variabilis; Antarc*; Antarctica; King George Island
• Online Access: https://dx.doi.org/10.5281/zenodo.13557120; https://zenodo.org/doi/10.5281/zenodo.13557120

Orthoseira variabilis Cefarelli, Guerrero & Vouilloud sp. nov. Figs 2–94 Description LM (Figs 2–48): Frustules cylindrical in girdle view (Figs 2–14). Valve face flat to slightly convex, gently curving to the mantle, sometimes exhibiting both states in valves of the same frustule (Fig. 7). Valve mantle with a step visible in some specimens (Figs 6, 7). Mantle striae in parallel rows, sometimes dichotomise, continuous beyond the step up to a distinct, hyaline collum (Figs 8, 9, 12, 14). Girdle bands ornamented with large poroids, arranged in one row or more scattered, in irregular rows (Figs 3, 5, 9, 11–14). Valves disc-shaped, usually with scalloped outline when focused on the valve interior (Figs 18, 23–30, 46–48). Central area hyaline and small, occupying approximately ⅕ to ¼ of the total valve diameter, irregularly shaped, with 3–4 carinoportulae. Valve face striae radiating out of central area, uniseriate in the middle and becoming branched near the margin, interspersed with shorter striae that arise ... : Published as part of Cefarelli, Adrián O., Guerrero, José M., Quartino, Liliana, Campana, Gabriela & Vouilloud, Amelia A., 2024, Orthoseira variabilis sp. nov., a new diatom from a snow patch in Potter Cove, King George Island, Antarctica, pp. 37-53 in Phytotaxa 655 (1) on pages 39-47, DOI: 10.11646/phytotaxa.655.1.3, http://zenodo.org/record/13217179 ...