Campyloneis frenguellii Riaux-Gobin et Guerrero

• Main Authors: Al-Handal, Adil Y., Torstensson, Anders, Wulff, Angela
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2022
• Subjects: Biodiversity; Taxonomy; Chromista; Ochrophyta; Bacillariophyceae; Achnanthales; Cocconeidaceae; Campyloneis; Campyloneis frenguellii; Antarc*; Antarctica
• Online Access: https://doi.org/10.5281/zenodo.11094443; http://treatment.plazi.org/id/03C487C5430F737BFF71F94777829A37

Campyloneis frenguellii Riaux-Gobin et Guerrero (Figures 56–59, 113, 114) Literature: (Riaux-Gobin and Romero 2003, p. 38, pl. 57, figs. 3–4 as Cocconeis cf. orbicularis Riaux-Gobin et al. 2019, p. 161, figs. 54–59). Description: Length 28–41 µm, width 18–32 µm, striae 3.5– 4 in 10 µm (raphe valve), 2.5– 3 in 10 µm (rapheless valve). Remarks: This species is characterized by its large marginal alveole which encompass tetraseriate striae. On the rapheless valve, another set of alveole is observed between the marginal alveole and the axial area but these do not reach valve center and their number varies from 2 to 5, their size decreases towards the center. The observed specimens were larger than those reported in the literature cited (17– 18 µm long, 11–13 µm wide). Ecology and distribution: A marine cold-water species. It is very rarely mentioned in the literature and have only been reported from its type locality in Antarctica and from southern Argentina (Romero 1995). Frequent in the present samples from Potter Cove but were not encountered in the collections made during 2003–2006 from the same locality (Al-Handal and Wulff 2008a,b). Cocconeis antiqua Tempère et Brun (Figures 60, 61) Literature: (Al-Handal and Wulff 2008b, p. 426, figs. 28–29, 35–36 [as Cocconeis schuettii van Heurck 1909]; Scott and Thomas 2005, p. 127, fig. 2.69a–d). Description: Length 47–72 µm, width 35–47 µm, striae 14– 16 on raphe valve, 24–26 on rapheless valve. Remarks: The taxonomic position of Cocconeis antiqua has been discussed and revised by Romero (2011) where several taxa previously described by Van Heurck were considered as synonyms of this species. These include C. gautierii var. gautierii , C. gautierii var. inornata , C. litigiosa , C. schuettii var. schuettii , and C. schuettii var. minor Van Heurck. Ecology and distribution: Cocconeis antiqua does not seem to have been found outside Antarctica since its description in 1909 by Van Heurck (Van Heurck 1909). Frequent in all samples examined from Potter Cove. Published as ...