Cocconeis imperatrix A. Schmidt

• 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; Cocconeis; Cocconeis imperatrix; Antarc*; Antarctica; King George Island
• Online Access: https://doi.org/10.5281/zenodo.11094449; http://treatment.plazi.org/id/03C487C5430C7379FCCDFA6372E59DE9

Cocconeis imperatrix A. Schmidt (Figure 52) Literature: (Al-Handal and Wulff 2008b, p. 426, figs. 46– 49; Manguin 1960, p. 305, figs. 358, 359; Riaux-Gobin and Romero 2003, p. 28, figs. 29–31, pl. 20, figs. 1–7, pl. 21, figs. 1–8). Description: Length 38–65 µm, width 25–44 µm, striae (raphe valve) 3–4 in 10 µm. Remarks: Scott and Thomas (2005) considered Cocconeis imperatrix as a synonym of Cocconeis fasciolata . Studying valve structure of both taxa in Potter Cove revealed noticeable variation between them so that it can be considered to be a separate entity (Al-Handal and Wulff 2008b). Ecology and distribution: A marine species mostly reported from Antarctica. Common in Potter Cove. Cocconeis matsii (Al-Handal, Riaux-Gobin et Wulff) Riaux-Gobin, Compère, Romero et Williams (Figure 53) Literature: (Al-Handal et al. 2010, p. 6, figs. 13–18, 25–34 as C. pinnata var. matsii ). Description: Length 10–13 µm, width 5–7 µm, striae (rapheless valve) 7–8 in 10 µm. Remarks: This species was originally described from Potter Cove as C. pinnata var matsii but was considered a distinct species based on stria and areola density and structure (Riaux-Gobin et al. 2003). These authors, however, did not provide images for specimens but rather established a new combination. Ecology and distribution: The species has not been reported outside its type locality in Potter Cove. Frequent in the material examined. Published as part of Al-Handal, Adil Y., Torstensson, Anders & Wulff, Angela, 2022, Revisiting Potter Cove, King George Island, Antarctica, 12 years later: new observations of marine benthic diatoms, pp. 81-103 in Botanica Marina (Warsaw, Poland) (Warsaw, Poland) 65 (2) on pages 91-92, DOI:10.1515/bot-2021-0066, http://zenodo.org/record/11000147