Cocconeis kerguelensis P. PetitCocconeis kerguelensis Petit (1889): 116, pl. X, fig. 5 — Cleve (1895): 182; Bourrelly and Manguin (1950); Desikachary (1988): 7, pl. 506, figs. 1–12.DescriptionValves elliptical, disc-like, length 53.1 (32–55) µm, width 47.9 (38–85) µm. SV: axial area relatively narrow, linear-lanceolate. Striae biseriate, 7 (4–6) in (10) µm, 4 striae at margins, slightly parallel at centre and highly radiate at apices. Areolae 16 (10) in 10 µm. RV (not imaged): raphe ends near margin. Axial area very narrow. Central area has transverse, outwardly narrowed fascia. Striae biseriate, 4 in 10 µm. Areolae 10–12 in 10 µm and crossed near margin by narrow blank band.DiagnosisThe description above is based on Cleve (1895) and matches well with the images in Desikachary (1988). Only one image of the sternum valve.NotesCocconeis kerguelensis (P. Petit) Cleve 1895 (as Cocconeis costata var. kerguelensis (P. Petit) Cleve 1895 was reported from the Yaquina Estuary, Oregon, USA by Riznyk (1973: 119, Pl. 5, Figs. 3 and 4). iNaturalist ID: 259379467 (Fig. 10).