Rhabdonema arcuatum (Lyngbye) Kützing 1844

Girdle view of the marine diatom Rhabdonema arcuatum (Lyngbye) Kützing 1844. Class Bacillariophyceae
Subclass Fragilariophycidae
Order Rhabdonematales
Family Rhabdonemataceae (Guiry and Guiry 2021).

A colonial diatom that forms flat ribbon-like bands, most often seen in girdle view. In valve view, elliptical to linear-lanceolate cells. In girdle view, quadrangular with distinctive rounded corners (apical pore fields-ocelli). Girdle bands complex and composed of numerous segments bearing septate partitions. Round (punctate) pores and thickened ribs (costae) on the girdle bands (Hendey 1964, Al-Yamani & Suburova 2019).

Methods: Plankton tow in Trincomali Channel, Spanish Hills Wharf, Galiano Island, B.C. Canada, November 11, 2006.

References:

Al-Yamani, F.Y. & Suburova, M.A. (2019). Marine phytoplankton of Kuwait's waters Volume II. Diatoms. pp. [1]-336, 161 pls. Kuwait: Kuwait Institute for Scientific Research.

Chambers, P. (2019). Diatoms of the Channel Islands. Society Jerslaise. Great Britian. p. 38-2.

Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 15 June 2021.

Hendey, N.I. (1964). An introductory account of the smaller algae of British coastal waters. Part V. Bacillariophyceae (diatoms). Her Majesty’s Stationary Office, London. pp. 171-172. Plate XXXV, fig. 10.

Round, F.E. Crawford, R.M. and Mann, D.G. (1990). The Diatoms, Biology & Morphology of the Genera, pp. 430-431. Cambridge University Press, Cambridge, UK.