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Chaetomorpha spiralis Okamura 1903: 131

Plants dark green, attached, forming entangled cylindrical filaments, stiff and coiled towards the base. Basal cell curved, thickening from ca 350 µm near rhizoidal attachment to ca 750 µm at distal end. Cells visible to the naked eye, 400-600 µm in diameter but often increasing to more than 1000 µm at the apex of the thallus, about as long as broad proximally but length/width ratio in some specimens increasing to up to 1:2 near apex. Reproductive structures not seen.

Collections, ecology and regional distribution

Recorded from Goukamma to Cape Vidal (29-56). Usually attached to and entangled with other seaweeds in the eulittoral zone.

World distribution: recorded from scattered localities in temperate and tropical seas (Guiry & Guiry 2012).

Type locality: Chiba Prefecture, Japan (Silva et al. 1996).

Note: Leliaert et al. (2001) first recorded this species from South Africa, and provide further information on local records.


Chaetomorpha spiralis, Double Mouth, attached to and entangled with Dichotomaria diessingiana

 Chaetomorpha spiralis, base of filament

 Chaetomorpha spiralis, detail of distal part of filament


References Chaetomorpha spiralis

Guiry, M.D. & Guiry, G.M. 2012. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched July 2013.

Leliaert, F. De Clerck, O., Bolton J.J. & Coppejans, E. 2001. New records of the Chlorophyta from South Africa, with the emphasis on the marine benthic flora of KwaZulu-Natal. South African Journal of Botany 67: 450-459.

Okamura, K. (1903). Contents of the "Algae Japonicae Exsiccatae" Fasciculus II. Botanical Magazine, Tokyo 17: 129-132.

Silva, P.C., Basson, P.W. & Moe, R.L. (1996). Catalogue of the benthic marine algae of the Indian Ocean. University of California Publications in Botany 79: 1-1259.


Cite this record as:

Anderson RJ, Stegenga H, Bolton JJ. 2016. Seaweeds of the South African South Coast.
World Wide Web electronic publication, University of Cape Town,; Accessed on 18 June 2024.