Family: Chaetocerotaceae Ralfs in Pritchard
Genus: Chaetoceros Ehrenberg
Scientific name: Chaetoceros pseudocurvisetus Mangin
Pavillard, 1925: p. 52, Fig. 83; Hustedt, 1930: p. 741, Fig.427; Allen and Cupp, 1935: p. 141, Fig. 73; Cupp, 1943:p. 139, Fig. 94; Hendey, 1964: p. 134, Pl. XVIII: 1 .
Cells compressed, 13-19 µm broad. Apertures lenticular,slightly fused at insertion of setae. Four protuberances appear on each valve connected with similar knobs on adjacent cells. Valve face rectangular with bent angles;setae joined at insertion. Valve mantle high, without definite notch at junction with girdle band; girdle zone small in resting cells. Onechromatophore per cell. In general appearance setae similar to those of C. curvisetus (Cupp,1943).
Apical axis 10-13 µm; pervalvar axis 18-19 µm.
Neritic, tropical and subtropical species.
Sites of occurrence in RSA:
In Winter 2006 Cruise, this species occurred at various sites (refer sites map), usually in small numbers; however, it was very abundant at some localities; maximum abundance (1.4*10^5cells/l) was associated with Kuwaiti waters in the northwestern part of the inner RSA (St. 1). Ithas been previously reported from Kuwaiti waters of the inner RSA (Al-Yamani et al., 2004; AlKandari et al., 2009).