Family: Rhizosoleniaceae De Toni
Genus: Proboscia Sundström
Scientific name: Proboscia indica (H. Péragallo) Hernandez-Becerril
Rhizosolenia indica H. Péragallo; Rhizosolenia alata form indica (H. Péragallo) Ostenfeld
Pavillard, 1925: p. 27, Fig. 39 (as Rhizosolenia indica); Hustedt, 1930: p.601, Fig. 346 (as Rhizosolenia alata f. indica); Allen and Cupp, 1935: p.130, Fig. 45 (as Rhizosolenia alata f. indica); Cupp, 1943: p. 92, Fig. 52 C (as Rhizosolenia alata f. indica); Crosby and Wood, 1958: p. 520, Pl. 38: 62 c (as Rhizosolenia alata f. indica); Hendey, 1964: p. 147, Pl. II: 4 (as Rhizosolenia alata f. indica); Simonsen, 1974: p. 28 (as Rhizosolenia alata f. indica); Ricard, 1987: p. 171, Figs. 200, 201 (as Rhizosolenia
alata f. indica)
Cells much larger and broader than the type; 16-54 µm in diameter;calyptrae, because of this greater diameter, more strongly and suddenly attenuated, the process more striking. Structure very delicate; in many individuals, however, coarser than in the type. Cell wall finely punctated, puncta in quincunx rows, short and consequently, appear to be irregular (Cupp, 1943).
Cells length 390-710 µm; diameter 45-50 µm.
Warm water species.
Sites of occurrence in RSA:
In Winter 2006 Cruise, this species was frequently observed at various sites (refer sites map),often in large numbers; maximum abundance (5.3*10^3cells/l) was associated with the northwestern part of the inner RSA (St. 7). It has been previously reported from the inner RSA (Simonsen, 1974) and from Kuwaiti waters (Al-Kandari et al., 2009 as Proboscia alata f. indica).