Family: Leptocylindraceae Lebour
Genus: Leptocylindrus Cleve
Scientific name: Leptocylindrus mediterraneus (H. Péragallo) Hasle
Dactyliosolen mediterraneus H. Péragallo
Pavillard, 1925: p. 23, Fig. 34 (as Dactyliosolen mediterraneus); Hustedt, 1930: p. 559, Fig. 317 (as Dactyliosolen mediterraneus); Cupp, 1943: p. 77, Fig. 38 (asDactyliosolen mediterraneus); Crosby and Wood, 1958: p.524, Pl. 39: 81 (as Dactyliosolen mediterraneus); Priddle and Fryxell, 1985: p. 62-63; Throndsen et al., 2007: p. 146.
Cells cylindrical, with numerous intercalary bands and consequently, usually a very long pervalvar axis. Bound in thick, close-set, even stiff chains. Valves 7-11 μm in diameter, with delicate, irregular areolae, without spines or processes. Intercalary bands 1-5 in 10 μm, with ends lying in a straight pervalvar line.
Intercalary bands with large or small areolae, in two-line system, 6-11 in 10 μm. Chromatophores several, not very small, roundish plates. Living cells are nearly always found with yellow epiphytic flagellate, Rhizomonas setigera (Pavillard) Patterson et al. = Solenicola setigera Pavillard, attached on the chains in the girdle-band zone (Cupp, 1943).
Cells length 30-32 µm; diameter 15-17 µm.
Neritic, sporadically oceanic widespread species.
Sites of occurrence in RSA:
In Winter 2006 Cruise, this species occurred at scattered stations (refer sites map), usually in small numbers; maximum abundance (1.7 10 3 cells/l) was associated with the Sea of Oman (St. 93).