Olifantiella gorandiana C.Riaux-Gobin

Rybak, Mateusz, Arsad, Sulastri, Riaux-Gobin, Catherine, Luthfi, Oktiyas Muzaky, Hallegraeff, Gustaaf, Cias, Renata, Kierzek, Agnieszka & Witkowski, Andrzej, 2023, Distribution and morphology of the diatom genus Olifantiella Riaux-Gobin & Compere in Indonesian and Australian waters, including the description of O. gondwanensis sp. nov., PhytoKeys 236, pp. 197-213 : 197

Olifantiella gorandiana C.Riaux-Gobin

Fig. 3A-F

Description.

Valves elliptic to lanceolate with rounded to sub-rostrate apices, 4.8-6.8 μm long, 1.5-2.3 μm wide and with 58-67 striae in 10 μm. Buciniportula complex, internally with two short not raised tubular strctures flanked by two small satelites, external opening shifted near the valve margin. Buciniportula on both valves located on the same side of the frustule. Externally proximal raphe endings straight and slightly tear-drop-shaped, distal raphe endings with small, hooked grooves on site opposite to buciniportula. Internally proximal raphe endings rounded, distal raphe endings with small helictoglossa. Two types of girdle bands are present. The first one, wide with two rows of perforations (120-133 perforations in 10 μm) and second, thin without any perforations. Internally, this species shows a lack of longitudinal channel.

Distribution.

Newly observed from coastal waters of Sulawesi Island (sample SZCZ 28814). Originally reported from Rodrigues Island and also observed in French Polynesia, Western Indian Ocean ( Riaux-Gobin 2015; Riaux-Gobin et al. 2019), Galapagos Island and West Coast of United States (Witkowski - unpublished data).

Comments.

All observed specimens represent the morphotype ‘b’ following Riaux-Gobin et al. (2019).

Figures

Figure 3. SEM documentation of Olifantiella gorandiana from Sulawesi Island coast (sample SZCZ 28526). Scale bars: 3 µm (B, D); 2 µm (A, E, F); 1 µm (C).