Olifantiella societatis 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 societatis C.Riaux-Gobin

Fig. 6A-F

Description.

Valves elliptic to linear-elliptic with rounded apices, 3.9-10.3 μm in length, 2.2-2.8 μm in width and with 31-34 striae in 10 μm. Macroareolae are present at valve face and valve mantle. External buciniportula opening elongate, internally in form of singular tubular process, with a " Nepenthes -like" plug (Fig. 6F ) as in O. mascarenica ( Riaux-Gobin and Compère 2009; Riaux-Gobin and Al-Handal 2012). A short macroareola (not observed in O. societatis type) is present at the prolongation of the buciniportula aperture. At the junction of the valve face and the mantle, a ridge runs over the striae and opens to the exterior by round to oblong fenestrae. Externally, both proximal and distal raphe endings are straight and tear-drop-shaped. Internally raphe endings are straight and simple, forming small helictoglossae at distal endings. Small silica warts are present externally along raphe slits. Internally two broad longitudinal channels and small silica warts between proximal raphe endings are present.

Distribution.

Newly observed from the coast of Sulawesi Island (sample SZCZ 28814), Bangka Island (SZCZ 27565) and Bawean Island (SZCZ 27652). Originally reported from Moorea Island ( Riaux-Gobin 2015).

Figures

Figure 6. SEM documentation of Olifantiella societatis from Sulawesi Island coast (sample SZCZ 28814). Scale bars: 5 µm (A); 4 µm (D); 3 µm (B, C, E); 1 µm (F).