Olifantiella pilosella C.Riaux-Gobin, 2012

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 pilosella C.Riaux-Gobin

Fig. 5B-F

Description.

Valves elliptic to linear-elliptic with rounded apices, 5.4-8.2 μm in length, 2.3-2.8 μm in width and with 38-43 striae in 10 μm. Macroareolae, both on valve face and valve mantle bordered by thin siliceous spines (pili) and small siliceous plates (flabella). Between buciniportula opening and valve margin, one shortened stria is present. Apical slits small, without silica projections. Buciniportula complex, internally with two short raised tubular processes. Externally, both proximal and distal raphe endings are tear-drop-shaped and slightly bent opposite to the buciniportula opening with elongate grooves on buciniportula site. Internally raphe endings are straight and simple, forming small helictoglossae at distal endings. Girdle bands numerous with barely visible perforations. Internally, small silica warts between proximal raphe endings are present. Broad longitudinal channels visible internally along the valve margin.

Distribution.

Newly observed from coastal waters of Sulawesi Island (sample SZCZ 28814). Originally described from Rodrigues Island and afterwards observed in Moorea Island ( Riaux-Gobin and Al-Handal 2012; Riaux-Gobin 2015). Additionally observed in Mariana Islands, Guam ( Lobban et al. 2012).

Figures

Figure 5. SEM documentation of Olifantiella paucistriata (A) and Olifantiella pilosella (B-F) from from Sulawesi Island coast (sample SZCZ 28814). Scale bars: 3 µm (A-D); 2 µm (E); 1 µm (F).