Amphicocconeis cf. mascarenica Riaux-Gobin & Compère, 2011

Riaux-Gobin, Catherine, Garcia, Marinês, Witkowski, Andrzej, Saenz-Agudelo, Pablo, Coste, Michel & Daniszewska-Kowalczyk, Genowefa, 2021, New Amphicocconeis (Bacillariophyta) from Raivavae and Tahiti Islands (South Pacific) and Porto Belo (Brazil), with re-examination of Psammococconeis, Phytotaxa 513 (1), pp. 30-54 : 52

Amphicocconeis cf. mascarenica Riaux-Gobin & Compère, 2011 ( Figs 62–67 ). Table 1

Remarks:—The measurements and features of the specimens from the Pacific islands (Raivavae, Tahiti and Moorea Isls, Table 1) are close to those from the Mascarenes (Riaux-Gobin et al. 2011: tabl. 2), i.e., with valvocopulae with regularly biseriate rows of simple pores. This taxon is dominant on the Society Archipelago (Tahiti and Moorea Isls) as well as in the Austral Archipelago (Raivavae Isl.). In Tuamotu and Marquesas Archipelagos, Amphicocconeis are less abundant, but with, here again, A. cf. mascarenica as dominant taxon (pers. obs.).

Figures

FIGURES 62–65. Amphicocconeis cf. mascarenica. (material from Raivavae, Tahiti and Moorea Isls, South Pacific).SV in external view (Fig. 62), SV in internal view (Fig. 63), open and narrow SVVC in abvalvar view, with short and fused fimbriae and biseriate short row of pores (Fig. 64), SVVC in abvalvar view (Fig. 65). Scale bars: 2 µm (Figs 62–65).

FIGURES 66–68. Amphicocconeis cf. mascarenica. (material from Raivavae, Tahiti and Moorea Isls, South Pacific). RV in internal view, with RVVC still in place, note the regularly biseriate row of alternate round pores corresponding to each RV stria (Fig. 66), RVVC apex in abvalvar side (Fig. 67), complete and open RVVC in advalvar view (Fig. 68). Scale bars: 3 µm (Figs 66, 68), 600 µm (Fig. 67).