Gyrosigma sp.

Park, Joon Sang, Lobban, Christopher S. & Lee, Kyun-Woo, 2018, Diatoms associated with seaweeds from Moen Island in Chuuk Lagoon, Micronesia, Phytotaxa 351 (2), pp. 101-140 : 123

94. Gyrosigma sp. Fig. 106

Samples: Moen1_ Halimeda

Dimensions: 89.9 μm long, 14.6 μm wide; transapical striae 18in 10 μm, longitudinal striae 16 in 10 μm.

Comments: Although this specimen has the parallel sides and broadly rounded apices of the brackish water species G. balticum (Ehrenberg) Rabenhorst , it is much smaller (even smaller than G. balticum var. diminutum (Grunow) Cardinal, Poulin & Bérard-Therrault and without the strong wave in the raphe) ( Cardinal et al. 1989). There are several simulacrum species for G. balticum (and perhaps other species) that require careful observation to distinguish ( Sterrenburg 1995).

Figures

FIGURES 102–113. Eleven diatom species of Naviculales. Fig. 102. Pinnunavis yarrenis. Figs 103 and 104. Trachyneis aspera. Fig. 105. Trachyneis velata. Fig. 106. Gyrosigma sp. Fig. 107. Caloneis liber var. linearis. Fig. 108. Caloneis sp. 1. Fig. 109. Caloneis sp. 2. Fig. 110. Caloneis sp. 3. Fig. 111. Chamaepinnularia clamans. Fig. 112. Fallacia sp. Fig. 113. Sellaphora sp. Scale bar = 10 μm.