Psammodictyon constrictum (Gregory) D.G. Mann

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 : 131

138. Psammodictyon constrictum (Gregory) D.G. Mann Fig. 165

References: Navarro (1983b), p. 394, figs 12–15; Witon & Witkowski (2006), figs 249, 250, 256, 257, 269; Al-Handal et al. (2016), p. 36, pl. 10, fig. 13; Lobban et al. (2012), p. 301, pl. 59, figs 6–8; Lobban (2015a), p. 16.

Samples: Moen1_ Padina, Moen 4_ Dictyota

Dimensions: 13.1–24.8 μm long, 6.6–11.9 μm wide; 16–23 striae in 10 μm, 15–20 areolae in 10 μm; 17 fibulae in 10 μm.

Comments: The taxonomy of this group of nitzschioids is very confused there are many similar species for which no names can yet be assigned. The group is sometimes called Tryblionella coarctata (Grunow) D.G. Mann complex but the loculate structrure of the common species in Micronesia seems to best fit into Psammodictyon ( Lobban 2015a) .

Figures

FIGURES 145–167. Twenty-one nitzschioid diatom species. Fig. 145. Nitzschia sp. 1. Fig. 146. Nitzschia sp. 2. Fig. 147. Nitzschia sp. 3. Figs 148 and 149. N. scalpelliformis. Fig. 150. N. fluminensis. Fig. 151. N. ventricosa. Fig. 152. Nitzschia sp. 4. Figs 153 and 154. Bacillaria sp. Fig. 155. Nitzschia sp. 5. Fig. 156. Conopeate Nitzschia sp. 6. Fig. 157. Conopeate Nitzschia sp. 7. Fig. 158. Nitzschia sp. 8. Fig. 159. N. lanceola. Fig. 160. Nitzschia sp. 9. Fig. 161. Nitzschia marginulata var. didyma. Fig. 162. Nitzschia sp.10. Fig. 163. Nitzschia sp. 11. Fig. 164. Psammodictyon sp. 1. Fig. 165. Psammodictyon constrictum. Fig. 166. Psammodictyon sp. 2. Fig. 167. P. panduriforme. Scale bar = 10 μm.