Adlafia bryophila Lange-Bertalot

• Main Authors: Alibert, Marie, Hamilton, Paul B., Pienitz, Reinhard, Antoniades, Dermot
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Chromista; Ochrophyta; Bacillariophyceae; Naviculales; Naviculaceae; Adlafia; Adlafia bryophila; Iceland
• Online Access: https://doi.org/10.5281/zenodo.10392932; http://treatment.plazi.org/id/AB6887832B3DFFECFC9FF884FEFF4EE9

Adlafia bryophila (J.B.Petersen) Lange-Bertalot (Figs 10 A-R; 11 A-F) Bibliotheca Diatomologica 38: 89 (Moser et al . 1998). — Navicula bryophila J.B.Petersen, The Botany of Iceland 2: 388 (Petersen 1928). ECOLOGY AND DISTRIBUTION. — Adlafia bryophila was commonly observed inTursujuq National Park, found in 23 lakes.It was generally present in low relative abundances, with a mean of 0.5% and maximum of 2.7%. No distributional pattern was found in relation to general environmental conditions, but it appears to be a circumneutral species (Appendix 3). Moreover, its distribution may be affected by Mg and dissolved inorganic carbon (DIC) concentrations (Appendices 4; 5). This taxon has been identified from the circumpolar Arctic region. DESCRIPTION The frustules are rectangular and narrow in girdle view. The valves exhibit a linear to linear-lanceolate shape with rostrate ends. Based on a sample size of 28, the valve dimensions range from a length of 11.5 to 19 µm and a width of 3 to 4 µm. The stria number ranges from 28 to 30 in 10 µm. Externally, the valve face is flat. The axial area is weakly curved, lanceolate, and narrow. In LM, the axial area is almost indistinct. The central area is large, round to elliptic, favouring one side, and it possesses three to four marginal striae (Fig. 11C). The raphe is linear, without any kink-like irregularity halfway between the mid-valve and apex (Fig. 11A). Externally, the central raphe fissures are linearly expanded with small pores slightly deflecting to one side. The terminal raphe fissures are curved and extend down onto the upper region of the mantle (Fig. 11E). Adjacent to the terminal raphe, there is a ridged groove that runs from the valve face to the upper mantle. Internally, the raphe is located on an elevated sternum and appears straight, without any kink-like irregularity. The proximal raphe fissures are deflected to the same side (Fig. 11D). The terminal fissures end on small elevated helictoglossae, isolated from the apex mantle (Fig. 11F). The striae are ...