Achnanthes felinophila

Valves distinctly triundulate in large specimens (Figs 31-34, 41-45), becoming less triundulate and more lanceolate in smaller valves (Figs 35-40, 46-50), with narrowly rounded to cuneate ends, 11-46 µm long, 6-10 µm wide. Raphe valve with narrow axial area and a rectangular central area reaching the valve margins. Raphe externally sinuous, with proximal ends deflected slightly in one direction (Fig. 51), with distal ends curved strongly towards mantle in opposite direction. Internal raphe slits with proximal ends straight (Fig. 52). Rapheless valve with axial area near valve margin. Striae punctate, radiate throughout on raphe valve (Figs 31-40), on rapheless valve parallel in the center becoming radiate with respect to the axial area, curved at ends (Figs 41-50), 13-15 in 10 µm on both valves. Puncta 16 in 10 µm on both valves. Internal costae separating striae with oblique ridges in rapheless valve forming a spiral pattern visible by SEM (Figs 53, 54).

• Author
  R.L.Lowe and A.R.Sherwood 2009
• Length Range
  11-46 µm
• Width
  6-10 µm
• Striae in 10µm
  13-15 on both valves