Adlafia multnomahii

Valves lanceolate with capitate to rostrate apices (Figs. 1–26). Length 9–16 μm, width 4–5 μm, striae density (estimated from SEM) 37–45 per 10 μm. Raphe filiform with strongly unilaterally deflected (hooked) distal ends in an outer valve view and strongly unilaterally deflected proximal ends in an inner view (Figs. 27–35). Proximal and distal ends are deflected in opposite directions. Helictoglossa small and raised (Fig. 31). Axial area narrow in an outer view and conspicuously raised in an inner view (Figs. 27–32). Striae uniseriate, strongly radiate, convergent at apices, and running from the axial area onto a deep valve mantle (Figs. 27–30, 36). Striae continue at the valve apices, where they are only interrupted by the raphe distal hook (Figs. 27, 31). Areolae occluded by a sieve-like velum located on the outer side of the areolae Figs. 35, 37, 38). Girdle bands narrow, open, and bearing one row of areolae which becomes two toward the valve apices (Figs. 27–30, 33, 34, 37, 38). Plastids unknown. Etymology.—The species is named after the Multnomah tribe that flourished on the Willamette River’s Sauvie Island, a portion of which falls within the boundaries of the State of Oregon’s county named after the tribe.

• Author
  E.Morales and Le 2005
• Length Range
  9-16 µm
• Width
  4-5 µm
• Striae in 10µm
  37-45