Detail of the siliceous scales of the centroheliozoan, Rraphidocystis lemani (Penard, 1904) Nicholls and Dürrschmidt, 1985. This species has straight tubular elements (one of these is clearly seen at one o'clock in this image) as well as shorter funnel-shaped elements and tangential plate scales.Collected from organically enriched sediments of slow-moving freshwater stream near Boise, Idaho. DIC
