Mallomonas insignis (Penard, 1919). M. insignis has ovoid siliceous scales. Scales arranged around the flagellar opening bear short, sharp spines. Scales at the posterior end of the tail bear long fine spines. M. insignis is similar to M. mesolepis (Skuja) which lacks terminal spinous projections and has diamond-shaped scales. Collected from a temporary slow-flowing freshwater stream near Boise, Idaho. May 2005. DIC.
