frustule

/fruhs-chool/US // ˈfrʌs tʃul //UK // (ˈfrʌstjuːl) //

甲壳虫,壳,壳类,硬壳

Definitions

n.名词 noun

Each half of a frustule is called a valve, and the line at which these valves meet is called the suture.
In many cases I believe that each half-frustule becomes coated with a new entire cell-wall, with its siliceous valves.
Frustule cylindrical; zone with longitudinal rows of fine puncta.
Processes very large, cylindrical, placed obliquely and inclined by the torsion of the frustule.
Frustule broad, with rounded angles; septa curved; valve ovate, inferior apex produced.