frustule

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frustule

[′frəs‚chül]
(invertebrate zoology)
The shell and protoplast of a diatom.
A nonciliated planulalike bud in some hydrozoans.
References in periodicals archive ?
As we counted only living cells, we can assume that a substantial part of the measured BSi, especially during May-August, originated from empty frustules of diatoms that were overlooked during the counting procedure and were kept in water by the turbulent flow.
Natural counting units were defined as one unit for each colony, filament, diatom frustule (regardless if colonial or filamentous) or unicellular algae.
A general impression for the postbloom period was stagnation within the phytoplankton community, revealed by relatively high levels of bacteria, fragments of particulate material, empty diatom frustules, and fecal pellets.
During the rest of the period, empty diatom frustules were probably an important contributor to the basic level of about 5 mg/L.
Micritic limestones contain barite, formed at the expense of Ba scavenged to the frustules of silica-producing planktonic organisms during their fall through the water column.
A sediment trap collects not only carbon products but also other kinds of particles: For example, we have found that the export flux of biogenic silica produced by plankton with siliceous frustules and tests provides important information for understanding another type of basin-scale biological pump (see Arabian Sea article on page 24).
One group, the Chaetoceros species (see illustration above headline on page 2), are known for the formation of enormous glass spines with sharp triangular barbs extending out from their frustules.