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 ?
The frustules are usually linear or lanceolate in both valve and girdle view, but some species are asymmetric along the apical axis in valve view.
Frustules cylindrical in girdle view, joined in short chains, frequently of two cells and rarely of three, four or eight cells, separated by short strutted processes.
They are made of tubular structures of silica (opal), which is more compact and is preserved better than the frustules of diatoms.
Diatoms were recognised by their frustules, whereas the presence of small fragments of leaves was useful in detecting macrophytic remains.
In order to identify the diatom species, the quantitative material was oxidized and cleaned using the technique of Simonsen (1974) modified by Moreira-Filho and Valente-Moreira (1981), and permanent slides were prepared using Naphrax resin as embedding medium for diatom frustules.
The dense bottom layer (80 m) was effectively isolated from water layers above, and we suspect that the deep layer was accumulating regenerated silicate from diatom frustules.
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.
Moreover, the great scallop, Pecten maximus, is capable of selecting Coscinodiscus perforatus by detecting the presence of external organic components on its siliceous shells (frustules) (Beninger and Decottignies, 2005) and rejecting the cleaned frustules of the same diatom species (Beninger et al.
Gallionella granulata Ehrenberg Frustules rectangular in girdle view joined forming filiform colonies.