The shell of species within this family varies from planispiral to needle-shaped.
2.
The shape of the shell is planispiral.
3.
This is an easily recognizable species : the shell is flat-coiled ( planispiral ).
4.
Many cephalopods and tubeworms can also have a planispiral shell ( Allaby and Allaby, 1999 ).
5.
The test is free, starting with a brief planispiral coil followed by a straight uncoiled stage.
6.
The shells are conical and curved in a planispiral way, and they are usually whitish in color.
7.
In a few gastropod families the shells are not helical in their coiling, but instead are planispiral, flat-coiled.
8.
Those in the Globorotaliacea are typically trochospiral and smooth while those in the Globigerinacea are trochospiral to planispiral in arrangement and spinose.
9.
A spiral shell can be visualized as consisting of a long helical or planispiral shape, for reasons of both strength and compactness.
10.
Asterigerinacea are characterized by a trochospiral or nearly planispiral arrangement of the chambers, which are fully or partially subdivided by internal partitions.
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