- according to Hottinger (2006):
SPINE - (acicular spine); a calcite rod normal to the test surface, thin, round, triangular to triradiate in section, running through a hole in the outer lamella of planktic foraminifera. Arises apparently from the median layer of the chamber wall. At its base it is surrounded by a more or less conical mound, the spine base. Acicular spines are shed during the planktonic life cycle, when descending in the water column prior to reproduction.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744.
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