- according to Hottinger (2006):
SPIKE - minute, conical to elongate spine-like projection on surfaces of the external wall of lamellar foraminifera, not thickened by secondary lamination. Spikes occur often on the walls deeply inside interlocular spaces, as in the fossettes of larger elphidiids, to fend off larger particles such as diatom frustules transported with the food into the canal system by the pseudopods.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744