Funnel–mantle locking apparatus


The funnel–mantle locking apparatus is a structure found in many cephalopods that connects the mantle and hyponome and restricts their movement relative to each other. It consists of two interlocking components: one located on the mantle and the other on the funnel. The apparatus may permit some anterior–posterior displacement or prevent movement altogether.

Variability

Funnel component

Six major forms of the funnel locking apparatus are recognised among teuthids and several more are found in the sepioids.
Shape of funnel locking apparatusSpeciesFamily
Idioteuthis cordiformisMastigoteuthidae
Magnapinna talismaniMagnapinnidae
Mastigoteuthis flammeaMastigoteuthidae
Mastigoteuthis glaukopisMastigoteuthidae
Mastigoteuthis grimaldiiMastigoteuthidae
Mastigoteuthis magnaMastigoteuthidae