Funnel–mantle locking apparatus

Funnel–mantle locking apparatus of a juvenile male Argonauta hians

The funnel–mantle locking apparatus is a structure found in many cephalopods that connects the mantle and hyponome (funnel) and restricts their movement relative to each other.[1] It consists of two interlocking components: one located on the mantle (often fibrous) and the other on the funnel (often cartilagenous).[1] The apparatus may permit some anterior–posterior displacement or prevent movement altogether.[1]


Funnel component

Six major forms of the funnel locking apparatus are recognised among teuthids (lazy-T shape, inverted-T shape, straight shape, triangular shape, oval with tragus and/or antitragus, and oval shape) and several more are found in the sepioids (including the boomerang shape and keyhole shape).[2]

Shape of funnel locking apparatus Species Family
Idioteuthis cordiformis Mastigoteuthidae
Magnapinna talismani Magnapinnidae
Mastigoteuthis flammea Mastigoteuthidae
Mastigoteuthis glaukopis Mastigoteuthidae
Mastigoteuthis grimaldii Mastigoteuthidae
Mastigoteuthis magna Mastigoteuthidae

Mantle component

Shape of mantle locking apparatus Species Family
Mastigoteuthis grimaldii Mastigoteuthidae


  1. 1 2 3 Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project.
  2. Young, R.E., M. Vecchione & K.M. Mangold (1997). Cephalopod Funnel Locking-Apparatus. Tree of Life Web Project.
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