Funnel–mantle locking apparatus

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File:Argonauta hians lock.jpg
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
File:Idioteuthis cordiformis7.jpg Idioteuthis cordiformis Mastigoteuthidae
File:Magnapinna talismani4.jpg Magnapinna talismani Magnapinnidae
File:Mastigoteuthis flammea2.jpg Mastigoteuthis flammea Mastigoteuthidae
File:Mastigoteuthis glaukopis3.jpg Mastigoteuthis glaukopis Mastigoteuthidae
File:Mastigoteuthis grimaldii3.jpg Mastigoteuthis grimaldii Mastigoteuthidae
File:Mastigoteuthis magna3.jpg Mastigoteuthis magna Mastigoteuthidae

Mantle component

Shape of mantle locking apparatus Species Family
File:Mastigoteuthis grimaldii4.jpg Mastigoteuthis grimaldii Mastigoteuthidae


  1. 1.0 1.1 1.2 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.