Funnel–mantle locking apparatus

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 cartilaginous).[1] The apparatus may permit some anterior–posterior displacement or prevent movement altogether.[1]

Funnel–mantle locking apparatus of a juvenile male Argonauta hians

Function

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Variability

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Funnel component

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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

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Shape of mantle locking apparatus Species Family
  Mastigoteuthis grimaldii Mastigoteuthidae

References

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  1. ^ a b c 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.