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Funnel–mantle locking apparatus

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

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
Image Idioteuthis cordiformis Mastigoteuthidae
Image Magnapinna talismani Magnapinnidae
Image Mastigoteuthis flammea Mastigoteuthidae
Image Mastigoteuthis glaukopis Mastigoteuthidae
Image Mastigoteuthis grimaldii Mastigoteuthidae
Image Mastigoteuthis magna Mastigoteuthidae

Mantle component

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Shape of mantle locking apparatus Species Family
Image Mastigoteuthis grimaldii Mastigoteuthidae

References

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  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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