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.Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project. It consists of two interlocking components: one located on the mantle (often fibrous) and the other on the funnel (often cartilaginous). The apparatus may permit some anterior–posterior displacement or prevent movement altogether.
Function
Variability
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).Young, R.E., M. Vecchione & K.M. Mangold (1997). Cephalopod Funnel Locking-Apparatus. Tree of Life Web Project.
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
References