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]

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).^[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

References

↑ 1.0 1.1 1.2 Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project.
↑ Young, R.E., M. Vecchione & K.M. Mangold (1997). Cephalopod Funnel Locking-Apparatus. Tree of Life Web Project.

Cephalopod anatomy

Shell

Shell types	External shells: Ammonoid shell Argonautid eggcase Nautiloid shell Orthocone Internal shells: Belemnoid guard Cirrate shell Cuttlebone Gladius (pen) Spirula shell Stylet

External features	Aperture Apex Callus Lirae Periostracum Sculpture Spire Sutures Umbilicus

Internal features	Body chamber Camerae Nacre Phragmocone Septa Siphuncle Whorls

Mantle

External anatomy	Funnel Dermal structures Fins (wings) Mantle locking-apparatus

Internal anatomy	Branchial hearts Ctenidia (gills) Hepatopancreas (digestive gland) Ink sac and ink Needham's sac Nephridia ("kidneys") Nidamental glands Osphradium Pericardial glands

Head and limbs

Brachial crown	Arms Hectocotylus Tentacles

Buccal region	Aptychus Beak Odontophore Radula Spadix and antispadix

Other parts	Eyes Statocysts

General

Chromatophores
Photophores
Nervous system
- Squid giant axon
- Squid giant synapse

Developmental stages: Spawn → Paralarva (Doratopsis stage) → Juvenile → Subadult → Adult • Protoconch (embryonic shell)

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