Nidamental gland

Ventral view of the viscera of Chtenopteryx sicula, showing the presence of the nidamental glands and accessory nidamental glands.

Nidamental glands are internal organs found in some elasmobranchs and certain molluscs, including cephalopods (specifically Decapodiformes and nautiluses) and gastropods.^[1]^[2]^[3]

In cephalopods, nidamental glands are large, paired glandular structures found in the mantle cavity.^[4] Accessory nidamental glands may also be present.^[4] Nidamental glands are composed of lamellae and are involved in the secretion of egg cases or the gelatinous substance comprising egg masses.^[1]

Culinary uses

Nidamental glands of cuttlefish are eaten as food in various parts of the world, included either in dishes in which the whole animal is consumed, or separately. In southern Spain, for example, they are cooked whole and known as huevos de choco and there is a popular notion that these organs are the gonads of the male cuttlefish.^[5]

References

1 2 Young, R.E., M. Vecchione & K.M. Mangold (1999). Cephalopoda Glossary. Tree of Life Web Project.
↑ Prasad, R.R. (1948). "Observations on the Nidamental Glands of Hydrolagus colliei, Raja rhina and Platyrhinoidis triseriatus". Copeia. 1948 (1): 54–7. doi:10.2307/1438791. JSTOR 1438791.
↑ Bloodgood RA (1977). "The squid accessory nidamental gland: ultrastructure and association with bacteria". Tissue Cell. 9 (2): 197–208. doi:10.1016/0040-8166(77)90016-7. PMID 906013.
1 2 Nair, J.R., D. Pillai, S.M. Joseph, P. Gomathi, P.V. Senan & P.M. Sherief (2011). "Cephalopod research and bioactive substances." (PDF). Indian Journal of Geo-Marine Sciences 40(1): 13–27.
↑ http://cocinarconciencia.blogspot.com.es/2013/02/huevos-de-choco-en-pipirrana.html

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 • Egg fossils • Protoconch (embryonic shell)

Gastropod anatomy

Shell	Aperture Apex Body whorl Callus Columella Lip Lira Nacre Periostracum Peristome Planispiral Plait Protoconch Sculpture Selenizone Siphonal canal Siphonal notch Spire Stromboid notch Suture Umbilicus Valve Varix Whorl

Other hard parts	Clausilium Love dart Operculum Pearl Radula

External soft parts	Caryophyllidia Caudal mucous pit Cerata Cnidosac Mantle Mentum Notum Parapodium Pneumostome Rhinophore Semper's organ Siphon Suprapedal gland

Internal soft parts	Circulatory system of gastropods Crop Ctenidium Digestive system of gastropods Diverticula Excretory system of gastropods Gastric shield Hancock's organ Hepatopancreas Hypobranchial gland Nephridium Nervous system of gastropods Nidamental gland Odontophore Oesophageal pouch Osphradium Reproductive system of gastropods Respiratory system of gastropods Sensory organs of gastropods

Other	Epiphragm Pseudofeces Torsion Circumesophageal nerve ring Trochophore Tyrian purple Veliger

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