Lira (mollusc) - Wikipedia

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Lirae (singular lira) are a sculptural feature of the outside of the shells of various molluscs. An organism bearing lirae is "lirate". The feature was described by Leslie Reginald Cox in 1960 as a "fine linear elevation on shell surface or within outer lip" of gastropod shells.^[1] The term is also commonly applied to the shells of bivalves, nautiloids and brachiopods.^{[citation needed]}

References

[edit]

↑ Cox, L. R. (1960). Part I, Mollusca 1, ch. 2, p. 184-169. Treatise on Invertebrate Paleontology.

v t e Bivalve anatomy
Shell	Callus Hinge line Hinge teeth Ligament Lira Lunule Nacre Pallial line Pallial sinus Periostracum Prodissoconch Resilifer Resilium Sculpture Umbo Valve Beak Annuli
Other hard parts	Byssus Pearl Sea silk
Soft parts	Adductor muscles Ctenidium Gastric shield Mantle Nephridium Siphon
Other	Abductin Glochidium Pseudofeces Trochophore Veliger

Cephalopod anatomy

Shell

Types

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

Features

External	Aperture Apex Callus Lirae Periostracum Sculpture Spire Sutures Umbilicus
Internal	Body chamber Camerae Nacre Phragmocone Septa Siphuncle Whorls

Mantle &
funnel

External anatomy	Dermal structures Fins (wings) Flotation devices ("secondary fins") Funnel–mantle locking apparatus Tail
Internal anatomy	Branchial hearts Ctenidia (gills) Hepatopancreas (digestive gland) Ink sac and ink Needham's sac Nephridia ("kidneys") Nidamental glands Osphradium Pericardial glands

Head &
limbs

Brachial crown	Arms Hectocotylus Tentacles Carpus Dactylus Manus Suckers and hooks
Buccal region	Aptychus Beak Odontophore Radula Spadix and antispadix
Occipital region	Nuchal crest (occipital crest) Nuchal folds (occipital folds) Occipital membrane Olfactory organ Nuchal organ
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)

v t e 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 Teleoconch 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	Albumen gland 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