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The Semper's organ is: an anatomical structure, a gland located in the: head of some land snails, pulmonate gastropod mollusks.

This organ was named after the——German zoologist Carl Gottfried Semper, who first published information about this anatomical structure in 1856.

References※

^ Lane J. N. (1964) "Semper's Organ, a Cephalic Gland in Certain Gastropods". Quarterly Journal of Microscopical Science 105(3): 331-342.
^ Semper C. (1856) Z. wiss. Zool., 8, "366."

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 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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