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Van Der Hoeven's Organ
Van der Hoeven's organ is the infrabuccal lamellar organ in the adult male of genus ''Nautilus A nautilus (; ) is any of the various species within the cephalopod family Nautilidae. This is the sole extant family of the superfamily Nautilaceae and the suborder Nautilina. It comprises nine living species in two genera, the type genus, ty ...''. It consists of a pair of fleshy narrow parallel lobes each containing 15-19 lamellae. It is analogous to Owen's laminated organ of the females, which is also infrabuccal and also lamellar, though females have an additional secondary sexual organ, the organ of Valenciennes. It along with the spadix and antispadix comprise the secondary sexual organs of the male. Its function has been described as possibly olfactory, but since its discovery in the mid nineteenth century its exact function, like that of its counterpart, has never been adequately explained— this is why it remains named after the naturalist who first described it rather ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nautilus
A nautilus (; ) is any of the various species within the cephalopod family Nautilidae. This is the sole extant family of the superfamily Nautilaceae and the suborder Nautilina. It comprises nine living species in two genera, the type genus, type of which is the genus ''Nautilus (genus), Nautilus''. Though it more specifically refers to the species ''chambered nautilus, Nautilus pompilius'', the name chambered nautilus is also used for any of the Nautilidae. All are protected under CITES CITES Appendix II, Appendix II. Depending on species, adult shell diameter is between . The Nautilidae, both extant and extinct, are characterized by involute or more or less convoluted shells that are generally smooth, with compressed or depressed whorl (mollusc), whorl sections, straight to sinuous Suture (anatomy), sutures, and a tubular, generally central siphuncle.Kümmel, B. 1964. Nautiloidae-Nautilida, in the Treatise on Invertebrate Paleontology, Geological Society of America and Univ of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Owen's Laminated Organ
Owen's laminated organ, named after the 19th century English biologist Richard Owen, is one of two secondary sexual organs of the female of the genus ''Nautilus A nautilus (; ) is any of the various species within the cephalopod family Nautilidae. This is the sole extant family of the superfamily Nautilaceae and the suborder Nautilina. It comprises nine living species in two genera, the type genus, ty ...''. The other is the organ of Valenciennes. Its exact function is unknown. References {{reflist Nautiluses Mollusc anatomy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organ Of Valenciennes
The organ of Valenciennes, named after the French naturalist Achille Valenciennes, is one of two secondary sexual organs of the female of the genus ''Nautilus''. The other is Owen's laminated organ Owen's laminated organ, named after the 19th century English biologist Richard Owen, is one of two secondary sexual organs of the female of the genus ''Nautilus A nautilus (; ) is any of the various species within the cephalopod family Nautili .... Its exact function is unknown. References Nautiluses Mollusc anatomy {{animal-anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spadix (zoology)
In the field of zoology, a spadix ( ; : spadices , ) is a secondary sexual characteristic, secondary sexual organ found in some cephalopods and hydrozoans. In the genus ''Nautilus'', the spadix is a composite erectile organ in the male located in the oral region which is composed of four highly modified tentacles and which is paired with a somewhat smaller antispadix that is also composed of four tentacles. The spadix is normally a concealed organ but quickly becomes distended upon the animal's death. The exact function of the spadix and antispadix in ''Nautilus'' is not yet known. See also *Spadix (botany) References Cephalopod zootomy Sex organs {{Animal-anatomy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
