siphuncle

American  

[sahy-fuhng-kuhl] / ˈsaɪ fʌŋ kəl /

noun

1. (in a nautilus) the connecting tube that passes from the end of the body through all of the septa to the innermost chamber.

2. Entomology. an aphid cornicle.

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Other Word Forms

• siphuncular
  adjective
• siphunculate
  adjective
• siphunculated
  adjective

Etymology

Origin of siphuncle

1895–1900; < Latin sīp ( h ) unculus small tube through which water is forced, equivalent to sīp ( h ) ōn-, stem of sīp ( h ) ō siphon + -culus -cule ¹ ( see carbuncle)

Example Sentences

The siphuncle does not communicate with the coelomic cavity; it is a simple vascular process of the mantle, whose cavity consists of a venous sinus, and whose wall contains a ramification of the pallial artery.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

The direction of the coil of the shell cannot be determined by the position of the siphuncle, which traverses the septa centrally, ventrally or dorsally.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

The siphuncle also commences with a dilatation which deeply indents the front wall of the initial chamber, called the protoconch, but does not penetrate into its cavity.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

In many fossil forms these septal necks are continued from the septum from which they arise to the next, so that the siphuncle is enclosed in a complete secondary calcareous tube.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" by Various

The dotted line shows the position of the siphuncle.

From The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants by Dawson, Sir J. William