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单词 siphuncle
释义

Definition of siphuncle in English:

siphuncle

noun ˈsʌɪfʌŋk(ə)lˈsaɪˌfəŋk(ə)l
Zoology
  • (in shelled cephalopods such as nautiloids and ammonoids) a calcareous tube containing living tissue running through all the shell chambers, serving to pump fluid out of vacant chambers in order to adjust buoyancy.

    Example sentencesExamples
    • Outwardly indistinguishable from other ammonoids, clymeniids are distinguished internally by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids.
    • As shown above, a dorsal siphuncle is about 50% smaller than a ventral siphuncle of the same diameter.
    • The higher the value, the nearer the siphuncle is toward the concave side of the conch.
    • The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades.
    • Given that the shell that covers the siphuncle is its only permeable surface, the interchange of fluids can take place only through this structure.

Origin

Mid 18th century: from Latin siphunculus 'small tube'.

 
 

Definition of siphuncle in US English:

siphuncle

nounˈsīˌfəNGk(ə)lˈsaɪˌfəŋk(ə)l
Zoology
  • (in shelled cephalopods such as nautiloids and ammonoids) a calcareous tube containing living tissue running through all the shell chambers, serving to pump fluid out of vacant chambers in order to adjust buoyancy.

    Example sentencesExamples
    • The higher the value, the nearer the siphuncle is toward the concave side of the conch.
    • The dorsal siphuncles of the Clymeniida tend to be larger than the ventral siphuncles of other ammonoid clades.
    • As shown above, a dorsal siphuncle is about 50% smaller than a ventral siphuncle of the same diameter.
    • Given that the shell that covers the siphuncle is its only permeable surface, the interchange of fluids can take place only through this structure.
    • Outwardly indistinguishable from other ammonoids, clymeniids are distinguished internally by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids.

Origin

Mid 18th century: from Latin siphunculus ‘small tube’.

 
 
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更新时间:2025/3/4 8:49:07