siphuncle


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Related to siphuncle: spermatophore

siphuncle

[′sī‚fəŋ·kəl]
(invertebrate zoology)
A honeydew-secreting tube (cornicle) in aphids.
A tubular extension of the mantle extending through all the chambers to the apex of a shelled cephalopod.
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Although Kroger (2006) placed Hedstroemoceras in Pseudorthocerida, the shape of the shell and the position and form of the siphuncle suggest rather an affinity with oncocerids (D.
2 mm; umbilical shoulders rounded; siphuncle faintly visible at 0.