si·​phun·​cle | \ ˈsīˌfəŋkel\
plural -s

Definition of siphuncle

1a : a membranous tubular extension of the mantle which runs through the partitions of the chambers to the apex of a shelled cephalopod : siphon
b : the shelly structures that are usually funnel-shaped or tubular processes of the septa and that ensheathe and support the cephalopod siphuncle
2 : a cornicle of an aphid

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History and Etymology for siphuncle

New Latin siphunculus, from Latin, little pipe, diminutive of sipho, siphon siphon

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