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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References in periodicals archive ?
It has been claimed that the pillars in cuttlebones are homologous to structures found on the siphuncle in Spirula, Nautilus, and fossil cephalopods (Bandel and Boletzky, 1979), but the cuttlebone's pillars are unique in having spread over the entire septal surface and in playing a major role in structural support of the septa.
The cuttlebone faces an osmotic pumping limit: below about 240 m, the siphuncle probably cannot maintain an osmotic gradient to prevent cameral flooding.
-- Crushed and distorted phosphate casts consisting of varying numbers of camerae, up to 19 per 1 volution; subglobular shape; involute; maximum diameter = 5.06 cm; faint transverse ornament, up to sixteen ribs per five mm; transverse ribbing maintained on all camerae where visible; evident hyponomal deflection, deflection from horizontal = 4.01 mm; umbilical diameter = 0.2 mm; umbilical shoulders rounded; siphuncle faintly visible at 0.5 times the venter to dorsum distance; widely spaced sutures, with broad ventrolateral saddle; broad lateral and ventral lobe.