In invertebrate anatomy, cartilage or bone structures that extend outside or beyond the columella (a supporting pillar in animal structures).
From Latin 'extra' (outside) + 'columella' (diminutive of 'columna', meaning column or pillar). Technical zoological anatomical term.
Snails and squid have columella structures supporting their bodies—extracolumella describes special supporting tissue that extends beyond this main structural pillar.
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