In zoology, a needle-shaped structure found in sponges and other organisms; the genus of spiny dogfish sharks.
Direct from Latin acus meaning 'needle.' Used in scientific nomenclature to describe sharp, pointed anatomical features.
The spiny dogfish shark genus Acus gets its name from that distinctive row of venomous spines along its back—Latin taxonomy essentially named it 'The Needle' because of its sharpest feature.
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