A major suborder of flies (Diptera) characterized by a circular suture on the head through which the adult fly emerges from its pupal case.
From Greek 'cyclo-' (circle) + 'raphe' (seam, suture). The name describes the distinctive circular seam visible on the head of these insects.
That little circular scar on a fly's head is basically its birth mark—it's where the adult fly literally cracked open its pupal case to break free, and it's the key feature that defines this entire suborder of flies!
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