A group of jellyfish distinguished by their disc-shaped bell and branched oral arms.
From Modern Latin, combining 'disco-' (disc-shaped, from Latin discus) + 'medusae' (plural of medusa, the free-swimming jellyfish form), literally meaning 'disc-like medusas.'
This scientific classification name reveals how Linnaeus and other naturalists were visual observers — they saw jellyfish and named the group based on what they looked like: a disc, which is exactly what the bell of these jellyfish resembles.
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