Moderate
Cyanea lamarckii
Scyphozoa (Cyaneidae)
Little cousin of the famous "lion's mane jellyfish" (Cyanea capillata), it prefers the cold waters of the Atlantic and the English Channel. It is completely absent from the Mediterranean.
Sting symptoms
Painful sting comparable to nettles. Causes temporary redness.
Identification
Translucent blue to purple (sometimes yellowish in juveniles). Its umbrella is slightly lobed (scalloped) and it trails an abundant "mane" of dozens of fine tentacles.
Size
Umbrella: 15 to 30 cm
Habitat
Coastal waters and open sea (cold to temperate waters).
Scientific family
Scyphozoa (Cyaneidae)