SIZE
In general, hydromedusae are fairly small in size, with adults usually being between 1mm to 2-3cm (Ruppert et al., 2004). A few species achieve larger sizes such as Aequorea aequorea that as a fully-grown adult reaches a bell diameter of up to 20cm (Ruppert et al., 2004).
This specimen was found to be 9cm in diameter.
The tentacles of this specimen varied between 10cm and 30cm, depending on whether they were retracted or extended.
Figure 2.1: Aequorea sp. showing diameter and tentacles that
are fully extended
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