Barnacle Billie:

Rocket Girl:

Ruby:

The distance from one tripod leg tip to the other is 20.4 cm . With that as a reference, I calcuilate the straight

carapace length to be just under 57 cm and straight carapace width to be a bit over 42 cm.

Video of Ruby eating (note: soft silicone sleeves were in contact with the live coral when the trippod was carefully placed):