Callichimaera
Description
Callichimaera perplexa is an extinct crab from the Cretaceous. In life, it would have been around 2.5 cm/1'' across, the size of many water beetles. I've imagined the swimming style to be like that of dytiscid beetles or corixid bugs rather than a portunid crab, but I'm not aware of any evidence either way. This model is based on Luque et al. (2019). It's a pretty little critter, thanks to dinoking27 for suggesting it to me.
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