Things are getting cray cray

The Nationalnyckeln project slowly moves forward, and who knows, at this pace maybe they will reach their declared goal around the year 3000 or so. The goal being to publish books covering all (!) extant species of multi-cellular organisms found in Sweden. The latest volume, hot off the presses, is titled "Nationalnyckeln: Kräftdjur - tiofotade kräftdjur. Crustacea: Euphausiacea - Decapoda". Yepp, things are going to get cray cray! 

In somewhat plainer English, the book covers two groups of crustaceans: the krill and the decapods. The latter group includes shrimps, crabs, hermit crabs, crayfish, lobsters and God (or is it the other guy) knows what else. I always wax philosophical when leafing through works of this kind. The idea that an indifferent cosmos just tugging along gave rise to sinister-looking creatures like decapods is frankly scarier than the Gnostic take that of course the Devil did it.

We get to meet some old favorites, too. I mean, I can´t be the only person around here who actually *ate* some of this creatures. From my childhood, I remember panicky news broadcasts about the signal crayfish destroying the last remaining populations of European crayfish in Swedish lakes. The European species had already been severly decimated by a disease known as the crayfish plague. Introducing the American signal crayfish (which is resistant to the disease) was originally seen as the salvation of the Swedish crayfish industry (and, I suppose, one of our hallowed summer holiday traditions). Unfortunately, it turned out that the signal crayfish was a vector of the plague - precisely because it´s immune to it. The end result was an almost complete collapse of the remaining European crayfish population! Maybe just as good that I gave up eating crayfish long ago.

As usual, I learned a few new things from this book. For instance, I had no idea that there is actually a European lobster found in Swedish waters (but then, I never really reflected on the exact provenance of my lobster sauce). Or that the claws of the decapods are actually legs?! Or rather legs that adapted to a somewhat different function entirely.

But mostly, I felt ontological dread looking at the full color pictures of bizarre crab-like creatures from the oceanic depths you never knew existed in the first place, realizing that the first representatives of still extant decapod groups evolved over 200 million years ago. Our culinary problems with IAS crayfish are just a blip in the cosmic ocean! And perhaps even a bit cray cray...