The prae-genital somite, after appearing in the embryo, either is obliterated (Scorpio, Galeodes, Opilio and others) or is retained as a reduced narrow region of the body, the " waist," between prosoma and mesosoma.
The popular Discovery show Deadliest Catch follows various fishing vessels through two crab seasons: one for the King crab and one for the Opilio crab.
That's why some of the crew members call the Opilio crab "Norwegian Dollars."
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