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REP: The Tuna prawns

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The tuna prawns are freshwater tentaculopods present in several of the larger lakes of the Northern Continent, which formed during the collision of the western and eastern landmass. They are very fast and endurant swimmers hunting in the open water. The strong physical demands of this lifestyle led to a shape very similar to Earth's tunas, but the similarity is superficial. Unlike most tentaculopods, tuna prawns and their relatives possess jaws that work against each other rather than against the rostrum, which is reduced. The head of tuna prawns extends to the back to accomodate the enlargened gills and to increase the streamlined shape, the two front pairs of the lateral tentacles fit into grooves, while the rest of the tentacles has been lost. To make up for the reduced smelling ability, the eyes are well-developed and tuna prawns hunt mostly by sight. In contrary to tunas, tuna prawns are mostly solitary, only sometimes forming groups of few individuals. The only exception is during the mating season, when the tuna prawns move into shallow waters, where they build nests side by side to attract mates and raise the young.

Pike tuna prawn: This species has given up the endurant open water hunting to live as an ambush predator close to the bottom in shallower areas. The fin-like projections on the body are reduced, save for the enlarged tail fin and the jaws are elongate and hook-like to hold onto prey. 
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DoctorDarwin's avatar
I do not know why, I do not care. This is one of my favorites