It occupies an honorable place in the ranking of the most unique fish. This dangerous creature is considered the king of the depths of the underwater world. Originating from the Cretaceous period, this frilled predator has not changed over a long time of existence, and practically did not evolve. Due to anatomy and morphology, the two surviving species are considered the oldest shark in existence. For this reason, they are also called 《living fossils》
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Frilled eel sharks have a long, slender body with an elongated tail fin, giving them the appearance of an eel. The body is a uniform chocolate brown or gray color, with wrinkles protruding on the abdomen. There is a small dorsal fin located closer to the tail, above the large anal fin and in front of the highly asymmetrical caudal fin. The pectoral fins are short and rounded. Frilled sharks are part of the Hexanchiformes order, which is considered the most primitive group of sharks.
The head has six gill openings (most sharks have five). The lower ends of the first gill extend all the way down the throat, while all the other gills are surrounded by frilly edges of skin — hence the name “frilled shark”. The muzzle is very short and looks like it has been cut off; the mouth is greatly expanded and finally attached to the head. The lower jaw is long.
The teeth on the upper and lower jaws are uniform, with three strong and sharp crowns and a pair of intermediate crowns. The anal fin is larger than a single dorsal fin, and the caudal fin lacks a subterminal groove. The maximum known length of a frilled shark is 1.7 m for males and 2.0 m for females. Males become sexually mature, barely reaching a meter in length.
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