Chionoecetes angulatus

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Triangle Tanner crab:
Triangle Tanner crab (Chionoecetes angulatus): The triangle Tanner crab is the deepest living of our Tanners, always below 100 meters and most often deeper than 400 meters. This species and the closely related Grooved Tanner crab (Chionoecetes tanneri) are distinct in having sharp spines on the antero-lateral margin on the carapace and a distinct groove in the center of the carapace toward the back. This species can be distinguished from Grooved Tanner crab (Chionoecetes tanneri) due to a wide groove on the back center of the carapace and a single large spine on the back lateral margin of the carapace.

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