Mammal-like muscles power swimming in a cold-water shark

Article Abstract:

Endothermic birds and mammals maintain a relatively warm and constant body temperature, to cope with the effects of environmental temperature fluctuation, but most of the fishes and other vertebrates are ectothermic and conform to their thermal nice, compromising performance at colder temperatures. The salmon shark is so specialized for endothermy that its red, aerobic, locomotor muscles, which power continuous swimming, seem mammal-like functioning only within a markedly elevated temperature range.

United States, Physiological aspects, Behavior, Environmental aspects, Endothermy

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The oldest articulated chondrichthyan from the early devonian period

Article Abstract:

The oldest known articulated shark remains date from the Early Devonian period, about 394 million years ago. Herein, the discovery of an articulated shark is reported that is almost 409 million years old from the Early Devonian period of New Brunswick, Canada.

Canada, Chondrichthyes, Cartilaginous fishes

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Convergent evolution in mechanical design of lamnid sharks and tunas

Article Abstract:

The swimming kinematics in vivo muscle dynamics and functional morphology of the force-transmission system in a lamnid shark are examined. Lamnid and tunas have developed morphological and functional adaptations in their locomotor systems.

Analysis, Biological systems, Mechanical chemistry, Mechanochemistry

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