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The sharpnose sevengill is widely distributed in tropical and temperate regions of all oceans except the northeastern Pacific.

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The coloration of dark shysharks is highly variable, and they can resemble members of all other species of shyshark.

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Adult chimaeras range in length from about 60 cm (24 in) to 200 cm (79 in).

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Some authors believe that the sharpnose sevengill is distinct enough to be placed in its own family, separate from the rest of the cow sharks.

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Juvenile dark shysharks have slender bodies, while adults are more stocky.

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The leafscale gulper shark can have up to 5 young per litter.

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The sharpnose sevengill and the broadnose sevengill are each the only member of their respective genera.

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There are 50 recorded species of ghost shark, divided into three groups: plow-nose, long-nose, and short-nose.

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The dark shyshark is classed as Least Concern because it is common and not strongly affected by human activity, though given its small range it could be very strongly affected by an increase in fishing or habitat degradation in its area.

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The sailfin roughshark is the only Atlantic roughshark have an incline first dorsal fin spine.

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Blacktip sharks sometimes perform threat displays, a series of movements that takes about 25 seconds to complete.

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Copper sharks return to the same areas year after year. During migrations, individuals have been recorded traveling up to 1320 km (820 mi).

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The leafscale gulper shark was the first species of gulper shark to be described. They can reach a maximum length of about 158 cm (62.2 in).

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Blacktip sharks are timid and consistently lose to equal-sized Galapagos and silvertip sharks when competing for food.

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Sailfin rough sharks live in the northeast and eastern central Atlantic. They are found along the slope of Scotland and Mid-Atlantic ridge, and from Morocco to the Gulf of Guinea.

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Large numbers of copper sharks have been observed hunting together in a seemingly cooperative fashion.

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Blacktip sharks are extremely fast and energetic and are usually found in groups of varying size.