Premise: The Greenland shark ( Somniosus microcephalus ) , also known as the gurry shark , or grey shark , or by the Inuit name eqalussuaq , is a large shark of the family Somniosidae ( `` sleeper sharks '' ) , closely related to the Pacific and southern sleeper sharks .
Hypothesis: The Greenland shark is closely related to other sleeper sharks.
Label: ENTAILMENT