Johnlonginae is an

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

subfamily of sand shark with two genera: '' Johnlongia'' and ''

Pseudomegachasma ''Pseudomegachasma'' ("false megamouth") is an extinct genus of filter-feeding shark that was closely related to the modern sand tiger shark. It is known from Cretaceous strata in Russia and the United States, and is the only known planktivorous ...

''. The latter genus is thought to have evolved from former. They are among the older sand sharks, and are only known from the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

period.

References

Cretaceous sharks Odontaspididae Prehistoric animal subfamilies Fish subfamilies Fossil taxa described in 2015 {{cretaceous-fish-stub