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Johnlongia is an
extinct genus of sand
shark from the
Cretaceous period. It
contains two
described species, J.
parvidens and J. allocotodon, and possibly...
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Synodontaspis † White, 1931
Subfamily Johnlonginae † Shimada, 2015
Genus Johnlongia †
Genus Pseudomegachasma † (Shimada, 2015) Froese, Rainer; Pauly, Daniel...
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Johnlonginae is an
extinct subfamily of sand
shark with two genera:
Johnlongia and Pseudomegachasma. The
latter genus is
thought to have
evolved from former...
- most
likely derived from its
closest relative, the
piscivorous shark Johnlongia. As its name suggests, it was
originally classified under Megachasma,...
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appendiculata N/A N/A N/A An
extremely widely used
lapsus calami for Cretalamna.
Johnlongia Indeterminate Smoky Hill
Chalk An
odontaspidid lamniform shark Pseudocorax...
- 1979 †Jimpohlia
erinacea Zangerl, 1979 †
Johnlongia Siverson, 1996 †
Johnlongia allocotodon Siverson, 1996 †
Johnlongia parvidens Cappetta, 1973 †Jurobatos Thies...
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Archaeolamna and Dallasiella, the
durophagous Ptychodus, and the sand
shark Johnlongia.
Several bony fish are also known. Many of
their fossils are too fragmentary...
