Name: Megalolamna ‭(‬big Lamna‭)‬.
Phonetic: Meg-ah-lam-nah.
Named By: K.‭ ‬Shimada,‭ ‬R.‭ ‬E.‭ ‬Chandler,‭ ‬O.‭ ‬L.‭ ‬T.‭ ‬Lam,‭ ‬T.‭ ‬Tanaka‭ & ‬D.‭ ‬J.‭ ‬Ward‭ ‬-‭ ‬2016.
Classification: Chordata,‭ ‬Chondrichthyes,‭ ‬Elasmobranchii,‭ ‬Lamniformes,‭ ‬Otodontidae.
Species: M.‭ ‬paradoxodon‭ (‬type‭)‬.
Diet: Carnivore/Piscivore.
Size: Teeth up to‭ ‬5‭ ‬centimetres long.‭ ‬Detailed study of the teeth has led to size estimations of about‭ ‬4‭ ‬meters long.
Known locations: Japan.‭ ‬Peru.‭ ‬USA.
Time period: Miocene.
Fossil representation: Teeth.

       Megalolamna is a genus of shark that lived during the Miocene period.‭ ‬So far only teeth of this shark have been found,‭ ‬but these are known from as far apart as Japan to Peru and even the states of California and North Carolina in the USA.‭ ‬These locations tell us that Megalolamna was not only active in the Pacific Ocean,‭ ‬but also frequented the Atlantic as well.‭ ‬This makes even more sense when you realise that during the Miocene,‭ ‬there was actually a seaway that separated the continents of North and South America,‭ ‬allowing a convenient passage for marine animals travelling between the two oceans.‭
       Study of the teeth and reconstructions of the jaw indicate that Megalolamna could realistically grow to lengths of about four meters.‭ ‬By comparison the largest predatory shark alive today,‭ ‬the famous great white‭ (‬Carcharodon carcharias‭)‬,‭ ‬is known to often exceed six meters in length.‭ ‬With that said a large Megalolamna would still be big enough to be dangerous to a person swimming,‭ ‬though Megalolamna would have been a metaphorical minnow when compared to the truly giant sharks of the Miocene such as the infamous C.‭ ‬megalodon.

Further reading
-‭ ‬A new elusive otodontid shark‭ (‬Lamniformes:‭ ‬Otodontidae‭) ‬from the lower Miocene,‭ ‬and comments on the taxonomy of otodontid genera,‭ ‬including the‭ '‬megatoothed‭' ‬clade.‭ ‬-‭ ‬Historical Biology:‭ ‬1‭–‬11.‭ ‬-‭ ‬K.‭ ‬Shimada,‭ ‬R.‭ ‬E.‭ ‬Chandler,‭ ‬O.‭ ‬L.‭ ‬T.‭ ‬Lam,‭ ‬T.‭ ‬Tanaka‭ & ‬D.‭ ‬J.‭ ‬Ward‭ ‬-‭ ‬2016.


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