"... the Land Shark is considered the cleverest of all sharks. Unlike the Great White shark, which tends to inhabit the waters and harbors of recreational beach areas, the Land Shark may strike at any place, any time."
When you cast a summon monster spell with the feat Versatile Summon monster, you may apply a simple template to the creature; one of which is "Cthonic". This makes the creature into an earth creature, able to burrow through the earth.
Can you add this template to an aquatic animal such as a shark, and summon it on land? What are the interactions of having the earth subtype and an aquatic subtype?
"Creatures cannot be summoned into an environment that cannot support them." http://www.d20pfsrd.com/magic/all-spells/s/summon-monster/