Identify the primary jurisprudential basis underlying the differing opinions between the Hanafi and Shafi'i schools regarding the permissibility of consuming marine crustaceans.

The primary jurisprudential basis underlying the differing opinions between the Hanafi and Shafi'i schools regarding the permissibility of consuming marine crustaceans stems from their divergent interpretations of relevant Islamic texts concerning the definition of what constitutes a permissible sea creature and the broader principles of what is *halal(permissible) versus *haram(impermissible) in food from the ocean.