Does every equational theory have an independent equational axiomatization?

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An equational theory is a theory axiomatized by a set of equations. Does every such theory have an independent equational axiomatization? Independent means no axiom in the set can be deleted without loss of theorems.

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No.

Finite algebras with no independent basis of identities,
I. M. ISAEV,
Algebra univers. 37 (1997) 440-444

describes a finite algebra whose equational theory has no independent equational axiomatization. The algebra is a finite dimensional vector space over a finite field equipped with a certain nonassociative bilinear multiplication.