Fully invariant submodules play an important designation in studying
the structure of some known modules such as (dual) Rickart and
(dual) Baer modules. In this work, we introduce

-dual Rickart
(Baer) modules via the concept of fully invariant submodules. It is
shown that

is

-dual Rickart if and only if

such
that

is a dual Rickart module. We prove that a module

is

-dual Baer if and only if

is

-dual Rickart and

has

for direct summands of

contained in

. We present a
characterization of right

-dual Baer rings where

is an ideal
of

. Some counter-examples are provided to illustrate new
concepts.