  In the present paper, we introduce screen transversal lightlike submanifolds
of metallic semi-Riemannian manifolds with its subclasses, namely screen
transversal anti-invariant, radical screen transversal and isotropic screen
transversal lightlike submanifolds, and give an example. We show that there do
not exist co-isotropic and totally screen transversal type of screen
transversal anti-invariant lightlike submanifolds of a metallic semi-Riemannian
manifold. We investigate the geometry of distributions involved in the
definition of such submanifolds and the conditions for the induced connection
to be a metric connection. Furthermore, we give a necessary and sufficient
condition for an isotropic screen transversal lightlike submanifold to be
totally geodesic.
