  Swirling topological spin configurations, known as magnetic skyrmions, are
known to be stabilised in chiral ferromagnets with Dzyaloshinskii-Moriya
interaction (DMI). In particular, for appropriate values of the external
magnetic field they appear in a topological crystalline phase, termed Skyrmion
crystal phase (SkX). A similar phenomenon is present in the antiferromagnetic
case, for the Heisenberg triangular antiferromagnet (HTAF) with DMI. Here, the
most striking feature is that the emergent topological phase consists of three
SkX interpenetrated sublattices. On the other hand, the pure HTAF, being
described by an SO(3) order parameter, can host Z2 vortices. This rises the
fundamental question on whether both non trivial structures are related. In
this paper we unravel a hidden connection between both topological entities by
studying the HTAF with anisotropic DMI. To this end, we combine an effective
field theory description, the Luttinger-Tisza approximation and Monte Carlo
simulations. We show that even a slight anisotropy in the DMI proves to be the
key ingredient to deform the interpenetrated SkX structure and reveal a
Z2-vortex crystal.
