  I present a construction "a` la Chevalley" of affine supergroups associated
with simple Lie superalgebras of (classical) type D(2,1;a), for any possible
value of the parameter a - in particular, including non-integral values of a.
This extends the similar work performed in [R. Fioresi, F. Gavarini, "Chevalley
Supergroups", Memoirs of the AMS 215 (2012), no. 1014 - arXiv:0808.0785v8
[math.RA]], where all other simple Lie superalgebras of classical type were
considered. The case of simple Lie superalgebras of Cartan type is dealt with
in [F. Gavarini, "Algebraic supergroups of Cartan type", Forum Mathematicum (to
appear), 92 pages - arXiv:1109.0626v5 [math.RA], so this work completes the
program of constructing connected affine supergroups associated with any simple
Lie superalgebra.
