  We prove obstructions to a strongly negative amphichiral knot bounding an
equivariant slice disk in the 4-ball using the determinant, Spinc-structures
and Donaldson's theorem. Of the 16 slice strongly negative amphichiral knots
with 12 or fewer crossings, our obstructions show that 8 are not equivariantly
slice, we exhibit equivariant ribbon diagrams for 5 others, and the remaining 3
are unknown. Finally, we give an obstruction to a knot being strongly negative
amphichiral in terms of Heegaard Floer correction terms.
