Octagonal-small rhombicuboctahedral duoprism

The octagonal-small rhombicuboctahedral duoprism or osirco is a convex uniform duoprism that consists of 8 small rhombicuboctahedral prisms, 18 square-octagonal duoprisms, of two kinds and 8 triangular-octagonal duoprisms. Each vertex joins 2 small rhombicuboctahedral prisms, 1 triangular-octagonal duoprism, and 3 square-octagonal duoprisms.

The octagonal-small rhombicuboctahedral duoprism can be vertex-inscribed into a small prismated penteract.

This polyteron can be tetrahedrally alternated into a square-truncated tetrahedral duoalterprism, although it cannot be made scaliform. It can also be tetrahedrally edge-snubbed to create a truncated tetrahedral-square prismalterprismoid, which is also not scaliform.

Vertex coordinates
The vertices of an octagonal-small rhombicuboctahedral duoprism of edge length 1 are given by all permutations of the last three coordinates of:
 * $$\left(±\frac12,\,±\frac{1+\sqrt2}2,\,±\frac12,\,±\frac12,\,±\frac{1+\sqrt2}{2}\right),$$
 * $$\left(±\frac{1+\sqrt2}2,\,±\frac12,\,±\frac12,\,±\frac12,\,±\frac{1+\sqrt2}{2}\right).$$

Representations
An octagonal-small rhombicuboctahedral duoprism has the following Coxeter diagrams:
 * x8o x4o3x (full symmetry)
 * x4x x4o3x (octagons as ditetragons)