Stelo

If you have Polyspidrons, you can take off the pieces yellow-coloured above (which are all the trispidrons without head) to realize the shapes of Stelo :

                      

to Stelo

We can notice that the 12 pieces of Stelo cover an area 36 ; if we double its dimensions, we obtain a form with area 144 (36 x 2²), which we can realize by the pieces of Polyspidrons ; so every shape of Stelo can be a challenge of Polyspidrons :

ex : the shape 002 of Stelo corresponds to the challenge 062 of Polyspidrons.