▁by ▁replacing ▁both ▁squares ▁of ▁a ▁square ▁anti pr ism ▁with ▁a ▁square ▁py ram id . ▁ ▁The ▁sn ub ▁dis phen oid ▁( J 8 4 ) ▁is ▁another ▁del t ah ed ron , ▁constructed ▁by ▁replacing ▁the ▁two ▁squares ▁of ▁a ▁square ▁anti pr ism ▁by ▁pairs ▁of ▁equ il ater al ▁tri angles . ▁The ▁sn ub ▁square ▁anti pr ism ▁( J 8 5 ) ▁can ▁be ▁seen ▁as ▁a ▁square ▁anti pr ism ▁with ▁a ▁chain ▁of ▁equ il ater al ▁tri angles ▁inserted ▁around ▁the ▁middle . ▁The ▁s phen oc or ona ▁( J 8 6 ) ▁and ▁the ▁s phen om eg ac or ona ▁( J 8 8 ) ▁are ▁other ▁Johnson ▁sol ids ▁that , ▁like ▁the ▁square ▁anti pr ism , ▁consist ▁of ▁two ▁squares ▁and ▁an ▁even ▁number ▁of ▁equ il ater al ▁tri angles . ▁ ▁The ▁square ▁anti pr ism ▁can ▁be ▁trunc ated ▁and ▁altern ated ▁to ▁form ▁a ▁sn ub ▁anti pr ism : ▁ ▁Sym met ry ▁mut ation ▁As ▁an ▁anti pr ism , ▁the ▁square ▁anti pr ism ▁belongs ▁to ▁a ▁family ▁of ▁poly hed ra ▁that ▁includes ▁the ▁oct ah ed ron ▁( which ▁can ▁be ▁seen ▁as ▁a ▁triangle - c apped ▁anti pr ism ), ▁the ▁pent ag onal ▁anti pr ism , ▁the ▁hex ag onal ▁anti pr ism , ▁and ▁the ▁oct ag onal ▁anti pr ism . ▁ ▁The ▁square ▁anti pr ism ▁is ▁first ▁in