at op hor es ). ▁The ▁sub groups ▁consisted ▁of ▁C yst on ect ae , ▁Phys on ect ae , ▁and ▁Cal y cor ph ores . ▁C yst on ect ae ▁had ▁p neum at op hor es , ▁phys on ect ae ▁had ▁ne ct op hor es , ▁and ▁cal y cop hor es ▁had ▁both . ▁ ▁E uk ary otic ▁nuclear ▁small ▁sub unit ▁rib os om al ▁gene ▁ 1 8 S , ▁e uk ary otic ▁mit och ond rial ▁large ▁sub unit ▁rib os om al ▁gene ▁ 1 6 S , ▁and ▁trans cript ome ▁anal ys es ▁further ▁support ▁the ▁ph y log en etic ▁division ▁of ▁Si phon op hor ae ▁into ▁ 2 ▁main ▁cl ades : ▁C yst on ect ae ▁and ▁C odon op hora . ▁Sub orders ▁within ▁C odon op hora ▁include ▁Phys on ect ae ▁( cons isting ▁of ▁the ▁cl ades ▁Cal y cop hor ae ▁and ▁Eu phys on ect ae ), ▁Py ro ste ph idae , ▁and ▁A po lem i idae . ▁ ▁Sub order ▁Cal y cop hor ae ▁A by l idae ▁Ag ass iz , ▁ 1 8 6 2 ▁Cla us oph y idae ▁Tot ton , ▁ 1 9 6 5 ▁Di phy idae ▁Qu oy ▁& ▁Ga im ard , ▁ 1 8 2 7 ▁Hi pp op odi idae ▁K öl li ker , ▁ 1 8 5 3 ▁P ray idae ▁K