21 Insecta — Echinodermata 



Class Subcl Order 



Strepsiptera stylopids 



Hymenoptera bees, wasps, ants, sawflies, hornets, wood-wasps, 



ichneumon-flies, gall-wasps, velvet-ants, horntails, 



tarantula-hawks 



CH AETOGN ATH A 



arrow-worms 



SAGITTOIDEA 



Sagittoidea 



POGONOPHORA 



beard-worms 



POGONOPHORA 



Thecanephria 

 Athecanephria 



ECHINODERMATA 



echinoderms 



CRINOIDEA feather-stars, crinoids, sea-lilies 

 Articulata 



Isocrinida 



Cyrtocrinida 



Comatulida 

 ASTEROIDEA starfishes, sea-stars 



Phanerozonea 



Spinulosa 



Forcipulata 

 OPHIUROIDEA brittle-stars, sand-stars, basket-stars, serpent-stars 

 Myophiurida 



Ophiocystiida 



Aganasterida 



Phrynophiurida 



Laemophiurida 



Gnathophiurida 



Chilophiurida 

 ECHINOIDEA sea-urchins, heart-urchins, sand-dollars 

 Regularia 



Cidaroida 



Centrechinoida 



Exocycloida 



