P: Echinodermata

SubP: Echinozoa

C: Holothuroidea

Example: Sea cucumbers

P: Echinodermata

SubP: Echinozoa

C: Echinoidea

SubC: Irregulari

Example: Sea biscuits, Sand dollars, heart urchins

P:Echinodermata

SubP: Echinozoa

C: Echinoidea

SubC: Regularia

E: Regular sea urchins

P: Echinodermata

SubP: Asterozoa

C: Asteroidea

E: Sea stars

P:Echinodermata

SubP: Asterozoa

C: Ophiuroidea

E: Brittle stars

P: Echinodermata

SubP: Crinozoa

C: Crinoidea

E: Sea lilies

P: Arthropoda

SubP: Chelicerata

C: Arachnida

O: Acari

E: Mites and ticks

P: Arthropoda

SubP: Chelicerata

C: Arachnida

O: Opilones

E: harvestmen

P: Arthropoda

SubP: Chelicerata

C: Arachnida

O:Araneae

E: spiders

P: Arthropoda

SubP: Chelicerata

C: Arachnida

O: Scorpiones

E: Scorpions

P: Arthropoda

SubP: Chelicerata

C: Arachnida

O: Euripterida

E: Giant water scorpion

P: Arthropoda

SubP: Chelicerata

C: Xiphosura

E: Horse-shoe crab