R

Class

Merostomata

Class Eurypterida

(sea scorpions)

extinct

Class

Arachnida

Subphylum Crustacea

Class

Maxillopoda

Class

Malacostraca

Subphylum Myriapoda

Subphylum Hexapoda c c

Order Xiphosura

(horseshoe crabs)

Order Scorpiones

(scorpions)

Order Acari

(ticks, mites)

Order Araneae

(spiders)

Class Branchiopoda

(brine shrimp, fairy shrimp, water fleas)

Class Ostracoda

(ostracods, seed shrimp)

Subclass Copepoda

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