The PEDIGREE of
Infraphylum Chelicerata (Arachnids & Horseshoe Crabs)

 "Child(ren)":       Class Arachnida (Spiders & Scorpions)   ;   Class Merostomata (Horshoe Crabs & Sea Scorpions)   ;   Pycnogonida (sea spiders)   ;   extinct classes   ;   80000 living species (described)   ;   perhaps 700000 living species (undescribed)
________________________________________________________________________________________________________ 
/-- Superempire Unikonta   +====> [ 55]
/-- Empire of Opisthokonts (Fungi & Animals)
/-- Superkingdom Holozoa
/-- Kingdom of Animals
/-- Subkingdom of Metazoa (Multicellular Animals)
/-- Superbranch Eumetazoa
/-- Superphylum Planulozoa
/-- Clade of Bilateria and Placozoa
/   | (skip this generation?)
/-- Branch Bilateria
/-- Infrakingdom (Grade) of Coelomates  (570 M BC)
/   | (skip this generation?)
/-- Subgrade of Protostomia
/   | or: Clade Nephrozoa
/-- Superphylum Ecdysozoa (Arthropods, Roundworms, etc.)
/-- Supraphylum Panarthropoda
/-- Phylum Arthropoda
/-- Subphylum Arachnomorpha
/  
- Infraphylum Chelicerata (Arachnids & Horseshoe Crabs)
 

 
  ``1-Great Grandchildren:''       Suborder Opisthothelae   ;   Order Scorpiones (True Scorpions)   ;   Superorder Acariformes (Mites)   ;   Clade of Parasitiformes & Opilioacariformes   ;   Suborder Eurypterina
 

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FabPed Genealogy Vers. 80   ©   Jamie, 1997-2017