Ghost Crab 29-V
ARTHROPODA
Pancrustacea
 
 
Ghost Crab
[Photo by George Harrison/USFWS]



Chapter Outline
  1. Description of Arthropoda
  2. Classification of Arthropoda
  3. Chelicerata
  4. Mandibulata
  5. Pancrustacea
  6. Hexapoda

Tree



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Pancrustacea is split into two groups: the subphylums Crustacea and Hexapoda. The classes of Crustacea are explored on this page while Hexapoda is on the next page.

  • Crustacea
    • Multicrustacea
      • Malacostraca
      • Hexanauplia
      • Thecostraca
    • Branchiopoda
    • Oligostraca
      • Ostracoda
      • Mystacocarida
      • Ichthyostraca
    • Cephalocarida
  • Hexapoda (next page)

Resources:

MALACOSTRACA10

The class containing Lobsters, Crayfish, Crabs, Shrimps and Pill Bugs (Roly Polies). As of 2024, 1,382 species of Malacostraca have been observed in iNaturalist in the US and 5,122 throughout the world.

  • SUBCLASS EUMALACOSTRACA
    • SUPERORDER EUCARIDA
      • ORDER DECAPODA
        • SUBORDER PLEOCYEMATA
          • INFRAORDER ACHELATA
          • INFRAORDER ANOMURA
            • Pacific Sand Crab (Emerita analoga) - Ecola SP, OR
            • Atlantic Sand Crab (Emerita talpoida) - 10 (Assateague)
            • Blueband Hermit Crab (Pagurus samuelis) - 7 (Monterey Bay)
          • INFRAORDER ASTACIDEA
            • Red Swamp Crayfish (Procambarus clarkii) - 10 (Chesapeake Bay region)
            • American Lobster (Homarus americanus) - 3 (Gulf of Maine)
            • Queensland Redclaw Yabby (Cherax quadricarinatus) - 6 (SCZ)
          • INFRAORDER BRACHYURA
            • Striped Shore Crab (Pachygrapsus crassipes) - most iNat observations in the US for Decapoda - 7 (Monterey Bay), Ecola SP, OR
            • Japanese Spider Crab (Macrocheira kaempferi) - 6 (Omaha Zoo)
            • Blue Crab (Callinectes sapidus) - 10 (Chesapeake Bay)
            • Atlantic Ghost Crab (Ocypode quadrata) - 10 (Assateague, Chesapeake Bay)
            • Erimacrus isenbeckii - FLKR FLKR
          • INFRAORDER CARIDEA
            • Lebbeus longimanus - FLKR
          • INFRAORDER POLYCHELIDA
          • INFRAORDER STENOPODIDEA
        • SUBORDER DENDROBRANCHIATA
      • ORDER EUPHAUSIACEA
        • North Pacific Krill (Euphausia pacifica) - most iNat observations in the US for Euphausiacea - 11 (Glacier Bay)
      • ORDER AMPHIONIDACEA
        • Sand Shrimp (Crangon septemspinosa) - most iNat observations in the US for Amphionidacea - 10 (Chesapeake Bay to NYC)
    • SUPERORDER HOPLOCARIDA
      • ORDER STOMATOPODA
        • West Atlantic Mantis Shrimp (Squilla empusa) - most iNat observations in the US for Stomatopoda - 10 (Delaware Bay, Assateague)
        • Zebra Mantis Shrimp (Lysiosquillina maculata) - Omaha Zoo
        • Peacock Mantis Shrimp (Odontodactylus scyllarus) - Omaha Zoo
    • SUPERORDER PERACARIDA
      • ORDER AMPHIPODA
        • California Beach Flea (Megalorchestia californiana) - most iNat observations in the US for Amphipoda - 7 (Monterey Bay)
      • ORDER CUMACEA
        • Hooded Shrimp (Eudorella pacifica)
      • ORDER ISOPODA
        • Pill Bug (Armadillidium vulgare) - most iNat observations in the US for Isopoda. Introduced. - Perry Lake, KS
        • Wood lice
        • Sea slaters
      • ORDER MICTACEA
      • MYSIDACEA
        • ORDER LOPHOGASTRIDA
        • ORDER MYSIDA
          • Chameleon Shrimp (Praunus flexuosus) - most iNat observations in the US for Mysida - 3 (Acadia)
          • Mysis oculata - FLKR (with marine leech attached)
      • ORDER SPELAEOGRIPHACEA
      • ORDER TANAIDACEA
      • ORDER THERMOSBAENACEA
    • SUPERORDER SYNCARIDA
  • SUBCLASS PHYLLOCARIDA
Resources:
HEXANAUPLIA5

The Class of Copepods and Minute-Crustacean Parasites. As of 2024, 102 species of Hexanauplia have been observed in iNaturalist in the US and 324 throughout the world. While there are around 13,000 species of copepods, relatively few are observed in iNaturalist.

  • SUBCLASS COPEPODA
    • INFRACLASS NEOCOPEPODA
      • SUPERORDER GYMNOPLEA
        • ORDER CALANOIDA
      • SUPERORDER PODOPLEA
        • ORDER CYCLOPOIDA
        • ORDER HARPACTICOIDA
        • ORDER MISOPHRIOIDA
        • ORDER MONSTRILLOIDA
        • ORDER POECILOSTOMATOIDA
        • ORDER SIPHONOSTOMATOIDA
          • Salmon Louse (Lepeophtheirus salmonis) - most iNat observations in the US for Copepoda - 5 (Olympic, on salmon)
    • INFRACLASS PROGYMNOPLEA
  • SUBCLASS TANTULOCARIDA
Resources:
THECOSTRACA 

The Class of Barnacles. As of 2024, 62 species of Thecostraca have been observed in iNaturalist in the US and 174 throughout the world.

  • SUBCLASS ASCOTHORACIDA
  • SUBCLASS CIRRIPEDIA
    • INFRACLASS ACROTHORACICA - burrowing barnacles
    • INFRACLASS RHIZOCEPHALA - parasitic barnacles
    • INFRACLASS THORACICA - barnacles
      • SUPERORDER PHOSPHATOTHORACIA
      • SUPERORDER THORACICALCARIA
        • ORDER BALANOMORPHA
          • Pacific Acorn Barnacle (Balanus glandula) - Ecola SP, OR
          • Pink Volcano Barnacle (Tetraclita rubescens) - 7 (Monterey Bay)
        • ORDER CALANTICOMORPHA
        • ORDER POLLICIPEDOMORPHA
          • Gooseneck Barnacle (Pollicipes polymerus) - most iNat observations in the US for Thecostraca - Ecola SP, OR
        • ORDER VERRUCOMORPHA
  • SUBCLASS FACETOTECTA
    • Hansenocaris itoi
Resources:
BRANCHIOPODA7

The class of Fairy Shrimps, Tadpole Shrimps and Water Fleas. As of 2024, 95 species of Branchiopoda have been observed in iNaturalist in the US and 220 throughout the world.

  • SUBCLASS PHYLLOPODA
    • ORDER DIPLOSTRACA
      • Water fleas, clam shrimps
      • California Clam Shrimp (Cyzicus californicus) - 7 (Monterey Bay, Central Valley)
    • ORDER NOTOSTRACA
      • Vernal Pool Tadpole Shrimp (Lepidurus packardi) - most iNat observations in the US for Branchiopoda. Endangered. - Silicon Valley, California's Central Valley
      • Longtail Tadpole Shrimp (Triops longicaudatus) - 7 (Death Valley, Nopah Range), 6 (Konza)
  • SUBCLASS SARSOSTRACA
    • ORDER ANOSTRACA
      • Mono Lake Brine Shrimp (Artemia monica) - 7 (Mono Lake), 1 (Great Salt Lake)
      • Springtime Fairy Shrimp (Eubranchipus vernalis) - 10 (Chesapeake Bay, Washington, DC and NYC)
Resources:
OLIGOSTRACA 

Oligostraca is the superclass containing mussel shrimps, mustache shrimps, fish lice and tongue worms. As of 2024, 10 species of Oligostraca have been observed in iNaturalist in the US and 18 throughout the world.

  • CLASS OSTRACODA
    • SUBCLASS MYODOCOPA
      • ORDER HALOCYPRIDA
      • ORDER MYODOCOPIDA
        • California Sea Firefly (Vargula tsujii) - 1 observation at Santa Catalina Island
    • SUBCLASS PODOCOPA
      • ORDER PLATYCOPIDA
      • ORDER PODOCOPIDA
        • Spinileberis hyalina - most iNat observations in the US for Oligostraca - San Francisco Bay
        • Cypridopsis vidua
  • CLASS MYSTACOCARIDA
    • Mustache Shrimp (Derocheilocaris typica) - the only observation of Mystacocarida in iNaturalist - 3 (Woods Hole)
  • CLASS ICHTHYOSTRACA
    • SUBCLASS BRANCHIURA
      • Fish Lice - no species of Branchiura observed in iNaturalist in the US and just 2 species worldwide
    • SUBCLASS PENTASTOMIDA
      • Tongue Worms - the 1 worldwide observation for Pentastomida was in the US near Fort Myers, FL
Resources:
CEPHALOCARIDA 

The class of horseshoe shrimps contains only one order and one family, Hutchinsoniellidae. There are just twelve known species in this class and none have been observed in iNaturalist.

Resources:

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