Tree of Life


Subphylum Crustacea Classification

Phylum Arthropoda


Members of Subphylum Crustacea (the Crustaceans) comprise a large group of arthropods. The group contains familiar popular marine food animals such as lobsters, crabs, shrimp. While mainly found in salt and freshwater environments, there are also terrestrial Crustacea such as woodlice and isopods. Crustaceans have three distinct body parts: head, thorax, and abdomen (also called a pleon). In some, the head and thorax are fused to form a cephalothorax. They have two pairs of antennae on the head, compound eyes, three pairs of mouthparts and a telson. Crustaceans often have a thick carapace on the top (dorsal) side that makes fossilization more likely; crabs and lobsters, for example, have a thicker exoskeleton containing calcium carbonate that is more readily fossilized.

Subphylum Crustacea
Common Name
Class Branchiopoda Phyllopoda Brine shrimp
Sarsostraca Fairy Shrimp
Class Remipedia Enantiopoda (extinct)
Cave dwelling blind shrimps
Class Cephalocarida Order Brachypoda Horseshow shrimps
Class Maxillopoda Several subclasses Barnacles and a large number of parasites
Class Ostracoda Myodocopa (note 1) Seed shrimp
Podocopa Seed shrimp
Malacostraca  Eumalacostraca
crabs, mole crabs, lobsters and true shrimps
Phyllocarida Phyllocarids
  Hoplocarida Mantis shrimp

Ostracods have extensive microfossil record dating from the Cambrian and having utility for biozonation studies of marine strata and as markers of paleoenvironments.