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The invasive and suspected non-native green porcelain crab Petrolisthes armatus is a small, flat crab that is usually orange-brown to dark brown as an adult, with a speckled and somewhat lighter appearance as juveniles. Individuals may also be olive green to dark green in color, giving rise to the common name. Mature specimens of both sexes have portions of their mouthparts pigmented brilliant blue. The chelae (pincers) are long and each possesses a distinct orange spot that is visible when they are open.As is characteristic for all porcelain crabs, the antennae are inserted external to the eyes, not between them as is observed in most other crab families (Knott and King undated, IRL Field Guide).

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© Smithsonian Marine Station at Fort Pierce

Source: Indian River Lagoon Species Inventory

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