Oyster-reef
Guides
Panopeus
mud crabs
Panopeus is a genus of mud crabs in the family Panopeidae, distributed primarily in intertidal and estuarine environments of the Western Atlantic. Species within this genus exhibit sexual size dimorphism, with males typically larger than females, and show specialized habitat use patterns including vertical stratification within reef structures. Some species demonstrate extreme male-biased sexual size dimorphism driven by sexual antagonistic coevolution and coercive mating systems. Members of this genus are ecosystem engineers in mangrove and estuarine habitats, influencing sediment structure and energy flow.
Petrolisthes armatus
Green Porcelain Crab
Petrolisthes armatus, commonly known as the green porcelain crab, is a small porcellanid crab native to the southwestern Atlantic, particularly Brazil. The species has established invasive populations along the southeastern United States coast, where densities can exceed 30,000 individuals per square meter. Genetic studies confirm it as a single monophyletic species with exceptional geographic range spanning the Atlantic and eastern Pacific. It is frequently parasitized by the bopyrid isopod Aporobopyrus curtatus, which causes parasitic castration.
invasive-speciesfilter-feederparasite-hostintertidalporcelain-craboyster-reefsymbiosisplanktonic-larvaevisual-ecologycrustaceandecapodanomuraporcellanidaesouthwestern-atlanticeastern-pacificsoutheastern-united-statesbopyrid-parasiteAporobopyrus-curtatusestuarinemangrovesponge-symbiosisgaze-stabilizationachromatic-visionlarval-transportoyster-bedballast-wateraquaculturemonophyleticcryptic-species-complexparasitic-castrationzoeamegalopapleopodspermatophorechellipedcarapacegranulatedolive-greenblue-colorationFarol-IslandBrazilGeorgiaSouth-CarolinaFloridaPanamaCosta-RicaEcuadorPeruBaja-CaliforniaCaribbeanGulf-of-MexicoWest-IndiesAscension-IslandBermudaBahamasWest-Africarock-rubblesoft-sedimentshallow-subtidallower-intertidaldensity-30000-per-square-meter6-8-mm0.5-gorange-spotfour-segmented-chelipedantennae-outside-eyesvestigial-fourth-leg-pairfeathery-mouthpartszooplanktonscavengerpheromone-settlement-cue3-mm-sexual-maturity17%-parasite-prevalencebranchial-chamber-parasitesynchronous-growth-parasite-hostcastrationvisual-noisecaustic-flickerpolarization-sensitivityoptomotor-assaytidal-creekspectrally-narrow-environmentmitochondrial-DNAgenetic-variabilityexceptional-rangepre-Canal-Panama18591930s-Floridalineagewarm-temperate-Atlanticspecies-complexhalf-crabsquat-lobster-relativetrue-crabfalse-crabDecapodaMalacostracaArthropodaCrustaceaGibbes-1850Porcellana-armatagreen-porcelain-crabPetrolisthes-armatus