Crab: World's greatest crab encyclopediaDatabase contains

World's greatest crab encyclopediaDatabase contains: 11.231 species (1.101 with photo), 1.749 genera, 126 families Learn about crabs, the hard-shelled arthropods with 10 legs and claws. Discover the different types of crabs, their habitats, diets, behaviors, and conservation status. Crab (Pachygrapsus marmoratus) on Istrian coast, Adriatic Sea Crabs attract a mate through chemical (pheromones), visual, acoustic, or vibratory means. Pheromones are used by most fully aquatic crabs, while terrestrial and semiterrestrial crabs often use visual signals, such as fiddler crab males waving their large claws to attract females. The vast number of brachyuran crabs have internal fertilisation and mate belly-to-belly. For many aquatic species, mating takes place just after the ... When you think of crabs, what comes to your mind? Check out these 7 characteristics of crabs that might get you surprised.