Anomura (sometimes Anomala) are a group of decapod crustaceans, including hermit crabs and others. Although the names of many anomurans includes the word crab, all true crabs are in the sister group to the Anomura, the Brachyura (the two groups together form the clade Meiura). Hermit crabs are decapod crustaceans of the infra-order Paguroidea, distinct from the true crabs in the infra-order Brachyura. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Bilateria Acoelomorpha Orthonectida Rhombozoa ? Myxozoa Superphylum Deuterostomia     Chordata (vertebrates, etc. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Orders Not necessarily a complete list: Leptostraca Stomatopoda Bathynellacea Thermosbaenacea Mysidacea Cumacea Amphipoda Isopoda Tanaidacea Euphausiacea Amphionidacea Decapoda Peracarida The Malacostraca are the largest subgroup of crustaceans, and include most of the animals that non-experts recognise as crustaceans, including the decapods (such as crabs, mole crabs, lobsters and true... Suborders Either suborders: Natantia Reptantia or suborders: Dendrobranchiata Pleocyemata The decapods or Decapoda are a group of crustaceans within the class Malacostraca. ... Infraorders Caridea Stenopodidea Reptantia, divided into: Polychelida Achelata Glypheoidea Astacidea Thalassinidea Anomala Brachyura Pleocyemata is a sub-order of decapod crustaceans, erected by Martin Burkenroad in 1963. ... Hermit crabs are decapod crustaceans of the infra-order Paguroidea, distinct from the true crabs in the infra-order Brachyura. ... Genera Birgus Coenobita Coenobitidae are a family of hermit crabs with only two genera: Birgus, the coconut crab, and Coenobita, a genus of terrestrial hermit crabs centred in the Indian and Pacific Oceans, but also extending to the Atlantic Ocean and the Red Sea. ... Spiny King Crab (Paralithodes rathbuni) King crab can refer to several species of arthropod: The horseshoe crab Two hermit crab genera in the in the superfamily Paguroidea: Lithodes, including the species: Scarlet king crab, Lithodes couesi (Benedict, 1894) † Golden king crab, Lithodes aequispinus (an Alaska king crab) †† Paralithodes, including the... Suborders Either suborders: Natantia Reptantia or suborders: Dendrobranchiata Pleocyemata The decapods or Decapoda are a group of crustaceans within the class Malacostraca. ... Classes Remipedia Cephalocarida Branchiopoda Ostracoda Maxillopoda Malacostraca The crustaceans (Crustacea) are a large group of arthropods (55,000 species), usually treated as a subphylum. ... Hermit crabs are decapod crustaceans of the infra-order Paguroidea, distinct from the true crabs in the infra-order Brachyura. ... Sections Dromiacea Raninoida Heterotremata Thoracotremata The term crab is sometimes applied to several different groups of short (nose to tail) decapods with thick exoskeletons, but only members of the Brachyura are true crabs; other taxa, such as hermit crabs, porcelain crabs, king crabs, and horseshoe crabs are, despite superficial similarities... Greek clados = branch) or phylogenetic systematics is a branch of biology that determines the evolutionary relationships of living things based on derived similarities. ...

The Infraorder Anomura is divided into four superfamilies:

• Lomisoidea - contains a single family, which contains a single species - Lomis hirta, the Hairy Stone Crab
• Hippoidea - containing the two families of mole crabs, Hippidae and Albuneidae
• Galatheoidea - containing squat lobsters and related animals in four families: Galtheidae (squat lobsters), Chirostylidae (squat lobsters), Porcellanidae (porcelain crabs) and Aeglidae (a small group of South American freshwater anomurans with no common name in English).
• Paguroidea - hermit crabs and their relatives: Coenobitidae, Diogenidae, Paguridae, Parapaguridae, Pylochelidae, and the king crabs or stone crabs in the Lithodidae)

The name Anomala reflects the unusual variety of forms in this group; whereas all crabs share some obvious similarities, the various groups of anomurans are quite dissimilar. The name Anomura derives from an old classification in which reptant decapods were divided into Macrura (long-tailed), Brachyura (short-tailed) and Anomura (differently-tailed). Binomial name Emerita talpoida Say, 1817 Mole crabs (Emerita talpoida and a number of related species) are clawless oval-shaped crustaceans found on the Atlantic coast of North America. ... South America South America is a continent crossed by the equator, with most of its area in the Southern Hemisphere. ... For the village on the Isle of Wight, see Freshwater, Isle of Wight. ... Hermit crabs are decapod crustaceans of the infra-order Paguroidea, distinct from the true crabs in the infra-order Brachyura. ... Hermit crabs are decapod crustaceans of the infra-order Paguroidea, distinct from the true crabs in the infra-order Brachyura. ... Spiny King Crab (Paralithodes rathbuni) King crab can refer to several species of arthropod: The horseshoe crab Two hermit crab genera in the in the superfamily Paguroidea: Lithodes, including the species: Scarlet king crab, Lithodes couesi (Benedict, 1894) † Golden king crab, Lithodes aequispinus (an Alaska king crab) †† Paralithodes, including the...