Puneet Varma (Editor)


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Kingdom  Animalia
Subphylum  Crustacea
Scientific name  Anomura
Rank  Infraorder
Phylum  Arthropoda
Suborder  Pleocyemata
Higher classification  Pleocyemata
Length  Red king crab: 1.8 m
Anomura Palaeos Arthropods Crustacea Decapoda Anomura

Lower classifications  Hermit crab, Porcelain crab, Galatheoidea, Mole crabs, Hippoidea

Anomura gilligan

Anomura (sometimes Anomala) is 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).


Anomura Flora and Fauna Marine Flora and Fauna of Ranong Thailand

Brachyura and anomura zoea


Anomura httpsuploadwikimediaorgwikipediacommonsthu

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). The alternative 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.

Anomura Anomura Wikispecies

The group has been moulded by several instances of carcinisation – the development of a crab-like body form. Thus, the king crabs (Lithodidae), porcelain crabs (Porcellanidae) and hairy stone crab (Lomisidae) are all separate instances of carcinisation.

Anomura Crustacea the Higher Taxa Anomura Decapoda Eucarida Malacostraca

As decapods (meaning ten-legged), anomurans have ten pereiopods, but the last pair of these is reduced in size, and often hidden inside the gill chamber (under the carapace) to be used for cleaning the gills. Since this arrangement is very rare in true crabs (for example, the small family Hexapodidae), a "crab" with only eight visible pereiopods is generally an anomuran.

Anomura Anomura Families Porcellanidae

There is wide acceptance from morphological and molecular data that Anomura and Brachyura (true crabs) are sister taxa, together making up the clade Meiura.


The infraorder Anomura is divided into nine superfamilies:

The oldest fossil attributed to Anomura is Platykotta, from the NorianRhaetian (Late Triassic) Period in the United Arab Emirates.


Anomura Wikipedia