Antennules

Pereiopods

Carapace

Pleopods

Uropods

Telson

The body of a decapod crustacean is made up of nineteen body segments grouped into two main body parts, the cephalothorax and the abdomen. Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. They are, from head to tail: 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. ... The cephalothorax is an anatomical term used of arachnid and malacostracan arthropods for the first major body section. ... The abdomen (from the Latin word meaning belly) is the part of the body between the pelvis and the thorax. ... An appendage is, in general, an external body part that projects from the body, or a natural prolongation or projection from a part of any organism. ...

Cephalothorax

Head

1. antennules
2. antennae
3. mandibles
4. first maxillae
5. second maxillae

The head also bears the (usually stalked) compound eyes. Antennae (singular antenna), are the paired appendages connecting to the first (and in crustaceans also to the second) segment of the head of the members of all subphyla of the arthropods except Chelicerata. ... Compound eye of a dragonfly A compound eye is a visual organ found in certain arthropods (some insects and crustaceans). ...

Thorax

1. first maxillipeds
2. second maxillipeds
3. third maxillipeds
4. first pereiopods
5. second pereiopods
6. third pereiopods
7. fourth pereiopods
8. fifth pereiopods

Maxillipeds are legs modified to function as mounthparts. Particularly in the less advanced decapods, these can be very similar to the pereiopods. Pereiopods are primarily walking legs and are also used for gathering food. Those pereiopods which are armed with a claw (chela) are sometimes referred to as chelipeds. The pereiopods which bear the sexual organs, which are the third pereiopod in the female and the fifth pereiopod in the male, may be referred as as gonopods. Each appendage from the second maxilla to the fifth pereiopod also bears a gill. In the Anomala (hermit crabs and related animals), the fifth pair of pereiopods is often hidden inside the branchial chamber, where they are used to clean the gills. The cephalothorax is covered by a carapace which protects the internal organs and the gills; the section of the carapace that projects in front of the eyes is called the rostrum. In aquatic organisms, gills are a respiratory organ for the extraction of oxygen from water and for the excretion of carbon dioxide. ... Superfamilies Lomisoidea Lomisidae Paguroidea Coenobitidae Diogenidae Lithodidae Paguridae Parapaguridae Galatheoidea Aeglidae Chirostylidae Galatheidae Porcellanidae Hippoidea Albuneidae Hippidae Anomura (sometimes Anomala) are a group of decapod crustaceans, including hermit crabs and others. ... Hermit crabs are decapod crustaceans of the infra-order Paguroidea, distinct from the true crabs in the infra-order Brachyura. ... The term carapace refers to a dorsal section of an exoskeleton or shell, in a number of animal groups. ... In aquatic organisms, gills are a respiratory organ for the extraction of oxygen from water and for the excretion of carbon dioxide. ...

Abdomen / Pleon

1. first pleopods
2. second pleopods
3. third pleopods
4. fourth pleopods
5. fifth pleopods
6. uropods

Pleopods are primarily swimming legs, and are also used for brooding the eggs (except in prawns). At the end of the abdomen, a pair of biramous uropods are used for steering, and in the "caridoid escape reaction", along with the telson, which bears the anus. In crabs and some other carcinised decapods, the abdomen is folded under the cephalothorax. Prawns are edible, shrimp-like crustaceans. ... The telson is the last division of the body of a crustacean. ... Male Anatomy The anus, in anatomy, is the external opening of the rectum. ... 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...