The cephalothorax is an anatomical term used of arachnid and malacostracan arthropods for the first major body section. It is derived from the fusion of the head (cephalon) and the trunk (thorax), and therefore includes all the mouthparts, antennae, and the thoracic appendages, such as the legs of a spider or lobster. The remainder of the body is the abdomen, which may also bear lateral appendages as well as the tail, if present. In the Malacostraca, the cephalothorax is typically covered by protective carapace. Anatomical drawing of the human muscles from the Encyclopédie. ... Orders Acarina Amblypygi Araneae Opiliones Palpigradi Pseudoscorpionida Ricinulei Schizomida Scorpiones Solifugae Uropygi The arachnids, Arachnida, are a class of invertebrate animals in the subphylum Chelicerata. ... 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... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Fusion may refer to: the merging of two or more entities into a single one For the combining of two atomic nuclei into a single nucleus (with possible emission of radioactivity), see nuclear fusion cold fusion refers to a controversial form of nuclear fusion which has recently (April/May 2005... 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. ... 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. ... Families Suborder Mesothelae     Liphistiidae (primitive burrowing spiders)     Arthrolycosidae (primitive spiders)     Arthromygalidae (primitive spiders) Suborder Mygalomorphae     Antrodiaetidae (folding trapdoor spider)     Atypidae (atypical tarantula)     Ctenizidae (trapdoor spider)     Cyrtaucheniidae (wafer trapdoor spider)     Dipluridae (funnel-web tarantula)     Hexathelidae (venomous funnel-web tarantula)     Mecicobothriidae (dwarf tarantulas)     Theraphosidae (tarantula) Suborder Araneomorphae     Agelenidae (araneomorph funnel-web spider... Subfamilies and Genera Neophoberinae Acanthacaris Thymopinae Nephropsis Nephropides Thymops Thymopsis Nephropinae Homarus Nephrops Homarinus Metanephrops Eunephrops Thymopides Clawed lobsters comprise a family (Nephropidae, sometimes also Homaridae) of large marine crustaceans. ... The human abdomen (from the Latin word meaning belly) is the part of the body between the pelvis and the thorax. ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... The term carapace refers to a dorsal section of an exoskeleton or shell, in a number of animal groups. ...