They have one pair of eyes at the front of the cephalothorax and three on each side of the head, a pattern also found in scorpions.

When a spider bites, the two parts of the chelicerae come together like a folding knife, and when making a threat display or actually preparing to bite, the spider will open the angle of the fangs with the basal portion of chelicerae and also open the angle of the basal portion with the cephalothorax.

They also have two dark bands running down either side of the cephalothorax.

Variations also exist whose abdomen, cephalothorax, or entire body is brown, sometimes with a dull red or yellow stripe, or cream-coloured spots on its upper side.

They also contain traces of a wide array of hydrolytic enzymes such as proteases, carbohydrases, nucleases and phospholipases, which are concentrated in the digestive gland in the cephalothorax of the krill.

A waist is present on the cephalothorax, and often also on the opisthosoma.

Chelicerates ' bodies consist of two tagmata, sets of segments that serve similar functions: the foremost one, called the cephalothorax or prosoma, is a complete fusion of the segments that in an insect would form two separate tagmata, the head and thorax ; the rear tagma is called the abdomen or opisthosoma.

Their body is organized into two tagmata called the prosoma, or cephalothorax, and the opisthosoma, or abdomen.

In horseshoe crabs and many crustaceans, a hard shell called the carapace covers the cephalothorax.

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.

The prosoma ( cephalothorax ) is divided into three regions, each covered by plates, the large protopeltidium and the smaller, paired, mesopeltidia and metapeltidia.

As in the Araneae, the body in the Opiliones has two tagmata, the anterior cephalothorax or prosoma, and the posterior ten-segmented abdomen or opisthosoma.

Mites are arachnids and, as such, evolved from a segmented body with the segments organised into two tagmata: a prosoma ( cephalothorax ) and an opisthosoma ( abdomen ).

The prosoma or cephalothorax is the anterior tagma, and the ten-segmented abdomen or opisthosoma is the posterior part.

The alternative name " cephalothorax " reflects the fact that the prosoma includes the parts that in insects form the head plus the thorax.

( The terms prosoma and opisthosoma are equivalent to cephalothorax and abdomen in some groups.

The carapace ( cephalothorax or prosoma ) is orange and the abdomen ( opisthosoma ) light gray.

The head and thorax may be fused together to form a cephalothorax, which may be covered by a single large carapace.

Lobster anatomy includes the cephalothorax which fuses the head and the thorax, both of which are covered by a chitinous carapace, and the abdomen.

Except where secondarily lost, shrimp have one pair of stalked eyes, although they are sometimes covered by the carapace, which protects the cephalothorax.

The carapace grows from the thorax to cover the cephalothorax, and extends forwards between the eyes into a rostrum.

The cephalothorax is derived from the fusion of the cephalon ( head ) and the thorax, and is usually covered by a single, unsegmented carapace.

In crustaceans, the carapace is a part of the exoskeleton that covers the cephalothorax.

The carapace functions as a protective cover over the cephalothorax.

In Opiliones, some authors prefer to use the term carapace interchangeably with the term cephalothorax, which is incorrect usage, because carapace refers only to the dorsal part of the exoskeleton of the cephalothorax.

The cephalothorax is covered with a thick carapace, which may extend forwards in front of the eyes to form a rostrum ; this is highly variable among squat lobsters, being vestigial in Chirostylus, wide and often serrated in some genera, and long, narrow, and flanked with " supraorbital spines " in others.

A carapace covers the animal's cephalothorax, while the abdomen is long and segmented, ending in a broad tail fan.

The carapace covering the cephalothorax is almost hairless and appears smooth and glossy.

Scorpions have two eyes on the top of the cephalothorax, and usually two to five pairs of eyes along the front corners of the cephalothorax.

The position of the eyes on the cephalothorax depends in part on the hardness or softness of the soil upon which they spend their lives.

The cephalothorax is formed in the embryo by fusion of the acron, which carries the eyes, with segments two to seven, which all have paired appendages, while segment one is lost during the embryo's development.

All have six eyes arranged in three groups of two ( diads ) and the violin spiders are usually brownish with a darker brown characteristic violin marking on the cephalothorax.

A cephalothorax and much smaller abdomen make up the extremely reduced body of the pycnogonid, which has up to two pairs of dorsally located simple eyes on its non-calcareous exoskeleton, though sometimes the eyes can be missing, especially among species living in the deep oceans.

The courtship ritual can involve several other behaviours such as juddering and a cheliceral kiss, in which the male's chelicerae – pincers – grasp the female's in a smaller more intimate version of the male's grasping the female's pedipalps and in some cases injecting a small amount of his venom into her pedipalp or on the edge of her cephalothorax, probably as a means of pacifying the female.

Segment two has a pair of chelicerae, small appendages that often form pincers, segment three has a pair of pedipalps that in most sub-groups perform sensory functions, while the remaining four cephalothorax segments have pairs of legs.

The chelicerae consist of a base segment that articulates with the cephalothorax and a fang portion that articulates with the base segment.

The glands that produce this venom are located in the two segments of the chelicerae, and, in most spiders, extend beyond the chelicerae and into the cephalothorax.

The chelicerae are shown in black, the surface of the cephalothorax in brown, the legs in reddish brown, and the venom glands and surrounding muscle tissue in green.

The spider relies more on palps, sensory structures just behind the chelicerae on the cephalothorax, to sense its environment.

The cephalothorax is elongate, with long chelicerae projecting forward in males.

The body of a scorpion is divided into three parts ( tagmata ): the head ( cephalothorax ), the abdomen ( mesosoma ) and the tail ( metasoma ).

The body of a decapod crustacean, such as a crab, lobster, or prawn, is made up of twenty body segments grouped into two main body parts, the cephalothorax and the abdomen.

The decapod crustacean, such as a crab, lobster, shrimp or prawn, is made up of nineteen body segments grouped into two main body parts, the cephalothorax and the abdomen.