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Basic characteristics of arachnids include four pairs of legs (1) and a body divided into two segments: the cephalothorax (2) and the abdomen (3). The ventral side of a brown widow spider. The epigastric plates and furrow are visible, as well as the hourglass marking on the underside of the abdomen, which is a characteristic feature of widow ...
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. [1] The terms prosoma and opisthosoma are equivalent to cephalothorax and abdomen in some groups.
Cephalothorax or prosoma: One of the two main body parts , located towards the anterior end, composed of the head (cephalic region or caput) and the thorax (thoracic region), the two regions being separated by the cervical groove; covered by the carapace and bearing the eyes, legs, pedipalps and mouthparts [3]
The spider's body is divided into two main parts: a rectangular, slightly rounded cephalothorax and larger ovoid abdomen that is narrower to the rear. [14] The male has a carapace , the hard upper part of the cephalothorax, [ 15 ] that is between 1.9 and 2.3 mm (0.07 and 0.09 in) long and 1.5 and 1.8 mm (0.06 and 0.07 in) wide.
In spiders, the cephalothorax and abdomen are joined by a small, cylindrical pedicel, which enables the abdomen to move independently when producing silk. The upper surface of the cephalothorax is covered by a single, convex carapace, while the underside is covered by two rather flat plates. The abdomen is soft and egg-shaped.
Once the spider is 3–4 cm from its prey, it leaps and pierces the prey with its fangs. If a fly or other prey appears behind the spider, the spider will turn around and begin stalking. If the prey moves during stalking, the spider will turn its cephalothorax so that it is pointed at the prey.
Evarcha praeclara is a small, light-coloured spider. Its body is divided into two main parts: a cephalothorax and an abdomen.The male has a high carapace, the hard upper part of the cephalothorax, that is between 2.1 and 2.4 mm (0.08 and 0.09 in) long and 1.6 and 2.0 mm (0.06 and 0.08 in) wide. [17]
Pachyballus miniscutulus is a species of jumping spider that is native to Ivory Coast and South Africa. It lives in open grassland and in vegetation near to streams. A very small spider, it has a cephalothorax that is ranges from 1 to 1.3 mm long and an abdomen that is between 1.7 and 1.9 mm long.