What is a fused head and thorax called?

What is a fused head and thorax called?

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.

What is the structure of a spider?

Unlike an insect, the spider’s body is in two sections. The head and thorax, bearing the eyes, mouthparts and legs, are fused together to form the cephalothorax.

How many parts does a spider have?

All spiders have 8 legs, 2 body parts (cephalothorax and abdomen), fang-like “chelicerae,” and antenna-like “pedipalps.” Click on the terms below to learn more about each body part. The cephalothorax is the first of 2 body parts on a spider.

What is Opisthosoma and Prosoma?

The opisthosoma is the posterior part of the body in some arthropods, behind the prosoma (cephalothorax). Although it is similar in most respects to an abdomen (and is often referred to as such), the opisthosoma is differentiated by its inclusion of the respiratory organs (book lungs or book gills) and the heart.

Does Spider have a heart?

Spiders, like most arthropods, have an open circulatory system, i.e., they do not have true blood, or veins which transport it. Rather, their bodies are filled with haemolymph, which is pumped through arteries by a heart into spaces called sinuses surrounding their internal organs.

Are spinnerets found in the abdominal end of female spiders?

The study of spiders is known as arachnology. All spiders produce silk, a thin, strong protein strand extruded by the spider from spinnerets most commonly found on the end of the abdomen. Many species use it to trap insects in webs, although there are many species that hunt freely.

What is the difference between an insect and a spider?

Insects fall under the class Insecta while spiders fall under the Arachnida class. An insect has six legs, two compound eyes, three body parts (head, thorax, and segmented abdomen), two antennae, and generally four wings.