What is the function of mesothorax?

What is the function of mesothorax?

The mesothorax is the segment that bears the forewings in all winged insects, though sometimes these may be reduced or modified, as in beetles (Coleoptera) or Dermaptera, in which they are sclerotized to form the elytra (“wing covers”), and the Strepsiptera, in which they are reduced to form halteres.

What is gena in insect?

the area between the base of antennae, oral margin, eyes and cheeks (gena). It covers the upper part of the face above the clypeus and below and between the antennae. It supports the pharyngeal dilator muscles and usually bears an ocellus.

What are the segments of an insect?

Adult insects have segmented bodies divided into a head, a thorax and an abdomen. The head carries a single pair of antennae at the front and a pair of compound eyes on the side. The thorax is made up of three segments, each with a pair of jointed legs.

What is sulcus in insects?

There may also be a vertical sulcus from the eye to the subgenus sulcus called the subocular sulcus. The subocular sulcus acts as a brace against the pull of the muscles associated with feeding. – The anterior surface of the head lying between the compound eyes is called the frons.

What is sclerites of insect head?

The surface of the head is divided into regions (sclerites) by a pattern of shallow grooves (sutures). The uppermost sclerite (dorsal surface) of the head capsule is known as the vertex. The genae (“cheeks”) are lateral sclerites that lie behind the frontal sutures on each side of the head.

What are the appendages of the insect thorax?

The thorax consists of three segments called the pro-, meso-, and metathorax. Appendages used for movement are attached to the thorax. Each of the segments of the thorax bears one pair of legs and if wings are present they are found on the meso- and metathorax only. The top of the prothorax is called the pronotum.

What is the function of the tympanum in a grasshopper?

The tympanum is used for hearing. hind legs are used for jumping. side of the abdomen. that ends with a four pointed tip called an ovipositor.

Where are the setae found on an earthworm?

They are present in many different invertebrate lines. In this manner, where are setae found on an earthworm? Bristles, called setae, are located on each segment of the earthworm’s body. They prevent the earthworm from slipping backwards. Do earthworms have blood?

What is the function of annelid setae?

Annelid setae are stiff bristles present on the body. They help, for example, earthworms to attach to the surface and prevent backsliding during peristaltic motion. These hairs make it difficult to pull a worm straight from the ground.

What are the segments 14-16 of a mature earthworm?

The segments 14-16 of a matured earthworm consist of a glandular tissue called clitellum which helps us to distinguish the mouth and tail ends. The body is divided into three segments with respect to clitellum- preclitellar, clitellar and postclitellar. Earthworms are hermaphrodites i.e., they carry both male and female sex organs.

What is the structure of the epithelium of earthworms?

The epithelium consists of a single layer of glandular columnar epithelium. The alimentary canal is a long tube running from first to the last segment of the body. The food of earthworms is the leaves and decaying organic matters which are mixed with soil.