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It is located near the anterior end of the body, between the fourteenth and seventeenth segments. The number of the segments to where the clitellum begins and the number of segments that make up the clitellum are important for identifying earthworms. [2] In microdrile earthworms, the clitellum has only one layer, resulting in a smaller quantity ...
The difference between the unmodified and modified forms is evident when comparing the body wall of a caterpillar (unmodified) to a beetle (modified). From the embryonic stages, a layer of columnar or cuboidal epithelial cells gives rise to the external cuticle and an internal basement membrane.
The micropyle is situated on top in eggs which are globular, conical, or cylindrical; in those eggs which are flattened or lenticular, the micropyle is located on the outer margin or rim. [18] [62] The eggs of Lepidoptera are usually rounded and small (1 mm) though they may be as large as 4 mm in the case of Sphingidae and Saturniidae.
A crossvein between the radius and cubitus near the base of the wing in certain insects. areola 1. A small ring of color 2. In crayfish, the hourglass pattern on the dorsal surface of the cephalothorax [2] arolium A pad-like median lobe between the tarsal claws. base / basal area of wing Region close to the point of attachment to the thorax.
An insect uses its digestive system to extract nutrients and other substances from the food it consumes. [3]Most of this food is ingested in the form of macromolecules and other complex substances (such as proteins, polysaccharides, fats, and nucleic acids) which must be broken down by catabolic reactions into smaller molecules (i.e. amino acids, simple sugars, etc.) before being used by cells ...
The eggs are usually few in number, and the embryos have enough food to go through full fetal development in most groups. [7] Macrolecithal eggs are only found in selected representatives of two groups: Cephalopods and vertebrates. [7] [22] Macrolecithal eggs go through a different type of development than other eggs.
When it is attached near the base of the metatarsus it is termed incumbent, and when projecting from a higher portion of the metatarsus (as in rails), it is termed elevated. The hallux is a bird's first digit , in many birds being the sole rear-facing toe (including in most passerine species that have anisodactylous feet) and is homologous to ...
The mesothelium is made of modified epitheliomuscular cells; [8] in other words, their bodies form part of the epithelium but their bases extend to form muscle fibers in the body wall. [38] The mesothelium may also form radial and circular muscles on the septa, and circular muscles around the blood vessels and gut.