Inside of an earthworm - Science Learning Hub
Earthworms have a simple nervous system. The cerebral ganglion is connected to a ventral nerve cord that runs the length of the body. Each segment is connected to this cord, allowing earthworms to move and respond to light, touch, chemicals, vibrations and more. Acknowledgement: Sara L Roggemann, Three Flowers Photography.
Earthworm - Wikipedia
An earthworm is a soil-dwelling terrestrial invertebrate that belongs to the phylum Annelida.The term is the common name for the largest members of the class (or subclass, depending on the author) Oligochaeta.In classical systems, they were in the order of Opisthopora since the male pores opened posterior to the female pores, although the internal male segments are anterior …
Earthworm - National Geographic Kids
Although native to Europe, earthworms are found throughout North America and western Asia. They do not live in deserts or regions where there is permafrost or permanent snow and ice. Typically only a few inches (7 or 8 centimeters) long, some members of this species have been known to grow to a snakelike 14 inches (35 centimeters). Earthworms' bodies are made up of …
Outside of an earthworm — Science Learning Hub
2012年6月12日 · The first segment on the earthworm’s anterior holds the prostomium and mouth. The prostomium, resembling a lip, is in front of the mouth. Earthworms use their pharynx to pull food into their mouths. Acknowledgement: Giles san Martin. Skin. Earthworms breathe and lose moisture through the skin. Light-sensitive cells are scattered in their skin.
Earthworm - Morphology, Diagram and Anatomy of Earthworm
Earthworm: Morphology And Anatomy. An earthworm is a segmented worm; a terrestrial invertebrate belonging to the phylum Annelida. They are the common inhabitants of moist soil and feed on organic matter. Earthworms are commonly called as farmer’s friend. This is because the worm casting (faecal deposit) increases the fertility and burrowing ...
Anatomy of Earthworm (With Diagram) | Zoology - Biology …
External Anatomy of Earthworm: The body of Pheretima is nearly circular in cross-section and varies from 7 to 8 inches (18-19 cms) in length. The general colour of the body is brown but the dorsal surface is darker. A dark line extends from end to end in the mid-dorsal line. The anterior end of the body is pointed and the posterior end is blunt.
Earthworm Anatomy - HowStuffWorks
Breathing through its skin is one. An earthworm lacks any kind of lungs, but like any other aerobic organism, it still needs oxygen to carry out essential processes and to rid itself of carbon dioxide that builds up as waste. Instead of inhaling and exhaling like us, the exchange of these gases in and out of the earthworm takes place passively ...
Earthworm | Annelid, Burrowing & Soil Fertility | Britannica
earthworm, any one of more than 1,800 species of terrestrial worms of the class Oligochaeta (phylum Annelida)—in particular, members of the genus Lumbricus. Seventeen native species and 13 introduced species (from Europe) occur in the eastern United States, L. terrestris being the most common. Earthworms occur in virtually all soils of the world in which the moisture and …
Learn Worm Anatomy and Biology | Great Lakes Worm Watch
General Earthworm Diagram. The clitellum of adult earthworms contains features called genital tumescence, tubercula pubertatis.The clitellum features and the male pores and female pores found above the clitellum and are all parts of the earthworm reproductive system. The prostomium is the earthworm mouth. The setae are tiny hair-like projections that are arranged …
anatomy - WormWatch
The following image illustrates earthworm anatomy: Figure 1: Anatomy of an earthworm. The first segment of the earthworm, the peristomium (see figure 1), contains the mouth.There is a small tongue-like lobe just above the mouth called the prostomium (see figure 1).Earthworms use the prostomium to see their environment, as earthworms have no eyes, ears, nose or hands.