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The first body segment (segment number 1) features both the earthworm's mouth and, overhanging the mouth, a fleshy lobe called the prostomium, which seals the entrance when the worm is at rest, but is also used to feel and chemically sense the worm's surroundings. Some species of earthworm can even use the prehensile prostomium to grab and drag ...
Earthworm with clitellum lablelled. Close-up of the clitellum of a Lumbricus rubellus. The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches that secretes a viscid sac in which eggs are stored. [1]
Pheretima is a genus of earthworms found mostly in New Guinea and parts of Southeast Asia. Species belonging to the genus Pheretima have a clitellum, which is a band of glandular tissue present on segments 14 to 16. Individuals are hermaphroditic and reproduction can be either sexual or parthenogenetic. Female genital pores lie on the ventral ...
However, 'earthworm' can be a source of confusion since, in most of the world, other species are more typical. For example, through much of the unirrigated temperate areas of the world, the "common earthworm" is actually Aporrectodea (=Allolobophora) trapezoides, which in those areas is a similar size and dark colour to L. terrestris.
Lumbricus terrestris, an earthworm White tentacles of Loimia medusa, a spaghetti worm. Worms are many different distantly related bilateral animals that typically have a long cylindrical tube-like body, no limbs, and usually no eyes.
Lumbricus rubellus, or the "red earthworm", ranges from 25 millimetres (0.98 in) ... Chemoreceptors can also be found on other parts of the organism's body. [2]
Octochaetus multiporus is pale pink in colour, with a translucent body wall and a purple streak that runs along the top midline of the body. [3] The clitellum (a glandular section on the wall of the body, which holds eggs) and length are also unique to the worm and help with identification as it can grow up to 300 millimetres (12 in) and can get a diameter of 10 millimetres (0.4 in). [3]
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.