Earthworms | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-13

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Earthworm


00:02:45 1 Anatomy
00:02:54 1.1 Form and function
00:07:55 1.2 Nervous system
00:08:17 1.2.1 Central nervous system
00:10:27 1.2.2 Peripheral nervous system
00:11:01 1.2.3 Sympathetic nervous system
00:11:43 1.2.4 Movement
00:14:40 1.3 Photosensitivity
00:15:40 1.4 Digestive system
00:17:41 1.5 Circulatory system
00:19:11 1.6 Excretory system
00:20:22 1.7 Respiration
00:20:54 2 Life and physiology
00:21:29 2.1 Reproduction
00:24:38 2.2 Locomotion
00:25:48 2.3 Regeneration
00:28:14 3 Taxonomy and distribution
00:32:06 3.1 As an invasive species
00:32:30 4 Ecology
00:37:50 4.1 Environmental impacts
00:43:41 5 Economic impact
00:45:06 6 See also



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SUMMARY
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An earthworm is a tube-shaped, segmented worm found in the phylum Annelida. They have a world-wide distribution and are commonly found living in soil, feeding on live and dead organic matter. An earthworm's digestive system runs through the length of its body. It conducts respiration through its skin. It has a double transport system composed of coelomic fluid that moves within the fluid-filled coelom and a simple, closed blood circulatory system. It has a central and a peripheral nervous system. The central nervous system consists of two ganglia above the mouth, one on either side, connected to a nerve cord running back along its length to motor neurons and sensory cells in each segment. Large numbers of chemoreceptors are concentrated near its mouth. Circumferential and longitudinal muscles on the periphery of each segment enable the worm to move. Similar sets of muscles line the gut, and their actions move the digesting food toward the worm's anus.Earthworms are hermaphrodites: each individual carries both male and female sex organs. As invertebrates, they lack either an internal skeleton or exoskeleton, but maintain their structure with fluid-filled coelom chambers that function as a hydrostatic skeleton.
"Earthworm" is the common name for the largest members of Oligochaeta (which is either a class or a subclass depending on the author). In classical systems, they were placed in the order Opisthopora, on the basis of the male pores opening posterior to the female pores, though the internal male segments are anterior to the female. Theoretical cladistic studies have placed them, instead, in the suborder Lumbricina of the order Haplotaxida, but this may again soon change. Folk names for the earthworm include "dew-worm", "rainworm", "night crawler", and "angleworm" (due to its use as fishing bait).
Larger terrestrial earthworms are also called megadriles (which translates to "big worms"), as opposed to the microdriles ("small worms") in the semiaquatic families Tubificidae, Lumbricidae, and Enchytraeidae, among others. The megadriles are characterized by having a distinct clitellum (which is more extensive than that of microdriles) and a vascular system with true capillaries.