Morphology And Anatomy Of Earthworm Ppt To Pdf


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Earthworm - Lampito mauritii.

An earthworm is a terrestrial invertebrate that belongs to the phylum Annelida. They exhibit a tube-within-a-tube body plan , are externally segmented with corresponding internal segmentation, and usually have setae on all segments. It has a double transport system made of coelomic fluid that moves within the fluid-filled coelom and a simple, closed circulatory system.

Earthworm Anatomy and Dissection Guide

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Show More. No Downloads. Views Total views. Actions Shares. No notes for slide. Earthworm 1. In the gardens, they can be tracedby their faecal deposits known as wormcastings. MorphologyEarthworms have long cylindrical body. The body isdivided into more than hundred short segments whichare similar metameres about in number. Dorsal Surface: The dorsal surface of the body ismarked by a dark median mid dorsal line dorsal bloodvessel along the longitudinal axis of the body.

Ventral Surface: The ventral surface is distinguishedby the presence of genital openings pores. The firstbody segment is called the peristomium buccalsegment which contains the mouth. Setae can be extended or retracted. Theirprincipal role is in locomotion 7. This matter is as complex as it is interesting, so put your mind in low gear and hold on Heres a drawing to help you keep oriented:First of all, not every earthworm segment bears sex organs.

Counting from thefront, the worms male sex cells lie in segments 10 and From here thesperm pass through sperm ducts to two male genital openings on the bottomof segment On segments 9 and 10 there are two minuscule sacs calledsperm receptacles, or pores, where, during earthworm sex, sperm aredeposited.

However, this is not where eggs are produced. The egg-producingovaries reside in segment 13, from which eggs are released through the femalepores into egg sacs in segment Finally, theres a rubbery, arm-band-likething covering the worms body from segments 31 or 32 to 37, and this is calledthe clitellum.

Theepidermis is made up of a single layer of columnarepithelial cells which contain secretory gland cells. A terminal mouth opens into the buccal cavity segments which leads into muscular pharynx. A smallnarrow tube, oesophagus segments , continues into amuscular gizzard segments.

It helps in grinding thesoil particles and decaying leaves, etc. The stomachextends from segments. Calciferous glands,present in the stomach, neutralise the humic acid presentin humus. Intestine starts from the 15th segmentonwards and continues till the last segment. A pair ofshort and conical intestinal caecae project from theintestine on the 26th segment.

The characteristic featureof the intestine between segments is the presenceof internal median fold of dorsal wall called typhlosole. This increases the effective area of absorption in theintestine. The ingested organic richsoil passes through the digestive tract where digestiveenzymes breakdown complex food into smallerabsorbable units. These simpler molecules are absorbedthrough intestinal membranes and are utilised. Due to closed circulatory system, blood is confined to theheart and blood vessels.

Contractions keep blood circulatingin one direction. Blood glands are present on the 4th, 5th and 6thsegments. Blood cells are phagocytic innature. Respiratoryexchange occurs through moist body surface into their bloodstream Excretory System: The excretory organs occur assegmentally arranged coiled tubules callednephridia sing. They are of three types: i septal nephridia, present on both the sides ofintersegmental septa of segment 15 to the last thatopen into intestine, ii integumentary nephridia, attached to lining ofthe body wall of segment 3 to the last that open onthe body surface and iii pharyngeal nephridia, present as three pairedtufts in the 4th, 5th and 6th segments.

Nervous System: Nervous system is basicallyrepresented by ganglia arranged segment wise on theventral paired nerve cord. The nerve cord in the anteriorregion 3rd and 4th segments bifurcates, laterallyencircling the pharynx and joins the cerebral gangliadorsally to form a nerve ring.

The cerebral gangliaalongwith other nerves in the ring integrate sensory inputas well as command muscular responses of the body. Sensory System: Sensory system does not have eyes butdoes possess light and touch sensitive organs receptorcells to distinguish the light intensities and to feel thevibrations in the ground. Worms have specialisedchemoreceptors taste receptors which react to chemicalstimuli.

These sense organs are located on the anteriorpart of the worm. Reproductive System: Earthworm is hermaphrodite bisexual , i. There are two pairs of testes present in the 10thand 11th segments. Their vasa deferentia run up to the 18thsegment where they join the prostatic duct. Two pairs ofaccessory glands are present one pair each in the 17th and19th segments.

The common prostrate and spermatic duct vary differential opens to the exterior by a pair of male genitalpores on the ventro-lateral side of the 18th segment. Fourpairs of spermathecae are located in 6th-9th segments onepair in each segment. They receive and store spermatozoa during copulation.

Onepair of ovaries is attached at the inter-segmental septum of the12th and 13th segments. Ovarian funnels are present beneaththe ovaries which continue into oviduct, join together and openon the ventral side as a single median female genital pore onthe 14th segment They arealso used as bait in game fishing.

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It is composed of. Digestive system. It has. It increases area of absorption. Digested nutrients are absorbed through intestinal membranes. Their faecal deposits are known as worm castings. Circulatory system blood vascular system.


morphology of animals. OESOPHAGUS narrow tubular structure from 5th to the 7th segment 5. GIZZARD Prominent, oval, hard and thick.


The following is a classification of a species in the earthworm family Lumbricidae. This common species is Lumbricus terrestris also known as the night crawler or dew worm. In this article, we will cover earthworm anatomy and an introduction on dissecting an earthworm.

What is an Annelid?. Annelids are ringed or segmented worms. Earthworm Facts. Except for the first and last segments, all body segments have the same sets of organs.

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