This gallery offers 150 ClipArt images of worms. Worms are a general term given to many invertebrate animals that have a long, soft body and no legs.

Leeches are characterized by the fact that they have no lateral appendages, but are furnished with a sucker or disc at one end or at both extremeties.

Leech

Leeches are characterized by the fact that they have no lateral appendages, but are furnished with a…

Leeches are characterized by the fact that they have no lateral appendages, but are furnished with a sucker or disc at one end or at both extremeties. This is the anterior extremity showing the sucker.

Leech

Leeches are characterized by the fact that they have no lateral appendages, but are furnished with a…

"The animals belonging to this order, of which the <em>Common Leech</em> is a familiar example, are characterized by the total deficiency of any lateral appendages, their motions being effected by undulations of the body while swimming, or by the alternate attachment of the sucking discs with which the two extremities of their bodies are usually furnished." &mdash; Goodrich, 1859

Leech

"The animals belonging to this order, of which the Common Leech is a familiar example, are…

A class of suctorial worms found in bodies of water, marshes, and other moist places. There are many species, most of which inhabit fresh-water ponds, but they are also found in marine waters.

Leech

A class of suctorial worms found in bodies of water, marshes, and other moist places. There are many…

"Alimentary system of leech. m., Mouth; cr6., sixth crop-pocket; cr11., last crop-pocket; v., rectum; s., posterior sucker." -Thomson, 1916

Leech

"Alimentary system of leech. m., Mouth; cr6., sixth crop-pocket; cr11., last crop-pocket; v., rectum;…

"Dissection of leech. c.g., Cerebral ganglia; p., penis; s.v. is opposite the semminal vesicle; ov., ovary; ut., uterus; v.d., vas deferens; l.b.v., lateral blood vessel; T.4, fourth testis; n.v., nephridial vesicle; N.17, last nephridium; G.19, nineteenth pair of ganglia; n.c., nerve-cord." -Thomson, 1916

Leech Dissection

"Dissection of leech. c.g., Cerebral ganglia; p., penis; s.v. is opposite the semminal vesicle; ov.,…

"Transverse section of leech. c., Cuticle; e., epidermis; c.m., dermis and outer muscles (circular and oblique); l.m., longitudinal muscles (the peculiar connective tissue is hardly indicated); r.m., radial muscles; l.v., lateral blood vessel; d.s., dorsal sinus; v.s., ventral sinus enclosing nerve-cord (n.); g., median part of crop, with lateral pockets (p.); t., testis; f., nephridial funnels; v.d., vas deferens." -Thomson, 1916

Leech Section

"Transverse section of leech. c., Cuticle; e., epidermis; c.m., dermis and outer muscles (circular and…

"Head of Hirudo medicinalis, showing the three jaws (k); b, one of the jaws isolated, with the finely toothed free edge." -Parker, 1900

Medical Leech

"Head of Hirudo medicinalis, showing the three jaws (k); b, one of the jaws isolated, with the finely…

"Diagram of life cycle of liver fluke." -Thomson, 1916

Liver Fluke Life Cycle

"Diagram of life cycle of liver fluke." -Thomson, 1916

"Life history of liver fluke. 1. Developing embryo in egg-case; 2. free-swimming ciliated embryo; 3. sporocyst; 3a. shell of Limnaus truncatulus; 4. division of sporocyst; 5. sporocyst with rediae forming within it; 6. redia with more rediae forming within it; 7. tailed cercaria; 8. young fluke." -Thomson, 1916

Liver Fluke Stages

"Life history of liver fluke. 1. Developing embryo in egg-case; 2. free-swimming ciliated embryo; 3.…

Liver-flukes live parasitically within other animals, primarily birds and fishes. They are all more or less flattened and rounded in shape and they adhere by suctorial discs.

Liver-fluke

Liver-flukes live parasitically within other animals, primarily birds and fishes. They are all more…

"Dissection of lob-worm from dorsal surface. m., Opening of retracted buccal cavity; i., gullet; gl., diverticula on first diaphragm; gl''., oesophageal glands; d., dorsal blood vessels; ef1., first efferent branchial; g., stomach intestine; n6., sixth nephridium; ef 13., thirteenth efferent branchial; af13., thirteenth afferent branchial; a., anus; af1., first afferent branchial; h., heart of left side." -Thomson, 1916

Lob Worm

"Dissection of lob-worm from dorsal surface. m., Opening of retracted buccal cavity; i., gullet; gl.,…

"Errantia means <em>wandering</em>, and is applied to numerous species, of which the Lob-worm or Lug-worm, <em>Arenicola piscatorum</em>, is a common example. This animal, much used by fishermen for bait, is nearly a foot long, and is found on sandy parts of the coast, where it bores into the sand left wet by the retiring tide; its head is large and rounded, quite destitute of eyes or tentacula, and furnished with a short, unarmed proboscis. The feet are very small, and confined to the anterior part of the body, while the branchial tufts, which are of considerable size, are placed on each side of the middle segments." &mdash; Goodrich, 1859

Lob-worm

"Errantia means wandering, and is applied to numerous species, of which the Lob-worm or Lug-worm,…

An illustration of the marine worm larva, Lopadorhymchus.

Lopadorhymchus

An illustration of the marine worm larva, Lopadorhymchus.

"Arenicola marina. Entire animal viewed slightly from left side. Note anterior mouth; setae on anterior region; setae and gills on median region; thinner tail region often longer than shown." -Thomson, 1916

Lugworm

"Arenicola marina. Entire animal viewed slightly from left side. Note anterior mouth; setae on anterior…

"Lumbricus agricola. A, entire specimen, lateral view; B, ventral view of anterior portion of the body, magnified. 1, 15, 33, first, fifteenth, and thirty-third segments. The black dots represent the setae." -Parker, 1900

Lumbricus Agricola

"Lumbricus agricola. A, entire specimen, lateral view; B, ventral view of anterior portion of the body,…

This is a diagram illustrating lungs or tracheae. b.c., the cavity in which the body fluids circulate; l, the walls of the lung, which are much thinned inpockedings of the body wall (w); ex., the external medium-usually the atmosphere-in which the oxygen is found.

Lungs

This is a diagram illustrating lungs or tracheae. b.c., the cavity in which the body fluids circulate;…

"Distinguished by their habit of forming a tube or case, within which the soft parts of the animal can be retracted. This tube is usually attached to stones or other submarine bodies. It is often composed of carious foreign materials, such as sand, small stones, and the debris of shells, lined internally with a smooth covering of hardened mucus." &mdash; Goodrich, 1859

Terebella medusa

"Distinguished by their habit of forming a tube or case, within which the soft parts of the animal can…

"Modes of forming mesoderm. A and B, special mesoblasts distinguishable early in egmentation (annelid): A, surface view from active pole; B, sectional view of same. ec, micromeres destined to form ectoderm; en, macromeres destined to form entoderm; m, primitive mesoblast which produces the mesoderm. C, amaeboid mesodermal cells (c) budding from entoderm into the segmentation cavity (s.c.), in an Echinoderm. a, archenteron." &mdash; Galloway

Mesoderm

"Modes of forming mesoderm. A and B, special mesoblasts distinguishable early in egmentation (annelid):…

"Diagrammatic sagittal section of Microstomum, showing a chain of four zooids produced by fission. b, brain of the original zooid (the exponents indicating corresponding structures of the more recently formed zooids); c, ciliated pit; d, dissepiments indicating different stages in the separation of the zooids; e, eye-spot; ent, entoderm; g, gut; gl., glandular cells about the mouth; m., mouth of the original worm." -Galloway, 1915

Microstomum

"Diagrammatic sagittal section of Microstomum, showing a chain of four zooids produced by fission. b,…

"Parapodium of "Heteronereis" of Nereis pelagica. 1, 2, 3, 4, the leaf-like outgrowths; c1., notopodial cirrus; c2., neuropodial cirrus; a1., a2., acicula or supporting bristles of notopodium and neuropodium; s., setae." -Thomson, 1916

N. Pelagica

"Parapodium of "Heteronereis" of Nereis pelagica. 1, 2, 3, 4, the leaf-like outgrowths; c1., notopodial…

"In their form they resemble the common earth-worm; but their bodies are furnished, besides the ventral bundles of bristles, with a series of long spines on each side. They generally have two distinct eyes, and the mouth is sometimes armed with a long proboscis." &mdash; Goodrich, 1859

Nais

"In their form they resemble the common earth-worm; but their bodies are furnished, besides the ventral…

"Diagram of the structure of a male Nematode. M., mouth; OE., oesophogus; GA., nerve ring; B., bulb at lower end of fore-gut; G., mesenteron; SP., spine with sheath; A., anus; D., ejaculatory duct; VS., seminal vesicle; T., testis; ET., longitudinal excretory tube, cut short; EP., excretory pore." -Thomson, 1916

Nematode

"Diagram of the structure of a male Nematode. M., mouth; OE., oesophogus; GA., nerve ring; B., bulb…

"Diagrammatic longitudinal section of a Nemertean (Amphiporum lactifloreus), dorsal view. p.p., Proboscis pore; b., brain giving off the lateral nerve-cords (n.); po., oesophageal pocket; p., proboscis lying within its sheath; st., stilet of proboscis; m., retractor muscles of proboscis; g., gut shown in outline at the sides of proboscis; e., the three main, longitudinal blood vessels, which unite both anteriorly and posteriorly." -Thomson, 1916

Nemertea

"Diagrammatic longitudinal section of a Nemertean (Amphiporum lactifloreus), dorsal view. p.p., Proboscis…

Diagram of the organs of a Nemertine. <em>m</em>, mouth; <em>div</em>, intestinal diverticula; <em>a</em>, anus; <em>ov</em>, ovaries; <em>n</em>, nephridia; <em>br</em>, brain-lobes; <em>ln</em>, longitudinal nerve stems.

Nemertine

Diagram of the organs of a Nemertine. m, mouth; div, intestinal diverticula; a,…

Diagram of the organs of a Nemertine. <em>pr</em>, proboscis; <em>ps</em>, proboscidian sheath; <em>po</em>, opening for proboscis.

Nemertine

Diagram of the organs of a Nemertine. pr, proboscis; ps, proboscidian sheath; po,…

This illustration shows a representation of the circulation of the blood, in its essential features. The arrows indicate the course of the blood. a, arteries; aur., auricle or receiving portion of the heart; d, digestive tract; c. d., capillaries of the digestive tract; c.r., capillaries of the respiratory organs; c.s., capillaries of the system; va., valves; ve, veins; vt, ventricle.

Nephridium

This illustration shows a representation of the circulation of the blood, in its essential features.…

"The family <em>Nereidae</em> includes some elongated and distinctly annulated worms, which possess a well-developed head, furnished with tentacles and eyes, and a mouth with a proboscis, which is sometimes furnished with two or four teeth." &mdash; Goodrich, 1859

Nereis

"The family Nereidae includes some elongated and distinctly annulated worms, which possess…

A diagram of of the nephridium of Nereis. Nereis is a genus of polychaete worms in the family Nereidae. It comprises many species, most of which are marine, including the sandworm (Nereis virens) and the common clam worm (Nereis succinea). Nereis possess setae and parapodia for locomotion. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor chaetae are for crawling, and are the bristles that are visible on the exterior of the polchaeta.

Nereis

A diagram of of the nephridium of Nereis. Nereis is a genus of polychaete worms in the family Nereidae.…

Nervous system of a flatworm. Labels: G, cerebral ganglia and eyes; St, the two lateral nerve trunks; D, intestine with mouth.

Nervous System of the Flatworm

Nervous system of a flatworm. Labels: G, cerebral ganglia and eyes; St, the two lateral nerve trunks;…

This illustration shows the arrangement of the nervous material in the anterior end of an Oligochete Worm, seen in profile. That part of the body wall nearest the observer is supposed to be removed. a, anterior; b.w., body wall; g, dorsal ganglia (brain); g', ventral chain of ganglia; n, nerve ring around the pharynx; o, mouth; p, pharynx.

Oligochete Worm

This illustration shows the arrangement of the nervous material in the anterior end of an Oligochete…

Peripatus capensis, a velvet worm.

Peripatus Capensis

Peripatus capensis, a velvet worm.

"Phoronis...TR., Trunk; TE., tentacles; TU., tube." -Thomson, 1916

Phoronis

"Phoronis...TR., Trunk; TE., tentacles; TU., tube." -Thomson, 1916

"A., a minute portion of the branched excretory system of a Plathelminth, showing longitudinal duct (I), with cilia (C.), its branches (II and III), and the terminal flame-cells (IV)." -Thomson, 1916

Plathelminth

"A., a minute portion of the branched excretory system of a Plathelminth, showing longitudinal duct…

"B., one of the characteristic hollow flame-cells, leading into the excretory tubule (1), showing the long cili (2), the excretory globules (3), the nucleus (4), and pseudopodia-like processes (5) passing among adjacent cells." -Thomson, 1916

Plathelminth

"B., one of the characteristic hollow flame-cells, leading into the excretory tubule (1), showing the…

"Free-living Polychaete (Nereis cultrifera)." -Thomson, 1916

Polychaete

"Free-living Polychaete (Nereis cultrifera)." -Thomson, 1916

"Development of Polygordius. a., Mother sperm cell; b., c., sperm morulae; d., spermatosoa. 1. Ovum with large nucleus; 2. two-cell stage; 3. four-cell stage; 4. blastosphere; 5. gastrula; ac., archenteron; 6. closure of gastrula mouth or blastopore; 7. formation of stomodaeum (st.), and proctodaeum (pr.), which invaginate to meet archenteron (ac.); 8. complete gut formed; 9. elongation of larva; ap. sp., posterior segments; 11. form of adult Polygordius." -Thomson, 1916

Polygordius

"Development of Polygordius. a., Mother sperm cell; b., c., sperm morulae; d., spermatosoa. 1. Ovum…

"Diagrams of stages in the metamorphosis of Polygordius, a primitive annelid. Ectoderm throughout is represented as nucleated without cell boundaries; the entoderm has the cell-boundaries shown, and the mesoderm is diagonally shaded. A, gastrula; B, same with blastopore closed; C and D represent formation of stomodaeum and proctodaeum from ectoderm; E, Trochosphere stage showing formation of segments in the posterior portion; F, adult (sagittal); G, adult (transverse). a, archenteron; bp., blostopore; br, brain; c, coelom; d, dorsal; di, dissepiments; m, mesenteron; pr., proctodaeum; s.c., segmentation cavity; st, stomodaeum; v.n., ventral nerve chain; z, zone of formation of nerve segments." -Galloway, 1915

Polygordius

"Diagrams of stages in the metamorphosis of Polygordius, a primitive annelid. Ectoderm throughout is…

"Elytrum of Polymo&euml;, a polychaetous annelid, bearing fimbriae, viewed from above." -Whitney, 1911

Polymoë

"Elytrum of Polymoë, a polychaetous annelid, bearing fimbriae, viewed from above." -Whitney, 1911

Structure of the protonephridium (excretory organ) of a flatworm. A, part of the excretory apparatus of a tapeworm; R, edge of body; c, collecting tubules. B, terminal cells with flame of cilia. C, diagram of terminal cell, excretory capillary, and canal.

Protonephridium

Structure of the protonephridium (excretory organ) of a flatworm. A, part of the excretory apparatus…

Structure of the protonephridium (excretory organ) of an annelid. Labels: Wtr, ciliated funnels; Ds, dissepiments.

Protonephridium of an Annelid

Structure of the protonephridium (excretory organ) of an annelid. Labels: Wtr, ciliated funnels; Ds,…

"Ptychodera flava (New Caledonia), from above; about life size." &mdash; The Encyclopedia Britannica, 1910

Ptychodera Flava

"Ptychodera flava (New Caledonia), from above; about life size." — The Encyclopedia Britannica,…

The rotifers or wheel-animalcules are relatively small and beautiful organisms, rarely ever longer that a third of an inch. The rotifers make up a phylum of microscopic and near-microscopic pseudocoelomate animals. At first sight they they might be mistaken for one-celled animals, but the presence of a digestive tract and of reproductive elements soon dispels such a belief.

Rotifers

The rotifers or wheel-animalcules are relatively small and beautiful organisms, rarely ever longer that…

In the Trichina, a parasitic roundworm, the bodies of several animals, particularly the rat, are host for developing eggs. If the rat is eaten by a carnivorous animal, these excessively small young are liberated during the process of digestion and rapidly assume the adult condition in the alimentary canal, giving rise to young which pursue again the same course of development.

Roundworm

In the Trichina, a parasitic roundworm, the bodies of several animals, particularly the rat, are host…

"Esophageal Ring. Anterior end of nervous system of Polyno&euml;, a polychaetous annelid, showing, a, cerebral ganglia, connected by the esophageal ring, b, with the ventral series of ganglia, c." -Whitney, 1911

Scale Worm Nervous System

"Esophageal Ring. Anterior end of nervous system of Polynoë, a polychaetous annelid, showing, a,…

"Serpula, a genus of Polychaete worms of the family Serpulidae, whose members construct coiled calcareous tbes of a whitish color, which are attached to stones or shells."&mdash;Finley, 1917

Serpula

"Serpula, a genus of Polychaete worms of the family Serpulidae, whose members construct coiled calcareous…

Echiurus gaertneri is a species of spoon worm considered annelids, though they are not segmented.

Spoon Worm

Echiurus gaertneri is a species of spoon worm considered annelids, though they are not segmented.

In this Turbellarian the digestive tract (d.t.) is a blind sac. st., boundary of stomodaeum and mesenteron; c, cilia; g, ganglion (brain); g', ganglion of a new individual which is being formed by fission; o, mouth; o', mouth of new individual in process of formation; w, excretory system.

Stenostoma

In this Turbellarian the digestive tract (d.t.) is a blind sac. st., boundary of stomodaeum and mesenteron;…

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is an egg, containing the young tape-worm.

Tape-worm

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is an egg,…

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a bladder-worm, magnified.

Tape-worm

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a bladder-worm,…

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a head of an adult tape-worm showing the hooklets and suckers.

Tape-worm

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a head…

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a single joint, magnified, to show the branched ovary (o) and the water-vascular vessels (v).

Tape-worm

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a single…

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a fragment of Taenia solium, showing the generative joints.

Tape-worm

Tape-worms live parasitically within other animals, and are often spoken of as Entozoa. This is a fragment…

"The body is composed of numerous joints or segments, each one resembling the others; these are often several hundreds in number, and the animal sinetunes attains a length of upwards of ten feet." It is furnished with hooks and suckers at the head, by means of which it anchors itself to the intestines of its victims." &mdash; Goodrich, 1859

Tape-worm

"The body is composed of numerous joints or segments, each one resembling the others; these are often…

Probably the most widely known of the flatworms are the tapeworms. These are parasites in the digestive tube of various vertebrates, including man.

Tapeworm

Probably the most widely known of the flatworms are the tapeworms. These are parasites in the digestive…

Tapeworms are parasites in the digestive tube of various vertebrates, including man. this is the much magnfied head.

Tapeworm

Tapeworms are parasites in the digestive tube of various vertebrates, including man. this is the much…

Tapeworms live in the intestines of mammals.

Tapeworm

Tapeworms live in the intestines of mammals.

"The Tapeworm is an intestinal worm, T&aelig;nia solium, in form somewhat resembling tape. Its length is from 5 to 15 yards, and its breadth from two lines at the narrowest part to four or five at the other or broader extremity. At the narrow end is the head, which is terminated anteriorly by a central rostellum, surrounded by a crown of small recurved hooks, and behind them four suctorial depressions; then follow an immense number of segments, each full of microscopic ova. The segments are capable of being detached when mature, and reproducing the parasite. There is no mouth; but nutrition appears to take place through the tissues of the animal, as alg&aelig; derive nourishment from the sea water in which they float. The digestive system consists of two tubes or lateral canals, extending from the anterior to the posterior end of the body, and a transverse canal at the summit of each joint. [Pictured] Portion of tapeworm, natural size, showing the alternating arrangement of the generative pores."&mdash;(Charles Leonard-Stuart, 1911)

Tapeworm

"The Tapeworm is an intestinal worm, Tænia solium, in form somewhat resembling tape. Its length…

"The Tapeworm is an intestinal worm, T&aelig;nia solium, in form somewhat resembling tape. Its length is from 5 to 15 yards, and its breadth from two lines at the narrowest part to four or five at the other or broader extremity. At the narrow end is the head, which is terminated anteriorly by a central rostellum, surrounded by a crown of small recurved hooks, and behind them four suctorial depressions; then follow an immense number of segments, each full of microscopic ova. The segments are capable of being detached when mature, and reproducing the parasite. There is no mouth; but nutrition appears to take place through the tissues of the animal, as alg&aelig; derive nourishment from the sea water in which they float. The digestive system consists of two tubes or lateral canals, extending from the anterior to the posterior end of the body, and a transverse canal at the summit of each joint. [Pictured] A single segment or proglottis magnified; 1, generating pore; 2, water vessels; 3, dendritic ovary."&mdash;(Charles Leonard-Stuart, 1911)

Tapeworm

"The Tapeworm is an intestinal worm, Tænia solium, in form somewhat resembling tape. Its length…

"The Tapeworm is an intestinal worm, T&aelig;nia solium, in form somewhat resembling tape. Its length is from 5 to 15 yards, and its breadth from two lines at the narrowest part to four or five at the other or broader extremity. At the narrow end is the head, which is terminated anteriorly by a central rostellum, surrounded by a crown of small recurved hooks, and behind them four suctorial depressions; then follow an immense number of segments, each full of microscopic ova. The segments are capable of being detached when mature, and reproducing the parasite. There is no mouth; but nutrition appears to take place through the tissues of the animal, as alg&aelig; derive nourishment from the sea water in which they float. The digestive system consists of two tubes or lateral canals, extending from the anterior to the posterior end of the body, and a transverse canal at the summit of each joint. [Pictured] Head of t&aelig;nia solium (enlarged)."&mdash;(Charles Leonard-Stuart, 1911)

Tapeworm

"The Tapeworm is an intestinal worm, Tænia solium, in form somewhat resembling tape. Its length…