The Reptile Anatomy ClipArt gallery provides 61 illustrations of reptile body parts, skeletons, organs, and other internal and external anatomical views.

"Skull of lizard with Acrodont Dentition. One of those lizards which have the edge of the jaw, without bony aveoli on either the inner or the outer side."-Whitney, 1902

Acrodont

"Skull of lizard with Acrodont Dentition. One of those lizards which have the edge of the jaw, without…

"When the animal wishes to use these teeth, they issue from this fleshy sheath, somewhat in the same manner as the claws of a cat when about to be used as weapons of offense."

Fangs and Tongue of an Adder

"When the animal wishes to use these teeth, they issue from this fleshy sheath, somewhat in the same…

In reptiles the alimentary canal differs much from that of mammals or birds. As a general rule, it is shorter in proportion to the trunk than in warm-blooded vertebrates. Labels: 1, esophagus; 2, stomach; 3, small intestine; 4,large intestine.

The Alimentary Canal of the Flying Lizard

In reptiles the alimentary canal differs much from that of mammals or birds. As a general rule, it is…

Alligator claws.

Alligator

Alligator claws.

"Brain of alligator, from above. B. ol., olfactory bulb; G. p, epiphysis; HH, cerebellum; Med, spinal cord; MX, optic lobes; NH, medulla oblongata; VH, cerebral hemispheres; I-XI, cranial nerves; 1, 2, first and second spinal nerves." -Parker, 1900

Alligator Brain

"Brain of alligator, from above. B. ol., olfactory bulb; G. p, epiphysis; HH, cerebellum; Med, spinal…

"Skull of a member of the family Alligatoridæ, or some American member of the Crocodilidæ."-Whitney, 1902

Alligator Skull

"Skull of a member of the family Alligatoridæ, or some American member of the Crocodilidæ."-Whitney,…

"In popular language, the name of all those large serpents which kill their prey by entwining themselves around it, and constricting it in their coils; but by zoologists of the present day, limited as the name of a genus to a very small portion of their number, all of which are natives of the warm parts of America." — Chambers, 1881

Boa

"In popular language, the name of all those large serpents which kill their prey by entwining themselves…

"Skull of Boa constrictor. a, quadrate bone; b, b, halves of lower jaw." -Cooper, 1887

Boa Constrictor Skull

"Skull of Boa constrictor. a, quadrate bone; b, b, halves of lower jaw." -Cooper, 1887

Section of brain of turtle

Brain

Section of brain of turtle

In Amphibians the nervous system is but slightly developed. The cerebrum is small; the cerebellum is scarcely visible. Shown is the brain of an alligator. Labels: 1, Olfactory ganglions. 2, Cerebrum. 3, Optic ganglions. 4, Cerebellum. 5, Medulla Oblongata and Spinal Cord.

Brain of an Alligator

In Amphibians the nervous system is but slightly developed. The cerebrum is small; the cerebellum is…

The structure of a branchiopod.

Branchiopod

The structure of a branchiopod.

Diagram of the circulation of the reptile. Labels: a, pulmonic, and b, somatic circulation; c, heart showing the three cavities. The arrows indicate the course of the blood current.

Circulation of a Reptile

Diagram of the circulation of the reptile. Labels: a, pulmonic, and b, somatic circulation; c, heart…

In the U.S. the five-lined or blue-tailed skink is the common variety. This is a close-up of its claw.

Skink Claw

In the U.S. the five-lined or blue-tailed skink is the common variety. This is a close-up of its claw.

"Skeleton of crocodile. C, causal region; D, thoracic region of spinal column; F, fibula; Fe, femur; H, humerus; I, ischium; L, lumbar region; R, radius; Ri, ribs; S, sacrum; Sc, scapula; Sta, abdominal ribs; T, tibia; U, ulna." -Parker, 1900

Crocodile Skeleton

"Skeleton of crocodile. C, causal region; D, thoracic region of spinal column; F, fibula; Fe, femur;…

The skull of a crocodile with visible teeth.

Crocodile Skull

The skull of a crocodile with visible teeth.

"Segment of Endoskeleton from Thoracic Region of Crocodile. C, centrum of a vertebra, over which rises the neural arch, inclosing the neural canal and ending in NS, the neural spine; Z, prezygapophysis; Z', postzygapophysis; Tt, transverse process which articulates with t, tubercle of a rib; Cpt, that which articulates with Cp, capitulum of a rib; Vr, ossified vertebral rib, or pleurapophysis; Vr', cartilaginous part of same; Str, sternal rib, or hemapophysis; St, segment of sternum; Pu, uncinate process of a rib or epipleura. From Cpt to St, on either side, is the hemal arch." -Whitney, 1911

Crocodile Thoracic Region

"Segment of Endoskeleton from Thoracic Region of Crocodile. C, centrum of a vertebra, over which rises…

"Cervical vertebra of crocodile. N.S., Neural spine; P.A., posterior articular process; A.A., anterior articular process; C.R., cervical rib; C., procoelous centrum." -Thomson, 1916

Crocodile Vertebra

"Cervical vertebra of crocodile. N.S., Neural spine; P.A., posterior articular process; A.A., anterior…

Longitudinal section through the pineal eye of a lizard. The eye is located in the middle of the dorsal side of the head and is covered by the translucent scaled. The outer wall of the eye vesicle is thickened to form a lens, while the inner pigmented wall is the retina from which the nerve proceeds.

Eye of a Lizard

Longitudinal section through the pineal eye of a lizard. The eye is located in the middle of the dorsal…

Skull of a Greek tortoise, showing the brain cavity.

Skull of Greek tortoise

Skull of a Greek tortoise, showing the brain cavity.

The head of a snake.

Coluber Head

The head of a snake.

Heart and blood vessels of the turtle. Ad, right auricle; As, left auricle; Ao.d, right arch of the aorta; Ao.s, left arch of the aorta; Ap, dorsal aorta; C, carotids; Ap, pulmonary arteries.

Heart and Blood Vessels of a Turtle

Heart and blood vessels of the turtle. Ad, right auricle; As, left auricle; Ao.d, right arch of the…

A diagram of the heart of a reptile. Labels: 1, Pericardium. 2, Single ventricle. 3, Left auricle. 4, Right auricle. The arrows show the direction of the blood flow.

A Diagram of the Heart of a Reptile

A diagram of the heart of a reptile. Labels: 1, Pericardium. 2, Single ventricle. 3, Left auricle. 4,…

Hylonomus was an early reptile. It lived 315 Ma (million years ago) during the Carboniferous period. Pictured here is the dorsal vertebra

Dorsal Vertebra of the Hylonomus

Hylonomus was an early reptile. It lived 315 Ma (million years ago) during the Carboniferous period.…

The bottom jaw of an iguana.

Iguana Jaw

The bottom jaw of an iguana.

"Heart of monitor (Varanus) dissected to show the cavity of the ventricle and the vessels leading out from it. A. A', auricles; Ao, dorsal aorta; Ap. Ap', pulmonary arteries; Asc, subclavian artery; Ca. Ca', carotids; RA. RA, roots of dorsal aorta; Trca, innominate trunk; V, ventricle; +, right aortic arch; *, left aortic arch." -Parker, 1900

Monitor Lizard Heart

"Heart of monitor (Varanus) dissected to show the cavity of the ventricle and the vessels leading out…

Nerve ending in muscular fiber of a lizard (Kühne). The end-plate, or motorial ending of the axone, is seen sideways.

Nerve Ending in Muscle Fiber of Lizard

Nerve ending in muscular fiber of a lizard (Kühne). The end-plate, or motorial ending of the axone,…

"Side view of skull of Lacerta. px., Premaxilla; mx., maxilla; l., lachrymal; j., jugal; t.pa., transpalatine; epg., epipterygoid; pg., pterygoid; bpg., basipterygoid; b.o., basioccipital; q., quadrate; oc.c., occipital condyle; sq., squamosal; pr.o., pro-otic; pt.o., postorbital; st.1, st.2, supratemporals; ps., presphenoid (the optic nerve is seen issuing in front of the end of the reference line); p.e., mesethmoid; s.ob., supraorbitals; pf., prefrontal; n., nasal; ar., articular; ag., angular; sag., surangular; cr., coranary; d., dentary." -Thomson, 1916

Lizard Skull

"Side view of skull of Lacerta. px., Premaxilla; mx., maxilla; l., lachrymal; j., jugal; t.pa., transpalatine;…

"Lacerta agilis. General view of the viscera in their naturaal relations. Bl, urinary bladder; Ci, post-caval vein; ED, rectum; GB, gall-bladder; H, heart; Lg, Lg', the lungs; M, stomach; MD, small intestine; Oe, oesophagus; Pn, pancreas; Tr, trachea." -Parker, 1900

Sand Lizard Viscera

"Lacerta agilis. General view of the viscera in their naturaal relations. Bl, urinary bladder; Ci, post-caval…

From preparation of the nerve termination in the muscular fibers of a snake. A, End plate seen only broad surfaced. b, End plate seen as narrow surface.

Muscular Fiber Cells of a Snake

From preparation of the nerve termination in the muscular fibers of a snake. A, End plate seen only…

"Section through a young newt. c.t., Connective tissue; E., epidermis; D., dermis; S.C., spinal cord; M., muscle; N., notochord; Sh., mesodermic sheath of notochord; K., kidney; l., lung; S., spleen; ST., stomach; Pe., peritoneum; L., liver; d., duct of the pancreas (P); G.B., gall-bladder; V., dorsal aorta." -Thomson, 1916

Newt Anatomy

"Section through a young newt. c.t., Connective tissue; E., epidermis; D., dermis; S.C., spinal cord;…

A rattlesnake's rattle, with twenty-four joints.

Rattlensnake rattle

A rattlesnake's rattle, with twenty-four joints.

Dissection of head of rattlesnake; showing fangs (f) and poison sac (p).

Rattlesnake

Dissection of head of rattlesnake; showing fangs (f) and poison sac (p).

"The vertebre of serpents are so formed as to admit a great pliancy of the body, which is capable of being coiled up, with the head in the center of the coil, and some serpents have the power of throwing themselves to some distance from this coiled position." — Chambers, 1881

Rattlesnake Skeleton

"The vertebre of serpents are so formed as to admit a great pliancy of the body, which is capable of…

This illustration shows the skull of a rattlesnake. ar, articular portion of lower jaw; de, dentary portion; bo, basi-occipatal; mx, maxilla, bearing poison fang; na, nasal; pl, palatine, the front end being represented by a dotted line as though seen through the maxilla; pmx, premaxilla; po, post frontal; pr, prefrontal; pt, pterygoid; qu, quadrate; sq, squamosal; tr, transverse bone.

Rattlesnake Skull

This illustration shows the skull of a rattlesnake. ar, articular portion of lower jaw; de, dentary…

"Origin of amnion and allantois. 1. Rise of amniotic folds (a.f.) around embryo (e); p.p., pleuro-peritoneal cavity; y., yolk. 2. Further growth of amniotic folds (a.f.) over embryo and around yolk. 3. Fusion of amniotic folds above embryo; a.p., amnion proper; s.z.m., subzonal membrane; y.s., yolk-sac. 4. Outgrowth of allantois (al.); amniotic cavity (a.c.); h., head end; t. tail end. 5. Complete enclosure and reduction of yolk-sac (y.s.); s.z.m, subzonal membrane; a.p., amnion proper; al., allantois; g., gut of embryo." -Thomson, 1916

Reptile Development

"Origin of amnion and allantois. 1. Rise of amniotic folds (a.f.) around embryo (e); p.p., pleuro-peritoneal…

A frame surrounded by various reptiles.

Reptiles

A frame surrounded by various reptiles.

The skull of a serpent with visible teeth.

Serpent Skull

The skull of a serpent with visible teeth.

The underside of a turtle or tortoise shell.

Turtle Shell

The underside of a turtle or tortoise shell.

Skeleton of a tortoise, seen from below, the plastron having been removed. (ca) carapace.

Tortoise Skeleton

Skeleton of a tortoise, seen from below, the plastron having been removed. (ca) carapace.

The underside view of a tortoise skeleton.

Tortoise Skeleton

The underside view of a tortoise skeleton.

"Head-shields of Scinid Lizards. cs, chin-shields; d, disk on lower eylid; e, ear-opening; f, frontal; fn, frontonasal; fp, frontoparietal; i, interparietal; il, lower labials; l, loreals; lb, upper labials; m, mental; n, nasal; nc, nuchals; p, parietals; pf, prefrontal; pn, postnasal; r, rostral; sc, supraciliaries; sn, supranasal; so, supraocular; t, temporal." -Whitney, 1911

Skink Head

"Head-shields of Scinid Lizards. cs, chin-shields; d, disk on lower eylid; e, ear-opening; f, frontal;…

Structure of internal anatomy of a snake.

Snake

Structure of internal anatomy of a snake.

"Snake's head. dv., Poison fangs; b., sheath of fang; l., tongue; rl., muscles of tongue." -Thomson, 1916

Snake Head

"Snake's head. dv., Poison fangs; b., sheath of fang; l., tongue; rl., muscles of tongue." -Thomson,…

"Poison apparatus of rattlesnake. A, eye; Gc, poison-duct entering the poison-fang at +; Km, muscles of mastication partly cut through at *; Mc, masseter or constrictor muscle; Mc', continuation of the constrictor muscle to the lower jaw; N, nasal opening; S, fibrous poison-sac; z, tongue; za, opening of the poison-duct; zf, pouch of mucous membrane enclosing the poison-fangs." -Parker, 1900

Rattlesnake Poison Apparatus

"Poison apparatus of rattlesnake. A, eye; Gc, poison-duct entering the poison-fang at +; Km, muscles…

The rattling tail of the rattle snake.

Rattlesnake Tail

The rattling tail of the rattle snake.

"Heart and associated vessels of tortoise. r.a., Right auricle; superior venae cavae (s.v.c.) and inferior vena cava (i.v.c.) enter it. r.v., Right half of ventricle; pulmonary arteries (p.a.) and left aortic arch (l.ao.) leave it; coel., coeliac; d.ao., dorsal aorta. l.a., Left auricle; p.v., pulmonary veins enter it. l.v., Left half of ventricle; right aortic arch (r.ao.), giving off carotids (c.) and subclavians (s.cl.)." -Thomson, 1916

Tortoise Heart

"Heart and associated vessels of tortoise. r.a., Right auricle; superior venae cavae (s.v.c.) and inferior…

"Internal view of the plastron of the Greek tortoise. EP., Epiplastron (clavicle?); ENT., entoplastron (interclavicle?); HYO., hyoplastron; HYPO., hypoplastron; XIPHI., xiphiplastron." -Thomson, 1916

Greek Tortoise Plastron

"Internal view of the plastron of the Greek tortoise. EP., Epiplastron (clavicle?); ENT., entoplastron…

"Scales on ventral surface of plastron of Greek tortoise. G., Gular; H., humeral; P., pectoral; Ab., abdominal; F., femoral; A., anal; M., marginal." -Thomson, 1916

Greek Tortoise Plastron

"Scales on ventral surface of plastron of Greek tortoise. G., Gular; H., humeral; P., pectoral; Ab.,…

A skeleton of a tortoise The ribs of which are expanded, forming the dorsal part of its shell. Labels: 1, cervical; 2, dorsal; 3, lumbar vertebra; 4, scapula; 5, clavicle; 6, coracoid bone; 13, humerus; 14, ulna; 15, radius, 16, carpus. 17, phalanges (fingers); 7, femur; 8, tibia; 9, fibula; 10, tarsus. 11, metatarsus, 12, phalanges (toes).

Skeleton of a Tortoise

A skeleton of a tortoise The ribs of which are expanded, forming the dorsal part of its shell. Labels:…

"Internal view of tortoise skeleton. H., humerus; SC., scapula running dorsally; PC., precoracoid; C., coracoid; EC., epicoracoid cartilage; P., pubis; IL., ilium running dorsally to sacral vertebrae; IS., ischium; DV., dorsal vertebrae fused in carapace; R., head of a rib; CEV., cervical vertebrae free; CAV., caudal vertebrae free." -Thomson, 1916

Tortoise Skeleton

"Internal view of tortoise skeleton. H., humerus; SC., scapula running dorsally; PC., precoracoid; C.,…

"Dissection of Chelonian heart. r.v., Right half of ventricle; S., septum; l.v., left half of ventricle; r.a., right auricle; l.a., left auricle; l.ao., left aortic arch; r.ao., right aortic arch; p.a., pulmonary arch." -Thomson, 1916

Turtle Heart

"Dissection of Chelonian heart. r.v., Right half of ventricle; S., septum; l.v., left half of ventricle;…

"Hyoid apparatus of a Chelonian. BH., Body of the hyoid (basihyal); H., representing another part of the hyoid arch; A.C., anterior cornu, representing the first branchial arch; P.C., posterior cornu, representing the second branchial arch." -Thomson, 1916

Turtle Hyoid

"Hyoid apparatus of a Chelonian. BH., Body of the hyoid (basihyal); H., representing another part of…

"Pectoral girdle of a Chelonian. G., Glenoid cavity; SC., scapula; P.C., procoracoid fused to the scapula; C., coracoid; E.C., epicoracoid cartilage; L., ligament." -Thomson, 1916

Turtle Pectoral Girdle

"Pectoral girdle of a Chelonian. G., Glenoid cavity; SC., scapula; P.C., procoracoid fused to the scapula;…

"Chelone midas. Transverse section of skeleton. C, costal plate; C', centrum; M, marginal plate; P, lateral element of plastron; R, rib; V, expanded neural plate." -Parker, 1900

Green Turtle Skeleton

"Chelone midas. Transverse section of skeleton. C, costal plate; C', centrum; M, marginal plate; P,…

"Cistudo lutaria. Skeleton seen from below; the plastron has been removed and is represented on one side. C, costal plate; Co, coracoid; e, entoplastron; Ep, epiplastron; F, fibula; Fe, femur; H, humerus; Il, ilium; Is, ischium; M, marginal plates; Nu, nuchal plate; Pb, pubis; Pro, pro-coracoid; Py, pygal plates; R, radius; Sc, scapula; T, tibia; U, ulna." -Parker, 1900

Marsh Turtle Skeleton

"Cistudo lutaria. Skeleton seen from below; the plastron has been removed and is represented on one…

"Skull of turtle. "S.O., supra-occipital; PAR., parietal; FR., frontal; P.F., pre-frontal; PO.F., post-frontal; SQ., squamosal; PMX., pre-maxilla; MX., maxilla; J., jugal; Q.J., quadrato-jugal; Q., quadrate; D., dentary; AN., angular; AR., articular; S., surangular." -Thomson, 1916

Turtle Skull

"Skull of turtle. "S.O., supra-occipital; PAR., parietal; FR., frontal; P.F., pre-frontal; PO.F., post-frontal;…

"Turtle is, in zoology, the popular name for any species of the Cheloniidæ. They may be distinguished by their long, compressed, fin-shaped, non-retractile feet, with the toes inclosed in a common skin, from which only one or two claws project. The carapace is broad and much depressed, so that when these animals are on shore, and are turned over on their backs, they cannot regain the natural position. Turtles are marine animals; their pinnate feet and light shell render them excellent swimmers. They sometimes live at a great distance from land, to which they periodically return to deposit their soft-shelled eggs in the sand."—(Charles Leonard-Stuart, 1911)

Skeleton of Turtle

"Turtle is, in zoology, the popular name for any species of the Cheloniidæ. They may be distinguished…

"The Tortoise will continue to live on for six months after it is deprived of its brain."

Skeleton of a Turtle

"The Tortoise will continue to live on for six months after it is deprived of its brain."

Skeleton of a turtle.

Skeleton of a turtle

Skeleton of a turtle.

Section of the head of a serpent. a, poison fangs; b, poison glands; c, conductor for the poison; d, muscles of the jaws; e, tendon of the muscles; s, salivary glands.

Cross section of a viper head

Section of the head of a serpent. a, poison fangs; b, poison glands; c, conductor for the poison; d,…