The only difference is the morphology of filariform larva.

The life cycle of the two species of hook worm are same.It is the non-feeding form of the worm and is the infective form of the parasite.The female Ancylostoma produces 10,000-20,000 eggs per day whereas N.The eggs of Necator is slightly smaller than Ancylostoma.These eggs floats in saturated solution of common salt.A clear space is present between the egg shell and segmented ovum.Eggs contain an un-segmented ovum usually with 4 blastomeres.They are surrounded by a transparent hyaline shell-membrane.60 mm in length and 40 mm in breadth colorless.-Dorsal lobe consists 3 (1 single dorsal ray and 2 external dorsal rays: the two lateral lobes contain 1/3 pairs of lateral rays and 2 pairs of ventral rays).вЂ“ It is membranous, asymmetrical and consists of 13 fingers like rays in 3 lobes: 1 dorsal and 2 lateral.Copulatory bursa in males is characteristic bell shaped used to catch and hold the female nematode during mating.Owing to the position of the genital opening, the worm assumes the Y-shaped figure during copulation.The genital pore is present at the junction of posterior and middle third of the body.The posterior end is tapering and possess no bursa.longer than males, measuring 12.5 mm in length.-Genital opening is present posteriorly and opens with the cloaca.shorter, measuring 8mm in length, the posterior end is expanded in an umbrella like fashion (copulatory bursa).The sexes are easily differentiated by their size, the shape of the tail and position of the genital opening.one of them called the esophageal gland, secretes a ferment which prevents the clotting of blood.There are five glands connected with the digestive system:.The buccal capsule is provided with 6 teeth, 4-hook like on the ventral surface and had a pair of knob-like (triangular plates) on the dorsal surface.The large and conspicuous buccal capsule is lined with a hard substance.The anterior end of the worm is bent slightly in the same direction of the body curve resembling a hook, hence they are called hookworms.When freshly passed the worm has a reddish-brown color due to the ingested blood in intestinal tract.It is small greyish white, cylindrical worm.Morphology : Ancyclostoma duodenale Adult worm: The adult worm lives in the small intestine of a man particularly in the jejunum, less often in the duodenum and rarely in the ileum.Necatoriasis is the term for the condition of being host to an infestation of a species of Necator.

Necator americanus also known as the New World hookworm is another cause of hookworm disease in humans.

It causes ancylostomiasis in humans, characterized by non-deficiency anemia and hypoalbuminemia.

Ancylostoma duodenale, also known as the old hookworm is a common hookworm of human.

Two species of hookworms, commonly infect humans:.

They are characterized by their presence of well-defined buccal capsules bearing clotting plates and teeth.

Hookworms are parasitic nematode that lives in the small intestine of mammalian host such as dog, cat or humans.

Cause of hookworms in humans