Poultry nematode (Heterakis gallinarum), SEM

Poultry nematode (Heterakis gallinarum), SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph (SEM) of Poultry roundworm (Heterakis gallinarum). The stomodeum is the mouth and lip region (buccal cavity) of nematodes. It consists of three lips each equipped with small piercing projections or papillae. This nematode infects domestic chickens and related birds. Infection occurs when eggs are usually eaten from soil. The second stage juveniles hatch in the gizzard or duodenum and pass down to the ceca. Most complete their development in the lumen, but some penetrate the mucosa, where they remain for 2 to 5 days without further development. Returning to the lumen they mature into adults. Adult roundworms lay eggs inside the infected bird. The eggs develop in to the infective stage and are voided from the host through the faeces. They can remain infective for up to 4 years in the soil. Magnification x400 when shortest axis printed at 25 millimetres.

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Keywords: 23064c, animal, ascarid, ascaridida, ascarididae, bird, black and white, buccal, cavity, condition, disease, disorder, electron, endoparasite, faecal, false-colored, fauna, fecal, gallinarum, helminth, heterakis, host, infection, infections, micrograph, monochrome, nematoda, nematode, no-one, nobody, parasite, parasitic, paratenic, poultry, rhabditia, roundworm, roundworms, scanning, scanning electron micrograph, secernentea, sem, stomodeum, worm

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