Nematode eggs

Common nematode eggs and larvae easily recognized on microscopy (wet mount) include:
(A) Ascaris
(B) Trichuris (wet mount with iodine)
(C) hookworm (wet mount with iodine)
(D) Enterobius (pinworm)
(E) Capillaria
(F) Strongyloides rhabditiform larvae
Ascaris eggs are large with rough surfaces and a dark dense center (A). Trichuris eggs have distinctive mucus plugs at either end as well as a "tea tray" appearance (B). Hookworm eggs are optically clear at the edges with a dense center composed of one or more cells (C). Enterobius eggs have a distinctive oval shape with slight concavity (D). Capillaria eggs are similar to Trichuris but are smaller with more flattened ends (E). Strongyloides larva may be distinguished from hookworm larva by the presence of a short buccal cavity and primordial genitalia midway down the body (F).
The measurements given represent the range seen for the black bar lengths for each organism.