Microfilaria: with cephalic hook and button-hook tail.
01a. Microfilaria: <5.6Ám wide, anterior NOT tapering, cephalic hook present, some with tails in the shape of a button-hook.
Microfilaria: without cephalic hook and with straight tail.
01b. Microfilaria: 6.0 to 7.0Ám wide, anterior tapers, NO cephalic hook present, tails NOT shaped like a button-hook.
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