Family characterized by large metacorpus (median bulb), esophageal glands
usually not enclosed in a bulb (overlapping). Dorsal esophageal gland
opens into metacorpus. Males have caudal papillae. Often, but not
exclusively, associated with ferns, gymnosperms, and monocotyledons; also
Maggenti suggests that the Aphelenchina are an earlier evolutionary group
than the Tylenchina.
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