Abstract
Nematodes collected from the stomach and large intestine of Rhinoclemmys punctularia (Daudin) from the eastern Amazon, Brazil, are assigned to a new genus, Vogtnema n. gen., allocated in the family Atractidae (Cosmocerdoidea). Vogtnema n. gen. differs from all other genera of Atractidae based on the combination of the following morphological characters: four lips V-shaped (two subdorsal and two subventral) without sclerotized structures associated, absence of sclerotized formations and/or pieces surrounding the oral opening, oral aperture surrounded by flange internal membranous structures; in males the larger spicule is alate. The type species Vogtnema asymmetrica n. gen., n. sp. has the five precloacal pairs of papillae situated on the right side of the body that are more prominent than those on the left side. We also provide an identification key to the genera of the family Atractidae.
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