WoRMS source details
Cable, R.M.; Martin, W.E. (1935). Parorchis avitus (Linton, 1914), a synonym of P. acanthis (Nicoll, 1906). J. Parasitol. 21: 436-437
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Parorchis avitus Linton, 1914 accepted as Parorchis acanthus (Nicoll, 1906) Nicoll, 1907 (source of synonymy)