Santos-Silva et al., 2013: 215

Prionus (Prionacalus) Cacicus White 1845: 110 ([Syntypes] "Mexico" BMNH)
Prionacalus Cacicus; White 1850: 10
Psalidognathus cacicus; Reiche 1850: 249
Psalidognathus (Prionocalus) cacicus; Reiche, 1850: 265
Prionocalus Cacicus; Thomson 1864: 281 [misspelling]
Prionocalus cacicus; Lacordaire 1869: 42 [misspelling]
Prionacalus cacicus; Gemminger and Harold, 1872: 2755 [catalogue]
Prionacalus casicus; Komiya 2001: 30 [misspelling]

Psalidognathus Wallisi Taschenberg 1870: 191 [femelle] ([Syntypes] Ecuador Loja MLUH) (Lameere 1910: 378 [synonymie])
Prionacalus atys (nec White, 1850); Lacordaire 1876: pl. 81

Prionocalus Gunteri Gahan 1894: 221 [misspelling] ([Holotype] Ecuador, Zoruma, El Oro BMNH) (Lameere, 1910: 376 [synonymie] ; Santos-Silva et al., 2013: 213 [synonymie])
Psalidognathus (Prionocalus) Buckleyi var. Gunteri; Lameere 1913: 65 [revalidation] [misspelling]
Prionacalus gunteri; Jeniš 2010: 16

NB:
- Syntypes pris certainement en Équateur (Loja) d'après Thomson, 1877: 260.
- "At least two places in Colombia named "Mexico" located in two different departments: Huila and Arauca" (Santos-Silva et al., 2013: 216).