Trioceros (von "dreigehörnt"), deren Vertreter oft landläufig als "Dreihornchamäleons" bezeichnet werden, bilden seit 2009 eine eigene Gattung. (COLIN R. TILBURY & KRYSTAL A. TOLLEY (2009) - A re-appraisal of the systematics of the African genus Chamaeleo, Zootaxa 2079: 57–68 (2009) )
Gattung: Trioceros SWAINSON, 1839
- Trioceros affinis (RÜPPEL, 1845) (Abessinisches Chamäleon)
- Trioceros balebicornatus (TILBURY, 1998)
- Trioceros bitaeniatus (FISCHER, 1884) (Zweistreifenchamäleon)
- Trioceros camerunensis (MĂśLLER, 1909)
- Trioceros chapini (DE WITTE, 1964)
- Trioceros conirostratus (TILBURY, 1998)
- Trioceros cristatus (STUTCHBURY, 1837) (Kammchamäleon)
- Trioceros deremensis (MATSCHIE, 1892) (Usambara-Dreihornchamäleon)
- Trioceros eisentrauti (MERTENS, 1968)
- Trioceros ellioti (GĂśNTHER, 1895)
- Trioceros feae (BOULENGER, 1906)
- Trioceros fuelleborni (TORNIER, 1900) (Poroto-Dreihornchamäleon)
- Trioceros goetzei:
- Trioceros hanangensis n. sp. KRAUSE & BĂ–HME, 2010
- Trioceros harennae:
- Trioceros hoehnelii: (Helmchamäleon)
- Trioceros hoehnelii hoehnelii (STEINDACHNER, 1891)
- Trioceros hoehnelii altaeelgonis (LOVERIDGE, 1935)
- Trioceros incornutus (LOVERIDGE, 1932)
- Trioceros ituriensis (SCHMIDT, 1919)
- Trioceros jacksonii: (Jackson's Chamäleon)
- Trioceros jacksonii jacksonii (BOULENGER, 1896)
- Trioceros jacksonii merumontanus (RAND, 1958)
- Trioceros jacksonii xantholophus (EASON, FERGUSON & HEBRARD, 1988)
- Trioceros johnstoni (BOULENGER, 1901) (Johnston's Chamäleon)
- Trioceros kinetensis (SCHMIDT, 1943)
- 'Trioceros laterispinis (LOVERIDGE, 1932)
- Trioceros marsabitensis (TILBURY, 1991)
- Trioceros melleri (GRAY, 1865)) (Meller's Chamäleon, Elefantenohrchamäleon)
- Trioceros montium (BUCHHOLZ, 1874) (Bergchamäleon)
- Trioceros narraioca (NECAS, MODRY & SLAPETA 2003) (Mt. Kulal-Chamäleon)
- Trioceros ntunte (NECAS, MODRY & SLAPETA 2005)
- Trioceros oweni (GRAY, 1831) (Owen's Dreihornchamäleon)
- Trioceros pfefferi (TORNIER, 1900) (Pfeffer's Chamäleon)
- Trioceros quadricornis: (Vierhornchamäleon)
- Trioceros rudis (BOULENGER, 1906)
- Trioceros schoutedeni (LAURENT, 1952)
- Trioceros schubotzi (STERNFELD, 1912)
- Trioceros sternfeldi (RAND, 1963)
- Trioceros tempeli (TORNIER, 1899)
- Trioceros tremperi (NECAS, 1994)
- Trioceros werneri (TORNIER, 1899) (Werner's Dreihornchamäleon)
- Trioceros wiedersheimi:


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