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 (RÃœPPEL, 1845) (Abessinisches Chamäleon)
• Trioceros balebicornatus (TILBURY, 1998)
• Trioceros bitaeniatus (FISCHER, 1884) (Zweistreifenchamäleon)
• Trioceros camerunensis (MÃœLLER, 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 (GÃœNTHER, 1895)
• Trioceros feae (BOULENGER, 1906)
• Trioceros fuelleborni (TORNIER, 1900) (Poroto-Dreihornchamäleon)
• Trioceros goetzei:
  • Trioceros goetzei goetzei (TORNIER, 1899)
  • Trioceros goetzei nyikaei (LOVERIDGE, 1953)
• Trioceros hanangensis n. sp. KRAUSE & BÖHME, 2010
• Trioceros harennae:
  • Trioceros harennae harennae (LARGEN, 1995)
  • Trioceros harennae fitchi (NECAS, 2004)
• 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 quadricornis quadricornis (TORNIER, 1899)
  • Trioceros quadricornis gracilior (BÖHME & KLAVER, 1981)
• 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:
  • Trioceros wiedersheimi wiedersheimi (NIEDEN, 1910)
  • Trioceros wiedersheimi perreti (KLAVER & BÖHME, 1992)

• Diskussion