6. Amblyomma arcanum Karsch, 1879b .

An Afrotropical species whose adults are usually found on Squamata: Varanidae, and nymphs have also been collected from this type of host; adults alone have been recovered from Crocodilia: Crocodylidae, Rodentia: Anomaluridae, Chiroptera: Pteropodidae, and Pholidota: Manidae . There are no records of Amblyomma arcanum causing human parasitism.

M: Karsch (1879b)

F: Tendeiro (1955), under the name Aponomma arcanum

N: undescribed

L: unknown

Redescriptions

M: Schulze (1935d), Tendeiro (1955) and Santos-Dias (1993), all under the name Aponomma arcanum

F: Santos-Dias (1993), under the name Aponomma arcanum

Note: Theiler (1945a), Kaufman (1972) and Kolonin (2009), all under the name Aponomma arcanum, consider this tick a synonym of Amblyomma exornatum; nevertheless, Guglielmone et al. (2014, 2015, 2017) treat Amblyomma arcanum as provisionally valid, pending type comparison with Amblyomma exornatum . Santos Dias (1993), using the genus name Aponomma, and others, defends the validity of Amblyomma arcanum but stresses the difficulties involved in differentiating it from Amblyomma exornatum and Amblyomma flavomaculatum .