Etimology. The specific name is dedicated to the nickname of Mr. Yasusuke NISHIYAMA, Japanese lepidopterist.
Subspecies
F. Danielsen and Colin G. Treadaway (2004) categorized subspecies P. t. cadohaana as vulnerable and subspecies P. t. ismaeli as lower risk, conservation dependent. There are four subspecies:
Pratapa tyotaroi tyotaroi H. Hayashi,[1981] (Marinduque and Luzon)
Pratapa tyotaroi ismaeli H. Hayashi, Schrőder & Treadaway, [1983] (Mindanao)
Treadaway, C. G. (1995). "Checklist of the butterflies of the Philippine Islands (Lepidoptera: Rhopalocera)". Nachrichten des Entomologischen Vereins Apollo. Suppl. 14: 7–118.
Takanami, Yusuke & Seki, Yasuo (April 1, 2001). "Edition 12". A Synonymic List of Lycaenidae from the Philippines. Archived from the original on June 14, 2001 – via Internet Archive.
Danielsen, F. & Treadaway, Colin G. (2004). "Priority conservation areas for butterflies (Lepidoptera: Rhopalocera) in the Philippine islands:. Animal Conservation, Zoological Society of London. 7: 79-92.
Treadaway, Colin G. & Schrőder, Heinz G. (2012). "Revised checklist of the butterflies of the Philippine Islands (Lepidoptera: Rhopalocera)". Nachrichten des Entomologischen Vereins Apollo. Suppl. 20: 1-64.
Hayashi, Hisakazu (2013). "New record of Deramas manobo and Pratapa tyotaroi ismaeli from Mt. Masara (SE Mindanao Is., the Philippines)". Yadoriga. 237: 30.