ɡˈɪɡəəkˌænəm dˈɛlkoːɹɾi wʌz lˈaɪkli ɛkstˈɪŋkt ɔːɹ ɛkstɹˈiːmli ɹˈɛɹ baɪ ðə tˈaɪm ʌvðə kˌɑːlənəzˈeɪʃən ʌv nˈuː kˌælɪdˈoʊniə ɪnðə mˈɪd nˈaɪntiːnθ sˈɛntʃɚɹi, dˈuː tə ðɪ ˈæbsəns ʌv ˌɛni ˈʌðɚ ɹˈɛkɚdz ʌvðə spˈiːsiːz.
Gigarcanum delcourti was likely extinct or extremely rare by the time of the colonisation of New Caledonia in the mid 19th century, due to the absence of any other records of the species.