ɡˈɪɡəəkˌænəm dˈɛlkoːɹɾi ɪz fˈɪfti pɚsˈɛnt lˈɔŋɡɚ ænd wʌz lˈaɪkli sˈɛvɹəl tˈaɪmz hˈɛviɚ ðɐn ðə lˈɑːɹdʒɪst lˈɪvɪŋ ɡˈɛkoʊ, ðɪ ˈɔːlsoʊ nˈuː kˌælɪdˈoʊniən ɹˈækədˌæktɪləs lˈiːkiənəs, wɪð ɐ snˈaʊttəvˈɛnt lˈɛŋθ ˌɛsvˌiːˈɛl ʌv ænd ɐn ˌoʊvɚɹˈɔːl lˈɛŋθ ɪŋklˈuːdɪŋ tˈeɪl ʌv æt lˈiːst .
Gigarcanum delcourti is 50% longer and was likely several times heavier than the largest living gecko, the also New Caledonian Rhacodactylus leachianus, with a snout-to-vent length (SVL) of  and an overall length (including tail) of at least .