Simplify the following text for a Grade 7 native English-speaking person.
Original: The Standing 's day gecko ( Phelsuma standingi ) is an arboreal and diurnal species of gecko , native to southwest Madagascar . It is the largest living species of day gecko .
Simplified: The Standing 's day gecko ( Phelsuma standingi Methuen & Hewitt , 1913 ) is a type of gecko .