There are around 3,300 species , ranging from the diminutive `` Nannarrup hoffmani '' ( less than 12 mm or in in length ) to the giant `` Scolopendra gigantea '' , which may exceed .
There are around 3,300 species , ranging from the diminutive `` Nannarup hoffmani '' ( less than half an inch in length , c. 12 mm ) to the giant `` Scolopendra gigantea '' , which may exceed 30 cm .