Plate 33 from Merian's 'Insectorum Surinamensium' showing split tongue of a sphinx moth

This illustration is from the 1719 edition of 'Insectorum Surinamensium', and shows the detail of Merian's work. The sphinx moth has a split tongue for only a brief period of its life, and was not recorded until this publication. It has been theorised that Merian observed this detail using a magnifying glass.

Full title: 'Mariae Sibillae Merian Dissertatio de generatione et metamorphosibus insectorum Surinamensium: in quâ, praeter vermes & erucas Surinamenses, earumque admirandam metamorphosin, plantae, flores & fructus, quibus vescuntur, & in quibus fuerunt inventae, exhibentur : his adjunguntur bufones, lacerti, serpentes, araneae, aliaque admiranda istius regionis animalcula'