Krone was the discoverer of the famous Iporanga-blind catfish, which was named Pimelodella kronei, a troglobitic fish species unique to the waters of some caves in the region and somewhat of Brazilian speleology [REF].
By 1906, when searching the sambaqui (Tupi: Tamba'ki = pile of shells) Morro Grande, situated between Rio das Pedras and Rio Comprido located within the Juréia Ecological Reserve, Krone found a very curious stone statue known in scientific circles as the Iguape Idol.