Four Neotropical species of Sidymella Strand, 1942, S.furcillata Keyserling, 1880, S.longispina (Mello-Leitão, 1943), S.lucida (Keyserling, 1880), and S.kolpogaster (Lise, 1973) are redescribed from both sexes. The holotype of S.nigripes (Mello-Leitão, 1947) is lost and this taxon is considered a species inquierenda. Sidymellaobscura (Mello-Leitão, 1929), S.parallela (Mello-Leitão, 1929), and S.spinifera (Mello-Leitão, 1929) are all nomina dubia. Two new species are described: Sidymellaexcavatasp. nov. (males and females) and S.marmoratasp. nov. (female).

A recent phylogenetic analysis has shown that the genus Stephanopis comprises several different lineages of bark-dweller crab spiders. The ones with South American distribution that present a close relationship with other Neotropical genera like Epicadus, Onocolus, Rejanellus and Epicadinus were recovered in a single clade, with good support and stability. Here, we present a taxonomic review of Stephanopis species attributed to the ‘pentacantha clade’, proposing the new genus Kryptochroma Machado gen. nov. to accommodate them. New distribution records are provided and the following species are described for the first time: Kryptochroma gigas Machado & Viecelli gen. et sp. nov., Kryptochroma hilaris Machado & Teixeira gen. et sp. nov., Kryptochroma quadrata Machado & Viecelli sp. nov. and Kryptochroma septata Machado & Teixeira sp. nov. The species Stephanopis borgmeyeri is considered a nomen dubium, Stephanopis aheneus is a junior synonym of Epicadus tuberculatus, Stephanopis quimiliensis is transferred to Ulocymus and Stephanopis stelloides is transferred to Epicadus, being Epicadus stelloides the senior synonym of Stephanopis salobrensis, Stephanopis trilobata and Epicadus caudatus.

The present corrigendum corrects errors that occured in Machado M., Viecelli R., Guzati C., Grismado C.J. & Teixeira R.A. 2021. Kryptochroma: a new genus of bark-dwelling crab spiders (Araneae, Thomisidae). European Journal of Taxonomy 778: 26–70. https://doi.org/10.5852/ejt.2021.778.1565