Abstract
Four species of Guaranidrilus are described from the broad‐leaved tropical rain forest region on the eastward mountain slopes of Serra do Mar, in the Parelheiros District, southern part of the municipality of São Paulo, Brazil. These worms are named G.finni, sp. n., G. atlanticus, sp. n., G. joanae, sp. n., and G. athecatus, sp. n. A table is given comparing the principal characteristics of these animals with those of the five species known with certainty to belong to the genus Guaranidrilus.

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