Figure 3 from: Ledesma E, Jiménez-Valverde A, de Castro A, Aguado-Aranda P, Ortuño VM (2019) The study of hidden habitats sheds light on poorly known taxa: spiders of the Mesovoid Shallow Substratum. ZooKeys 841: 39-59. https://doi.org/10.3897/zookeys.841.33271

Figure 3 Species accumulation curves for the complete inventory of the Sierra de Guadarrama National Park. A Sample-based species accumulation curve using subterranean sampling devices (SSDs) as effort units (empty circles); extrapolation curve for a sampling effort of 66 SSDs (thick black line); 95% confidence interval as grey bands, and Chao2 curve (stripped line). Vertical line marks the realized sampling effort (33 SSDs) B Species accumulation curves of singleton, doubleton, unique and duplicate species.