FIGURE 1. Map of the study region showing the type locality of Echinolittorina nielseni sp. nov. in Caldera, northern Chile.

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FIGURE 2. Shells of Echinolittorina nielseni sp. nov. and of two extant littorinids: 1-8, Echinolittorina nielseni sp. nov., SGO.PI 23.100 (holotype) (1 and 2), NHMUK PAL PI TG 26769 (paratype) (3 and 4), NHMUK PAL PI TG 26770-26773 (paratypes) (5-8); 9-13, Echinolittorina peruviana (Lamarck, 1822), NHMUK acc. no. 2176 (9 and 12), NHMUK 20001268 (10), NHMUK 20001269 (11), NHMUK unnumbered (13); and 14 and 15, Littoraria varia (Sowerby, 1832), NHMUK 1850.4.23.273 (14) and NHMUK 1850.4.23.274 (15). 13 is a scanning electron micrograph showing shell sculpture. 2, 8, 12, 13 are abapertural views and 4 is a basal view; others are apertural views. Collection localities: Chile (El Morro, Atacama) = 1-8, Chile (Valparaíso) = 9 and 12, Perú (Lagunilla Beach, Paracas) = 13, Panama = 14 and 15; others are unknown.

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