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