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FIGURE 1. (A) The Ajuruteua Peninsula in the Bragança region of the state of Pará, Amazon region, northern Brazil. (●) Locations at which the alpheid shrimps, Leptalpheus forceps Williams, 1965 and Leptalpheus marginalis Anker, 2011, were collected; (B) Muddy-sandy intertidal habitat located on the Ajuruteua Peninsula where the specimens of alpheid shrimps were collected from callichirid burrows; (C) the burrowing "ghost" shrimp, Lepidophthalmus siriboia Felder & Rodrigues, 1993 (Callichiridae) (♂ specimen; CL=14.41 mm, TL=48.95 mm; dorsal view), the host species of the two Leptalpheus species collected on the Ajuruteua Peninsula. Photographs by D. J. B. Simith.