Xiphopenaeus kroyeri (Heller, 1862) Examined material. Municipality of Amapá: Sucuriju River (01°40’35.7”N, 49°55’53.92W), iii.1998, cols. I.M. Vieira, OM. Costa and A.C.Souza, 2 males and 1 female (IEPA162); collection in tidal pools in the Sucuriju River estuary (01°40’23.9”N, 49°54” 56.7W), 22.vii.2002, I.M. Vieira and O.M. Costa, 1 male and 36 females (IEPA364); mouth of Sucuriju River (01°40’09.18”N, 49°55’07.34”W), 4.v.2004, I.M. Vieira, 1 male and 3 female (IEPA520). Municipality of Oiapoque: mouth of Oiapoque River (04°04’25.71”N, 51°38’35.31”W), 22.viii.2013, cols. I.M. Vieira, A.G. Santiago and E.O.Galeno, 2 females (IEPA 1617); idem, collection using trap (04°04’25.71”N, 51°38’35.31”W), 21 a 22.viii.2013, cols. I.M. Vieira, A.G. Santiago and E.O.Galeno, 1 male (IEPA 1618); idem (4°19’49.47”N, 51°11’47.01”W), 21 a 22.viii.2013, cols. I.M. Vieira, A.G. Santiago and E.O.Galeno, 1 male (IEPA 1742); Mouth of Cassiporé River (03°52’53.40”N, 51°08’36.03”W), 24.viii.2013, 21 a 22.viii.2013, cols. I.M. Vieira, A.G. Santiago and E.O.Galeno, 3 males (IEPA1619) (Figure 2). Geographic distribution. Punta Piaxtla, Sinaloa, Mexico to Paita, Peru; North Carolina to Gulf of Mexico, Caribbean Sea to Santa Catarina (Perez-Farfante & Kensley 1997) Previous records. (Costa et al. 2003) Distribution in Amapá state. Estuaries of the Sucuriju, Oiapoque and Cassiporé rivers. Ecological notes. Inhabits muddy or sandy bottoms, from 1 to 70 m deep, abundant in depth up to 30 m. Marine but can enter brackish waters and exceptionally fresh waters (Cervigon et al. 1992). Macrobrachium jelskii (Fig. 4), Palaemon carteri (Fig. 5), M. amazonicum (Fig. 3), M. surinamicum (Fig. 4), M. brasiliense (Fig. 4) and E. burchelli (Fig. 1) were the species with greatest geographic distribution in Amapá. Regarding the sampled habitats, the greatest richness of shrimp occurred in rivers and streams, but these also occurred in Amazonas-wells (Table 3). Considering the habitat types, rivers and streams had high species richness, but streams and estuaries were high in Shannon diversity (Table 3).

Published as part of Vieira, Inacia Maria, Silva, Luiz Maurício Abdon, Almeida, Alini Gomes Santiago De, Almeida, Danilo Pelaes De, Silva-Júnior, Orleno Marques & Tavares-Dias, Marcos, 2022, Diversity, distribution and new records of freshwater and estuarine shrimp in the state of Amapá, eastern Brazilian Amazon region, pp. 41-71 in Zootaxa 5178 (1) on page 65, DOI: 10.11646/zootaxa.5178.1.3, http://zenodo.org/record/7021864