Synalpheus dardeaui ( Ríos & Duffy, 2007 )

Paixão, Pedro Henrique, Terossi, Mariana, Pasinatto, Karmine, Bochini, Gabriel Lucas & Almeida, Alexandre Oliveira, 2025, Shrimps of the genus Synalpheus Spence Bate, 1888 (Decapoda: Alpheidae) from Northeast Brazil region, Zootaxa 5666 (1), pp. 1-52 : 20

Synalpheus dardeaui ( Ríos & Duffy, 2007)

Material examined: Pernambuco — Tamandaré: 1 M, Carneiros , 20.vii.2019, 8°41′32′′S 35°4′25′′W, 3.5 m depth, in sponge, MOUFPE 21620 .

Description: Ríos & Duffy (2007) and Oliveira et al. (2015).

Distribution: USA (North Carolina, Florida), Belize, Panama, Curaçao, and Brazil (Pernambuco and Bahia) ( Ríos & Duffy, 2007; Hultgren et al. 2010; Anker et al. 2012; Oliveira et al. 2015; this study).

Ecology: In sponges [ Spheciospongia vesparium ( Lamarck, 1815) , Lissodendoryx colombiensis Zea & van Soest, 1986 , and Ircinia cf. strobilina ( Lamarck, 1816) ]; on seagrass banks, among roots in mangroves with a high abundance of sponges; in heterosexual pairs; shallow waters to 65 m ( Ríos & Duffy, 2007; Hultgren et al. 2010; Anker et al. 2012; Oliveira et al. 2015). Sampled in association with a sponge (unidentified).

Remarks: Oliveira et al. (2015) highlighted differences between their material and the type series of the species, interpreting these as intraspecific variations (for more details, see Oliveira et al. 2015, Remarks and Fig. 2 , and Ríos & Duffy, 2007, Figs. 3–6 ). The material analyzed in this study is consistent with the variations reported by Oliveira et al. (2015). Furthermore, with the new record, this study fills a gap in the species’ known distribution along the Brazilian coast.

Figures

FIGURE 2. Sampling locations of specimens of Synalpheus Spence Bate, 1888 analyzed in this study. A, Baía de Suape, Cabo de Santo Agostinho, Pernambuco; B, Praia dos Carneiros, Tamandaré, Pernambuco; C, Praia de Pontas de Pedra, Goiana, Pernambuco; D, Fernando de Noronha Archipelago, Pernambuco; E, São Pedro e São Paulo Archipelago, Rio Grande do Norte; F, Dredging on the continental shelf off Recife, Pernambuco. Photos: A, B, E—G.L. Bochini; C—T.E.R. Cavalcanti; D—K. Pasinatto; F—P.H. Paixão.

FIGURE 3. Substrates where the specimens of Synalpheus Spence Bate, 1888 analyzed in this study were found.A, Rhodoliths; B, Sediment; C, Sponge where the colony of S. brooksi Coutière, 1909 was found; D, Sponge morphotype where the possible communal groups of S. hoetjesi Hultgren, Macdonald & Duffy, 2010 and S. ul (Ríos & Duffy, 2007) were found, arrows indicate the presence of shrimps. Photos A–D: P.H. Paixão.

FIGURE 4. Synalpheus androsi Coutière, 1909: female from the continental shelf off Recife, Pernambuco, Brazil [DZ/UFRGS 7050]. A, frontal region, dorsal view; B, third pereiopod, left side, lateroventral view; C, major chela, right side, mesial view; D, same, lateral view. Scale bars: 0.5 mm.

FIGURE 5. Synalpheus barahonensis Armstrong, 1949: female from the continental shelf off Recife, Pernambuco, Brazil [MOUFPE 21870]. A, frontal region, dorsal view; B, major chela, left side, mesial view; C, same, lateral view; D, minor chela, right side, mesial view; E, same, lateral view; F, second pereiopod, left side, lateral view; G, third pereiopod, right side, lateral view. Scale bars: A–F, 0.5 mm; G, 0.3 mm.

FIGURE 6. Synalpheus barahonensis Armstrong, 1949: female from the continental shelf off Recife, Pernambuco, Brazil [MOUFPE 21870]. A, pleon, left view; B, right uropod, dorsal view; C, left uropod, dorsal view; D, third maxilliped, right side, lateral view; E, telson, dorsal view. Scale bars: A, 0.5 mm; B–E, 0.3 mm.