Gibbesia neglecta ( Gibbes, 1850 )

Bento, Rodrigo Tadeu, Dall´Occo, Paola Lupianhes & Melo, Gustavo Augusto Schmidt De, 2008, On the diagnostic characters of the genus Gibbesia (Crustacea: Stomatopoda: Squillidae), Zootaxa 1939 (1), pp. 61-64 : 62-63

Gibbesia neglecta ( Gibbes, 1850)

( Fig. 1A, B )

Squilla neglecta Gibbes, 1850: 200 .— Miers, 1880: 23.— Lemos de Castro, 1955: 22, fig. 17, pl. 6, fig. 38, pl. 15, fig.

49.— Manning, 1969: 181, figs. 50b, 51.— Gore & Becker, 1976: 152, fig. 10.— Gomes-Corrêa, 1998: 290. Gibbesia neglecta .— Manning & Heard, 1997: 313, figs. 14a–c.— Foster, Thoma & Heard, 2004: 56, figs. 2a, 9a–e.

Diagnosis. Rostral plate anteriorly truncate. Median carina of carapace with anterior bifurcation. Dactylus of raptorial claw with 5 teeth. Mandibular palp absent. 5 epipods present. Lateral process of fifth thoracic somite wide, spatulate with rounded apex. Telson flattened, broader than long; prelateral lobes reduced; posterior margin with rounded lateral denticle, 5–7 triangular intermediate denticles, and 2–4 submedian denticles; ventral surface concave, with small postanal keel. Proximal segment of exopod of uropod with 7–9 movable spines.

Distribution. Western Atlantic: North Carolina, South Carolina, Georgia, Florida, Gulf of Mexico and Brazil (Ceará, Paraíba, Pernambuco, Alagoas, Sergipe, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina and Rio Grande do Sul).

The species is found on mud and sand bottoms with detritus, at depths from 15 to 540 meters.

Remarks. The material analyzed in Brazil varied somewhat in respect to the number of submedian denticles on the telson, either 4 or 5. According to Manning (1969), this number varies between 2 and 4. The submedian carinae of the thoracic somites may be divergent. The submedian denticles of the telson vary widely in form in both males and females; both may bear fused denticles with a lobular appearance. The inner margin of the uropodal protopod may be serrate or smooth in both sexes.

Manning (1966) noted several differences between specimens collected in Brazil and in the Gulf of Mexico, such as: anterior tubercle of the seventh thoracic somite absent in specimens from the north, but present in those from the south; all the lateral abdominal carinae possess spines in the specimens from the Gulf of Mexico, whereas the carinae of the first two somites in the Brazilian specimens do not possess spines; and the submedian abdominal carinae of specimens from Brazil diverge little compared to specimens from the Gulf. These intra-specific differences are not sufficient to separate the specimens from the two areas.

Figures

FIGURE 1. A, C, lateral processes of thoracic somites. B, D, dactylus and propodus of raptorial claw. A–B, Gibbesia neglecta, male, Brazil (Museu de Zoologia da Universidade de São Paulo, MZUSP 2063). C–D, Gibbesia prasinolineata, female, Brazil (Museu de Zoologia da Universidade de São Paulo, MZUSP 4759).