Atya gabonensis, Giebel, 1875

Atya gabonensis View in CoL

In total, 42 individuals were sampled: 17 (40.5 %) males and 25 (59.5 %) females. The carapace length of males ranged from 19.54 to 58.49 mm,with an average of 41.26 ± 11.01 mm, while that of females ranged from 25.74 to 46.40 mm, with an average of 39.18 ± 5.28 mm. The overall average was 40.02 ± 7.92 mm.

The weight of males ranged from 3 to 85 g (mean = 35.6 ± 26.1 g), while that of females ranged from 8 to 44 g (mean = 26.7 ± 18.7 g); the overall average was 30.3 ± 18.7 g. The relationship between carapace length and individual weight was described by the potential equation y = 0.0002CL 3.1895, where y is the weight and CL is the carapace length in mm, with a determination coefficient (R 2) of 97 %. There was no statistically significant difference between sexes for the CL × weight relationship (p <0.05) ( Fig. 3 View Figure 3 ).

The total length of males ranged from 51.4 to 137.6 mm, with an average of 103.0 ± 24.1 mm; females ranged from 75.6 mm to 124.1 mm,with an average of 102.5 ± 12.0 mm. The overall average was 102.7 ± 17.7 mm. The CL × CW relationship was the only one that showed no statistically significant difference between sexes ( Tab. 1). The equations that describe each of these relationships, as well as each R², are shown in Figure 4 View Figure 4 . Both sexes presented negative allometry for the CL × TL relationships and CL × CW and isometry for CL × AL.In other relationships, there were different growth patterns between males and females. Males presented positive allometry for most of relationships with third pereopod articles (CL × MerL, CL × CarL, CL × DacL), while females showed isometry. On the other hand, females presented isometry for CL × PL and CL × PH, and positive allometry for CL × AW, while male presented negative allometry for all these relationships. Males presented isometry for the CL × AmL and CL × AmW relationships and decreasing ratio Am L/W. ( Tab. 2, Fig. 4 View Figure 4 ).