Macrobrachium macrobrachion (Herklots, 1851)

Konan, Mexmin K., Allassane, Ouattara, Beatrice, Adepo-Gourene A. & Germain, Gourene, 2008, Morphometric differentiation between two sympatric Macrobrachium Bates, 1868 shrimps (Crustacea: Decapoda: Palaemonidae) in West-African rivers, Journal of Natural History 42 (31 - 32), pp. 2095-2115 : 2110-2111

Macrobrachium macrobrachion (Herklots, 1851)

In the male the merus is 0.66–0.95 times as long as the palm and 0.18–0.27 times as long as broad; carpus is 0.59–0.87 times as long as palm and 0.21–0.38 times as long as wide; ischium is 0.21–0.34 times as long as broad.

In the female the merus is 0.71–0.87 times as long as palm; carpus, 0.70–0.82 times as long as palm and 0.24–0.35 times as long as wide.

The second cheliped length is much shorter (male: 1.70 to more than 3.73 times as long as carapace; female: 1.73 to 2.76 times as long as carapace). The palm width is smaller (0.17 and 0.16 times carapace length for male and female, respectively).

Conclusion

From the present study, we found that metric variables could be applied in the identification of populations of M. vollenhovenii and M. macrobrachion . The main discriminating characters of both species were related to form and size of the second pereiopods.

To acquire precision of morphometric variability and differentiation among these species, genetics and landmark morphometric analyses should be applied in future studies of these shrimps.