Freswater shrimps from the cerrado hydrographic basins: geographical distribution and key of identification
DOI:
https://doi.org/10.6008/CBPC2179-6858.2020.004.0009Keywords:
Diversity, Decapoda, Macrobrachium, Taxonomy, ConservationAbstract
Freshwater shrimp for genus, Macrobrachium (Spence Bate, 1868) are widespread in the Americas and, numerically, this is the dominant genus of the Palaemonidae family. The State of Maranhão doesn’t have research associated with freshwater crustaceans, with this being the first study period carried out with the objective of showing registered taxonomic species information and map of geographic occurrences, biological and ecological characteristics, a Macrobrachium genus identification key for the State, as well as conservation aspects. For this, eight streams in eastern Maranhão were sampled with gill nets, sifters and dragnets being ran across the bottom and in submersed marginal vegetation for a period of 20 minutes along a 150-meter stretch. In the laboratory, specimens were identified, measured and sexed. A total of 526 specimens were collected, distributed in five species, being: M. carcinus (N=01), M. olfersii (N=55), M. acanthurus (N=116), M. amazonicum (N=119) and M. jelskii (N=235). Ovigerous females were only registered in M. acanthurus and M. jelskii, M. jelskii showed fertilities from 1 to 65 eggs, while for the only ovigerous female from M. acanthurus, 662 eggs were counted. An identification key of the genus Macrobrachium was also prepared for Maranhão. Thus, the records of these species for the State and expansion of the distribution area were confirmed, with occurrence maps.
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