The description and ecology of a novel diminutive species of Macrobrachium Spence Bate, 1868 (Decapoda: Caridea: Palaemonidae) from Amazonia, the first member of the genus lacking a mandibular palp

Freshwater shrimps of the genus Macrobrachium Spence Bate, 1868 are widely distributed in the Neotropics, with several potential species still undescribed, particularly in ecologically diverse regions such as the Amazon Basin. During ecological surveys of upland streams in the Ducke Forest Reserve near Manaus, Brazil, a previously undocumented species was discovered. This study describes Macrobrachium magalhaesisp. nov. and its ecology. Specimens were collected from ten stream reaches using standardized active sampling. Morphological analyses revealed that this is the first species in the genus lacking a mandibular palp. The species occurs primarily in shallow, second-order streams with a high proportion of coarse litter. Generalized linear models and distribution-based tests revealed a significant association with stream depth and velocity, and substrate composition, suggesting ecological specialization and niche partitioning relative to sympatric species of Palaemonidae. The study highlights the importance of integrating ecological data into taxonomic descriptions to improve species delimitation and understand habitat use among tropical freshwater crustaceans.

• Publication year

  2025

• Venue

  Journal of Crustacean Biology

• Publication date

  2025-07-22

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1093/jcbiol/ruaf049
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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