A further novel species of Macrobrachium from Brazil (Decapoda, Palaemonidae), lacking a mandibular palp

Journal article

A new species of Macrobrachium from the Paraguay River basin, Brazil, is described. The new species is distinguished from most of its congeners by the absence of a mandibular palp. Morphologically, the new species is similar to M. bouvieri (Sollaud, 1911), with the presence of a postorbital rostral tooth, a straight rostrum, and the presence of a double row of setae without gaps over the teeth along the ventral margin of rostrum, separating it from that species, as well as the other eight species of Macrobrachium lacking a mandibular palp.

Authors: Carvalho, FL; de Grave, S

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Magnolia Press
• Journal: Zootaxa
• Volume: 5759
• Issue: 2
• Pages: 185-192
• Publication date: 2026-02-16
• Acceptance date: 2026-01-02
• DOI: 10.11646/zootaxa.5759.2.6
• EISSN: 1175-5334
• ISSN: 1175-5326
• Language: English
• Keywords: freshwater shrimp; Paraguay River basin; Mato Grosso; new species