Three new species of Macrelmis Motschulsky (Coleoptera: Elmidae: Elminae) from Southeastern Brazil with new definition of species groups to the genus Author Passos, Maria Inês Silva Dos Author Miranda, Gustavo Silva De Author Nessimian, Jorge Luiz text Zootaxa 2015 4058 2 195 210 journal article 39260 10.11646/zootaxa.4058.2.3 aef58d69-0e0c-4ad8-8e27-3a00ea2bc448 1175-5326 241270 7BF705F4-BB24-4BC4-9430-A2AB8A990DDF amazonica new species group Diagnostic character : parameres significantly shorter than aedeagus; aedeagus with rounded apex ( Figs. 3A, C ). Species : Macrelmis amazonica , M. terea , M. thorpei , and M. tityra . Distribution ( Fig. 6 ): Brazil : Rondônia ( Hinton 1945 ) and Amazonas ( Hinton 1946 ). French Guiana : Saint- Laurent-du-Maroni ( Hinton 1946 ). History of the group : Macrelmis amazonica was described as part of the graniger species group ( Hinton 1945 ), but the male genitalia of these four species share undeniable similarities, with the abovementioned characters. Macrelmis terea , M. thropei and M. tityra were considered as part of the aristae group by Hinton (1946) based on presence of pronotal sublateral carinae, but this character is also present in other species outside the group that do not have same male genitalia characters. TABLE 1. Diagnostic characters of the species groups. Species group Characters Size of parameres in Presence of Presence of Shape of aedeagus Presence of relation to the aedeagus setae on the spongy sublateral carinae on parameres structures the pronotum covering the parameres alea Subequal Present Present Tapering from the base Present, prominent to the apex