| abstract | Ten new species of Arrenurus are described from Mexican Lakes. Two species (tamaulipensis, xochimilcoensis) belong to the typical subgenus, seven species (alloexpansus, colitus, champayanus, anae, costeroae, catoi, apizanus) are members of Megaluracarus and the unusual species A. mexicanus is tentatively assigned to the subgenus Arrhenuropsis. |