Rotifer diversity in a central Mexican pond

A survey of rotifers from a small pond (less than 2 ha in area and 3 m deep ), located at Kilometer 28 in the federal highway Ixtlahuaca-Jilotepec (19 degrees 49' 13 " N, 99 degrees 42' 22 " W) at an altitude of 2503 m above s ea level, resulted in a total of 78 species. From these, 20 are new records for Mexico. This study confirms the presence of some of the rotifer specie s listed only in earlier studies. Comments on some species are made from a zoogeographical point of view.