Photo credit: Manuel Cano Alfaro (Guatemala) Review: Abdel Rahman El Gamal This specimen of Daphnia belonged to the fauna of Lake Amatitlan, Guatemala Introduction: Daphnia is a large genus comprising over 200 species of small freshwater crustaceans that belong to the family Daphniidae and the order “Cladocera”. These small crustaceans of 1–5 millimeters in length are commonly …