The aquatic Adephaga of the Makay, central-western Madagascar, with description of two new diving beetle species (Coleoptera, Gyrinidae, Haliplidae, Noteridae, Dytiscidae) Author Ramahandrison, Andriamirado Tahina https://orcid.org/0000-0002-0833-8730 Departement de Biologie et Ecologie Vegetales, Faculte des Sciences, BP 906, Universite d'Antananarivo, Antananarivo, Madagascar & Sorbonne Universite, Institut de Systematique, Evolution, Biodiversite (UMR 7205), MNHN SU CNRS EPHE UA, Case 05, 7 quai St Bernard, Paris, France Author Rakouth, Bakolimalala https://orcid.org/0000-0001-5710-2006 Departement de Biologie et Ecologie Vegetales, Faculte des Sciences, BP 906, Universite d'Antananarivo, Antananarivo, Madagascar Author Manuel, Michael Sorbonne Universite, Institut de Systematique, Evolution, Biodiversite (UMR 7205), MNHN SU CNRS EPHE UA, Case 05, 7 quai St Bernard, Paris, France manuel1570@yahoo.fr text ZooKeys 2022 2022-11-02 1127 1 60 http://dx.doi.org/10.3897/zookeys.1127.85737 journal article http://dx.doi.org/10.3897/zookeys.1127.85737 1313-2970-1127-1 4759AFC32EFD47A7853F645FB32829BA D72971CE12A85992AFFD69F186474E85 Hydaticus petitii Aube , 1838 Type locality. Madagascar. Material examined. 1 ♂ : MAK-52. Distribution. Madagascar, widespread ( Guignot 1959-1961 ; Bukontaite et al. 2015 ). Habitat in study area. This species was collected once, in northern inner Makay, in a calm pool (~ 3 m x 7 m) on the bottom of a canyon, with inflow and outflow from the nearby Ampasimaiky River. This pool was rather deep (> 1 m), with bottom of sand covered with a thin layer of clay, almost without vegetal detritus, with moderately turbid water and no vegetation. The environment was semi-forested and the pond was surrounded by Ravenea palm trees. As a rule this Malagasy endemic species is encountered in forest massifs in more or less undisturbed habitats.