The species is only known from the surroundings of Iquitos (04 00’ S, 73 26’ W and 03 50’ S, 73 22’ W, ca. 120 masl), Department of Loreto, Peru (Moravec and Köhler, 2007).
Habitat and Ecology
Chiasmocleis magnova can be found in disturbed unflooded Amazonian lowland forest with sandy substrates and in disturbed terra firme forest at the alluvial zone. Individuals can be found during the daytime, within the leaf litter or on top of fallen trees. They appear to feed on ants, and the presence of large unpigmented eggs in the holotype suggests terrestrial mode of reproduction. Other microhylids found in sympatry with C. magnova include Chiasmocleis bassleri and Hamptophryne boliviana. Males and larvae of C. magnova are unknown (Moravec and Köhler, 2007).
The holotype is a gravid female collected in March. Therefore, it is possible that the species reproduces at least in the wettest period of the year (February-May) (J. Moravec, pers. comm.).
No population status information is currently available for this species.
Threats include deforestation and urbanization of the landscape, road network building and white sand mining (J. Moravec, pers. comm.).
The paratype comes from a forest study area of the Universidad Nacional de la Amazonia Peruana (UNAP, in Iquitos) called “Arboretum”. On one side, this area is not cleared (a regular net of trails is managed inside only). On the other hand a new campus of UNAP was built recently just at the margin of the “Arboretum”. This made this area accessible and considerably increased anthropogenic pressure to it. The holotype was collected in a territory which was (is?) a property of UNAP and the University had its field station there. Therefore, there is a chance that this area might be saved from the anthropogenic changes taking place in its surroundings, although the university's long-term plans are unknown. A nature reserve lies between both localities, which could provide the species with necessary protection (J. Moravec, pers. comm.).
The occurrence of Chiasmocleis magnova in the Zona Reservada Allpahuayo-Mishana has to be confirmed (J. Moravec, pers. comm.).
Chiasmocleis magnova can be distinguished from other similar species through a combination of morphological characters and colour patterns (Moravec and Köhler, 2007).
Jiri Moravec 2008. Chiasmocleis magnova. In: IUCN 2014