author(s)
Sayak Chakraborty and Sagata Mondal

abstract
The present paper documents/discuss the preliminary study on litter insect abundance and diversity of insect species in diversity through pitfall trap in different ecosystems of South 24 Parganas District conducted during November, 2021- March, 2022. A total of 905 insects from 8 orders, 25 families were recorded. This study shows that Hymenoptera (44%) was the most dominant order according to total number of individuals, followed by Coleoptera (26%), Diptera (17%), Hemiptera (5%), Collembola (4%), Orthoptera (2%), Isoptera (1%) and Dictyoptera (1%). The present study was also conducted to determine the abundance of insects species; species richness, dominance and evenness of insect fauna from different ecosystems. The Simpson’s Index diversity is highest in Guava Orchard (0.345) and lowest in Medicinal Plants’ Garden (0.281). The species richness, evenness and diversity of insects were calculated by Margalef’s Index, Pielou’s Index and Shannon-Wiener Index respectively.