https://dzarc.com/entomology <p><strong>Journal of Applied Entomologist </strong>is an open-access, refereed, peer-reviewed research journal that invites the submission of research articles with significant impact on science and the academic community. The journal focuses on critical and innovative research in entomology and provides a fully open-access platform for scholars and researchers to share their findings with practitioners worldwide.</p> Dzarc Publications en-US Journal of Applied Entomologist 2583-1917 https://dzarc.com/entomology/article/view/861 <p><em>Leptogenys birmana</em> Forel, 1900 is a ponerine ant distributed across the Indomalayan region, with extension into the southern Palaearctic. The species had not previously been recorded from Arunachal Pradesh. During fieldwork on 3 March 2025, it was recorded from Budhisatta, near the Deban Range of the Namdapha Tiger Reserve, Changlang district, Arunachal Pradesh, representing a new state record and extending its known distribution in northeastern India. This finding adds to the documented ant fauna of the region and highlights the importance of continued myrmecological surveys in underexplored areas of Northeast India.</p> Srinjoy Das Copyright (c) 2026 Srinjoy Das https://creativecommons.org/licenses/by/4.0 2026-04-01 2026-04-01 6 2 01 03 10.64171/JAE.6.2.1-3 https://dzarc.com/entomology/article/view/908 <p>Morphological convergence is a recurrent outcome of environmental filtering in freshwater ecosystems, where hydrological conditions strongly shape organismal form and function. This study investigates patterns of morphological convergence and habitat specialization among diverse mayfly (order Ephemeroptera) lineages distributed across contrasting flow regimes, including lentic, low-flow lotic, and high-velocity stream environments. Using comparative morphometric analyses and phylogenetically informed models, we quantify variation in body flattening, limb robustness, gill structure, and attachment-related traits. Results reveal repeated evolution of dorsoventrally flattened bodies and expanded femora in high-flow specialists, traits that enhance substrate adherence and reduce drag. Conversely, taxa inhabiting slow-flow or standing waters exhibit streamlined or cylindrical forms, elongated gills, and increased swimming appendage surface area, facilitating respiration and maneuverability. Phylogenetic analyses indicate that these trait syndromes have evolved independently multiple times, demonstrating strong ecological filtering across lineages. Habitat specialization is associated with reduced morphological disparity within flow categories but increased divergence among regimes. Our findings highlight the interplay between hydrodynamic forces and evolutionary trajectories, underscoring the role of flow-mediated selection in structuring morphological diversity.</p> Chiranjeev Pandey Gagan Singh Guru Copyright (c) 2026 https://creativecommons.org/licenses/by/4.0/ 2026-04-07 2026-04-07 6 2 04 09 10.64171/JAE.6.2.4-9