Loamaggalangta pedderensis gen. & sp. nov.: A new mayfly from Tasmania (Ephemeroptera: Leptophlebiidae: Atalophlebiinae)

The genus Loamaggalangta gen. nov. is established to accommodate a species of leptophlebiid mayfly from Tasmania. Adults and nymphs of Loamaggalangta pedderensis sp. nov. are described and figured. Nymphs have only been collected from greater than 5 m below the surface in the impounded Lake Pedder. Nymphs of additional species from mainland south‐eastern and south‐western Australia probably also belong in the genus, but formal descriptions must await associations with adults.