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The subgenus Anicla, commonly known as green cutworms, harbours some of the owlet moths (Lepidoptera: Noctuinae), whose larvae are notable for their economic importance. Knowledge of the immature stages for this group is available for three of the nine described species. Anicla infecta Ochsenheimer, 1816 is widely distributed in the Americas and is especially abundant in agricultural ecosystems. However, in the Neotropics, its economic damage can be confused with sympatric species, including Anicla ignicans (Guenée, 1852), whose distributions overlap in most parts of the American continent. In this sense, here, the identity of A. ignicans is investigated through its geographical distribution, based on molecular and morphological data. Additionally, the morphological and behavioural traits of immature stages were described in detail, information about its geographical distribution and larval host plants was gathered, and the species' biological parameters from larvae reared on an artificial diet were determined. Anicla ignicans is distributed throughout the Neotropical region, preferably in areas with xeric and/or grass‐dominated ecosystems. The eggs present valuable characters to distinguish A. ignicans from other owlet moth species, such as the reduced number of ribs, the way the micropyle openings are arranged and the shape of the aeropyles. However, the larvae show very similar chromatic polymorphisms to other Anicla species. Although A. ignicans prefer to feed on grasses, it was observed that more than 85% of the larvae that were fed with a modified bean‐based Greene diet survived. Additionally, the percentage of time for each phase of development obtained here is very similar for the different species of Anicla, regardless of the temperature or feeding of the larvae. [ABSTRACT FROM AUTHOR]