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Gromphadorhina oblongonota (often misspelled oblongata or oblongonata), the wide-horned hisser, is a large, flightless species of hissing cockroach from southern Madagascar, and one of four members of the genus Gromphadorhina. This species is common in the pet trade, but it is difficult to distinguish from G. portentosa and is commonly confused with it, although oblongonota tends to be significantly larger and somewhat darker than portentosa.