Porrostoma is a genus of net-winged beetles in the family Lycidae, occurring in Australia and New Zealand.

Most of the >100 species in Porrostoma were formerly placed in other genera such as Metriorrhynchus, and as a result, the spelling of the species names is subject to much confusion in the literature and online sources (e.g. [1]) but under ICZN Article 31 the correct spelling of all adjectival names requires agreement with the neuter gender of the genus, while all names that are nouns (or potentially nouns; e.g., eremita,[2] eucerus,[3] frater,[4] hexastichus,[5] monticola,[6] nigricauda,[7] paradoxa,[8] quinquecavus,[9] rhipidius[10], and trichocerus[11]) must retain their original spelling, and do not change.

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