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Andricus dentimitratus
''Andricus dentimitratus'' is a gall forming wasp in the genus ''Andricus''. The adults lay their eggs on various species of oak and the developing larvae causes the trees to create a large ornate gall. The oaks parasitised include ''Quercus frainetto'', ''Q. petraea'', ''Q. pyrenaica'', ''Q. pubescens'' and ''Q. robur''. The gall is formed out of the cup of the acorn. In cross-section it resembles a mushroom. It is woody, maroon, shiny and sticky. It grows up to 25 mm high and 20 mm wide. What resembles the head of the mushroom is lobed or toothed in various ways. The insect emerges from the narrowing, between the head and base.〔H. Buhr, Bestimmungstabellen der Gallen (Zoo- und Phytocecidien) an Pflanzen Mittel- und Nordeuropas. 2 Bände. Fischer, Jena 1964/1965.〕
==Lifecycle==
Many species of ''Andricus'' including ''A. dentimitratus'' have a complex lifecyle. There is an agamic stage that produces only parthenocarpic females and a sexual stage where males are also produced. The agamic stage produces the large galls illustrated, however, although the sexual stage is known to occur, the galls of this stage have not been described for ''A. dentimitratus''.〔J. Pujade-Villar, D. Bellido, G. Segú & G. Melika, Current state of knowledge of heterogony in cynipidae (hymenoptera, cynipoidea), Ses. Entom. ICHN-SCL, 11 (1999): 87-107〕
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