6
Suffolk Natural History, Vol. 52
ANDRICUS ?CRYPTOBIUS WACHTL, 1880 AND A. SINGULARIS MAYR, 1870, TWO SPECIES OF GALL WASP (HYMENOPTERA: CYNIPIDAE) ASSOCIATED WITH TURKEY OAK (QUERCUS CERRIS), NEW TO SUFFOLK JERRY BOWDREY Introduction Since the first appearance in Britain of the Knopper, the acorn cup gall of the agamic generation of Andricus quercuscalicis, in the 1960s, there have been great increases in our knowledge of the British cynipid fauna, and a steady increase in the number of gall wasps recorded in the country. Many of these have now been found in Suffolk, adding considerably to the total recorded by Morley (1935). Recently, two species associated with Q. cerris have been found for the first time in East Suffolk, one of which is also the first record for the British Isles. Andricus ?cryptobius Wachtl, 1880 Andricus ?cryptobius was added to the British list from a gall collected at Dunwich Heath, East Suffolk (TM474677) on 27.v.2015 (Bowdrey, 2015). An adult female emerged from the gall in the first half of June 2015. Although the female wasp matched well with the descriptions of A. cryptobius in Melika (2006) as well as in hitherto unpublished keys in the forthcoming major work on European oak gall wasps (Stone et al., in prep.), its identity cannot conclusively be established, as there is the possibility that it might represent the sexual generation of a species already described and named from its agamic generation. The gall comprises an enlarged bud (Plate 1), the scales of which surround an inner gall, described by Melika (op. cit.) as resembling an apple pip. A single female emerged in June 2016 and its identity was provisionally confirmed by George Melika as Andricus cryptobius (Melika, pers. comm.). At Dunwich Heath, three galls were originally found (one collected). The galls were on a young tree adjacent to the footpath running alongside Docwra’s Ditch. Searches in 2016 failed to locate any more cryptobius galls at Dunwich or on Turkey oaks at several other East Suffolk localities. No corresponding agamic generation of this species is currently known.
In 2016 a second new Suffolk gall wasp was discovered in East Suffolk. Andricus singularis Mayr, 1870 Andricus singularis was added to the British list by Jennings (2014) who first found its galls at Cuxton, in Kent, in 2010. The galls comprise deformed and swollen shoots with a cluster of shortened, stunted leaves (Plate 2), with a single larva (Plate 3) located in a central, inner cell within the gall. Galls remain attached to the host plant after emergence of the adult insect, the emergence hole being clearly visible. On 19.v.2016 I was examining Turkey Oaks (Quercus cerris) growing beside the footpath between Cranes and Dodds Woods, Benhall (TM363362), searching for galls of A. cryptobius. Instead of these, some other, unfamiliar bud galls were found, with other, similar galls being located on a sapling growing in the nearby hedge at Dead Lane, Benhall (TM366633). Trans. Suffolk Nat. Soc. 52 (2016)