Lasioptera arundinis Schiner, 1854
Phragmites australis, France, dép. Somme, Frise, 23.i.2023 © Sébastien Carbonelle: opened gall with larva and the remarkably elongated cocoons
larva, compared with a larva of Microlasioptera flexuosa (below).
Phragmites australis, Weert, Wijffelterbroek, 19.ix.2019 © Carina Van Steenwinkel: galled lateral shoot
galled stem, after removal of the leaf sheaths
larvae in their gall chambers
Phragmites australis, Belgium, prov. Namur, Virelles, Pré de Fagne © Sébastien Carbonnelle: lateral shoot
Phagmites australis, Denmark © Simon Haarder: galled lateral shoot
the internodes are strongly shortened
larvae in the pith that is coloured brown by fungus
larva ventral, with spatula
the larvae live exclusively in lateral shoots, that have been formed after the main shoot has been damaged by some external cause. The lateral shoot is shortened en somewhat thickened, the leaves are densely overlapping. The result is a more or less fusiform obliquely ascending gall of 15-30 cm. The pith is brownish black, caused by a fungus that is associated with the midge. In the pith lie a number of chambers, each with a pale redddish yellow larva or a pupa. Univoltine.
Phragmites australis, France, dép. Somme, Frise, 23.i.2023 © Sébastien Carbonelle: spatula of Lasioptera hungarica (at left) and L. arundinis with lengthened and elongated central element, and recurved lateral elements.
spatula (from Kieffer, 1901a)
prosternum with spatula (from Möhn, 1955a)
Lasioptera species and relatives are dependent on the symbiotic fungus Radulidium subulatum.
Baetens & De Bruyn (1999a), Buhr (1965a), Dauphin & Aniotsbehere (1997a), Gagné (2010a), de Vere Graham & Gijswijt (1998a), Haarder, Bruun, Harris & Skuhravá (2016a), Houard (1908a), Kieffer (1901a), Nartshuk (2011a), Redfern & Shirley (2011a), Rohfritsch (1992a, 2008a), Roskam (2009a), Roskam & Carbonnelle (2015a), Sánchez (2016a), Schwarzländer & Häfliger (2000a), Simova-Tošić, Skuhravá & Skuhravý (2000a), Skuhravá (2006a), Skuhravá & Skuhravý (1977a, 1992a, 1997b, 1999a, 2002a, 2008a, 2011a. 2021a: 179), Skuhravá, Skuhravý, Dauphin & Coutin (2005a), Skuhravá, Skuhravý, Dončev & Dimitrova (1991a, 1992a), Skuhravá, Skuhravý & Ebejer (2002a), Skuhravá, Skuhravý & Meyer (2014a), Skuhravá, Skuhravý, Skrzypczyńska & Szadziewski (2008a), Skuhravý (1975a), Waitzbauer, Pruscha & Picher (1972a).