Strongylogaster mixta (Klug, 1817)

Macek, Jan, 2010, Taxonomy, distribution and biology of selected European Dinax, Strongylogaster and Taxonus species (Hymenoptera: Symphyta), Acta Entomologica Musei Nationalis Pragae 50 (1), pp. 253-271 : 256-257

Strongylogaster mixta (Klug, 1817)

( Figs. 4 , 12 )

Material examined. CZECH REPUBLIC: BOHEMIA mer.: Křivoklátsko PLA: Nižbor (5950), 1.v.2006, 2 spec., J. Macek lgt. BOHEMIA or.: Orlické hory PLA: Bukačka NR (5664), 24.v.1994, 2 spec. ; Zvonkové údolí valley (5865), 20.v.2003, 1 spec., all J. Macek lgt. ( MT) ; Trčkov NR (5664), 16.–25.v.1994, 2 spec., J. Hájek & J. Ježek lgt., 25.vi.2003, 1 spec., J. Hájek lgt.; Železné hory PLA: Krkanka NR (6160), 2.vi.2004, 3 spec. ; Lichnice (6159), 25.iv.–25.v.1999, 3 spec., 12.v.2000, 1 spec., 18.vi.2000, 1 spec. ; Strádovka NR (6160), 1 spec. ; Polom NR (6160), 23.v.1996, 9 spec., 27.v.1997, 2 spec., 20.v.1998, 1 spec., all F. Bárta lgt. ( MT). BOHEMIA bor.: Jizerské hory PLA: Rybí loučky NR (5158), 17.v.–29.v.2003, 1 spec., P. Vonička lgt. ( MT) ; České Švýcarsko NP, Růžák NR (5152), 15.vi.2005, 1 spec., Trýzna lgt ( MT). BOHEMIA occ.: Sokolov distr.: Tatrovický potok brook (5742), 3.vi.2002, 3 spec., J. Ježek lgt.( MT) ; Lomnice (5741), 19.v.2005, 1 spec., J. Macek lgt. MORAVIA bor.: Beskydy PLA: Trojačka NR (6474), 6.v.1934, 1 spec., F. Gregor lgt .; Radhošť Mt. (6575), 8.v.1929, 1 spec., F. Gregor lgt .; Frenštát pod Radhoštěm (6475), 30.iv.1926, 2 spec., F. Gregor lgt .; all J. Macek det. ( NMPC).

Larva. Redescription. For the diagnosis of LORENZ & KRAUS (1957) based on FORSIUS (1920) is insufficient for correct identification, the short redescription of the last instar larva is given here. Head brownish yellow with the upper half black; body in dorsal part above the spiracles greenish grey, ventral part below the spiracles white grey, suranal lobe with two black spots ( Fig. 12 ). Annulets 2, 4 and 7 with very short fine setae and annulets 2 and 4 with two additional small conical tubercles. Prolegs with dense setation. Ground colour of the immature instars greenish with black head and no black spot on suranal lobe.

Notes on identification. The last instar larvae are easily distinguished from the other Selandrinae associated with ferns by the greenish grey ground colour of the dorsum and the black spot on the suranal lobe.

Bionomics. Univoltine. Flight period from the end of April to mid June; larval period from mid May to the end of June. Host plants: Athyrium filix-femina (Woodsiaceae) , Dryopteris (= Aspidium ) spp., Dryopteris dilatata (Dryopteridaceae) , Pteridium aquilinum (Dennstaedtiaceae) , Adianthum pedatum (Adianthaceae) ( LACOURT 1999) and Dryopteris filix-mas ( CHAPMAN 1920) . I collected the larvae exclusively on Athyrium filix-femina .

Distribution. Palaearctic Region (central and northern Europe, Siberia, and Japan) ( NAITO 1996). Distribution in central Europe: Austria, Czech Republic, Germany, Poland, Slovakia and Switzerland ( TAEGER & BLANK 2008). Widespread and common in the Czech Republic, mainly in uplands and mountains.

Figures

Figs. 2–7. Strongylogaster Dahlbom, 1835, adults: 2 – S. macula (Klug, 1817); 3 – S. baikalensis Naito, 1990; 4 – S. mixta (Klug, 1817); 5 – S. filicis (Klug, 1817); 6 – S. multifasciata (Geoffroy, 1785); 7 – S. xanthocera (Stephens, 1835). Scale: 10 mm.

Figs. 8–12. Strongylogaster Dahlbom, 1835, larvae: 8 – S. xanthocera (Stephens, 1835): a – immature instar (dorsal view); b – last instar (lateral view); c – last instar (laterodorsal view). 9 – S. multifasciata (Geoffroy, 1785): a – last instar (laterodorsal view); b – last instar (dorsal view). 10 – S. macula (Klug, 1817): last instar (laterodorsal view). 11 – S. baikalensis Naito, 1990: last instar (laterodorsal view). 12 – S. mixta (Klug, 1817): a – immature instar (laterodorsal view); b – last instar (lateral view); c – last instar (lateral view). Scale for last instar larva: 10 mm.