Strongylogaster multifasciata (Geoffroy, 1785)

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 : 259-260

Strongylogaster multifasciata (Geoffroy, 1785)

( Figs. 6 , 9 )

Material examined. CZECH REPUBLIC: BOHEMIA or.: Železné hory PLA: Hubský pond (6160), 6.vi.2000, 1 spec. ; Mokřadlo NR (6260), 6.vi.2000, 1 spec., all F. Bárta lgt. ( MT). Orlické hory PLA: Pod Sfingou rock (5764), 21.v.2003, 1 spec., J. Hájek lgt. BOHEMIA bor.: Bělá u Děčína (5251), 14.vi.1957, 5 spec., Z. Bouček lgt. České Švýcarsko NP:Limberk hill (5052), 25.v.2007, 2 spec. ; Křinice stream (5052), 2.vi.2008, 1 spec. ; Růžák NR (5152), 25.vi.2007, 1 spec. ; Mlýny hill (5152), 16.v.2007, 1 spec., 6.vi.2007, 1 spec. ; Zadní Jetřichovice (5052), 29.vi.2004, 1 spec., 6.vi.2007, 2 spec. ; Ponova louka NR (5151), 20.vi.2006, 1 spec. ; Bílý potok brook (5052), 15.vi.2006, 1 spec. ; Vlčí potok brook (5052), 23.v.2006, 3 spec., 17.vii.2006, 1 spec. ; Suchá Bělá brook (5151), 15.vi.2005, 1 spec. ; Brtnický potok brook (5052), 29.vi.2004, 1 spec., all M. Trýzna lgt ( MT) ; Brtnický potok brook (5052), 29.viii.2005, larva on Pteridium aquilinum , 1 spec., J. Macek lgt. BOHEMIA centr.: Brdy Mts.: Tok Mt. (6249), 862 m a.s.l., 5 spec., J. Macek lgt. Český kras PLA: Kačák brook (6050), 31.v.2007, 1 spec., J. Macek lgt .; Dobříš (6250), 10.vi.1959, 1 spec., Z. Pádr lgt. ALBANIA: Mali Dajtí, 1408 m a.s.l., 28.v.1959, J. Moucha lgt. BULGARIA: Petric, 29.vi.[no year], 1 spec., Mařan & Táborský lgt .; all J. Macek det. ( NMPC).

Adult. Notes on identification. The adults differ from the similar S. xanthocera by a deep median incision of the last sternum, black antennae and tricoloured (black, orange and white) hind femora in females and orange-yellow (except the first two tergites) abdomen in males ( Fig. 6 ).

Larva. Redescription. The larva was first described by LORENZ & KRAUS (1957) and WELKE (1959) under the name S. lineata (Christ, 1791) . Green with dark transparent dorsal vessel; head in younger instars orange yellow, in last instar with two dark parietal spots; abdominal segments with seven annulets; annulets 2 and 4 with two small conical tubercles and 6–8 setae; annulet 7 with only five setae; subspiracular lobe with one conical tubercle and 6–8 setae; surpedal lobe with two conical tubercles and 8–10 setae; postspiracular lobe with two conical tubercles and five setae ( Fig. 9 ).

Notes on identification. Last instar larva differs from that of S. xanthocera by the presence of two dark parietal spots on the head (compare to S. xanthocera below). Moreover, the larvae appear later (June to July).

Bionomics. Univoltine. Flight period from late May to early July; larval period from June to July. Host plants: Dryopteris (= Aspidium ), Polystichum (Dryopteridaceae) , Matteuccia struthiopteris (Woodsiaceae) and Pteridium aquilinum (= Eupteris aquilina ) ( Dennstaedtiaceae ) ( TAEGER et al. 1998). I collected the larvae exclusively on P. aquilinum .

Distribution. Palaearctic Region (Europe, Siberia, China, Japan, Korea) ( NAITO 1996). Scattered occurrence in the Czech Republic from uplands to highlands.

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.