Eutomostethus punctatus (Konow, 1887)

Macek, Jan, 2014, Descriptions of larvae of the Central European Eutomostethus species (Hymenoptera: Symphyta: Tenthredinidae), Acta Entomologica Musei Nationalis Pragae 54 (2), pp. 685-692 : 690

Eutomostethus punctatus (Konow, 1887)

( Figs 3 , 7 )

Material examined. CZECH REPUBLIC: BOHEMIA CENTR.: KĜivoklátsko PLA, Prameny Klíþavy NR (5848), 14.viii.2011, larvae on Carex brizoides ; J. Macek lgt. & det. ( NMPC) .

Description of the last instar larva. Body length 12–13 mm. Head amber yellow, head surface granulose, in upper half with scattered tiny setae, and a row of longer setae alongside epistomal suture; clypeus with six setae, labrum symmetrical, deeply emarginated with eight setae, mandibles with one seta, palpifer with three setae, maxillar palpus with one seta, stipes with one seta; upper parts of body grey-yellowish, lower parts whitish, dark nebulous dorsal longitudinal stripes and lower white margined supraspiracular stripes; cuticle granulose; prothoracic suprapleural lobe protuberant, ¿rst prothoracic annulet with two glandubae; third abdominal segment with six annulets; second and fourth annulets with scattered tiny cylindrical setae; fourth annulet with two or four glandubae, ¿rst and second postspiracular lobe with one glanduba each, subspiracular and suprapedal lobes with one glanduba and numerous tiny blackish cylindrical setae; fourth annulet of the ninth abdominal segment with six glandubae, anal segment with two prominent glandubae in middle, suranal lobe with four glandubae; suranal and subanal lobes densely pubescent.

Notes on identification. Eutomostethus punctatus differs from the similar species E. gagathinus and E. luteiventris in the surface sculpture of the anal segment (see Fig. 3a ).

Bionomics. Habitat: mesophile and humid deciduous and coniferous forests, alder carrs with stands of sedges; univoltine; flight period May to June, occasionally July to August, larval period July to September; host plants: Carex sp. ( VERZHUTSKI 1981), C. paniculata ( LISTON 1995) , C. brizoides (new record). Mature larvae build for hibernation a fragile parchment cocoon covered with soil particles, in which they also pupate.

Discussion. VERZHUTSKI (1981) and LISTON (1995) mention food plants but without details about the source of these statements. I swept several females on C. brizoides in the bog spruce forest of Prameny Klíþavy National Reserve, KĜivoklátsko Protected Landscape Area in Central Bohemia, Czech Republic in June. On the second visit in August I swept in the same place the larvae feeding on C. brizoides .

Figures

Figs 1–4. Mounted larvae from alcohol. 1 – Eutomostethus ephippium (Panzer, 1798); 2 – E. luteiventris (Klug, 1816); 3 – E. punctatus (Konow, 1887); 4 – E. gagathinus (Klug, 1816). Lettering: a – the cuticular sculpture of the anal segement; b – the prothorax, the arrow indicating the protuberant suprapedal lobe. Scale bar: 2 mm.

Figs 5–8. Living last instar larvae (a – lateral view; b – dorsal view). 5 – Eutomostethus gagathinus (Klug, 1816); 6 – E. ephippium (Panzer, 1798); 7 – E. punctatus (Konow, 1887); 8 – E. luteiventris (Klug, 1816). Scale bar: 5 mm.