Hoplocampa ariae Benson, 1933

Liston, Andrew, Prous, Marko & Vårdal, Hege, 2019, A review of West Palaearctic Hoplocampa species, focussing on Sweden (Hymenoptera, Tenthredinidae), Zootaxa 4615 (1), pp. 1-45 : 12

Hoplocampa ariae Benson, 1933

Hoplocampa (Hoplocampa) ariae Benson, 1933: 255–256 . Holotype ♀, not examined, in BMNH. Type locality: England, Sur- rey, Box Hill.

Additional description. Body length: 4.5–6.5mm. Clypeus narrowly and deeply emarginate. Pale colour creamywhite to testaceous. Female: the following may be more or less fuscous, or black: antenna above, sunken parts of meso- and metapostnotum, tarsi, apex of metatibia, apex of valvula 3. Lancet: Fig. 78 . Male: the following may be more or less fuscous, or black: anterior of median mesoscutal lobe, meso- and metapostnotum, tarsi, apex of metatibia, basal and apical margins of abdominal terga 1–3, sometimes also a spot in middle of these terga, and a small lateral spot each side. Penis valve: Fig. 96 .

Total number of specimens examined: 10.

Similar species. Most similar are Hoplocampa alpina and phantoma (see key, and under alpina ). Very pale specimens of crataegi , from southern Europe, are also similar, but in crataegi the radius is darker than the other venation, whereas in ariae and alpina all venation is equally pale. The lancet of ariae ( Fig. 78 ) is closely similar to that of alpina ( Fig. 77 ) and crataegi ( Fig. 79 ), but the ventralmost ctenidial tooth on the middle annuli is situated more dorsally in ariae than in alpina . The most reliable difference between the lancets of ariae and phantoma is the presence of ctenidial teeth on annular sutures ca. 1–3 in the former, and on ca. 1–7 in the latter. The penis valves of ariae ( Fig. 96 ) and phantoma ( Figs 98–99 ) are clearly different in overall shape, and ariae has a group of long setae on the apex of the valviceps, which are absent in phantoma . The penis valves of ariae and alpina ( Fig. 94 ) are also similar, but ariae has a more obtuse valviceps apex and larger group of apical setae, which are also longer.

Life history. Host plant: Sorbus aria ( Pschorn-Walcher & Altenhofer 2000) .

Distribution. Central Europe, England and Ireland ( Taeger et al. 2006). Occurrence in Sweden: no records, but might occur on naturalised Sorbus aria , or potentially on the related, native S. intermedia , S. rupicola , or S. norvegica .

Specimens examined. Germany: Bavaria: 1♀ (DEI-GISHym19230), Trimbach, Trimburg , 14.05.2004, leg. Liston ( SDEI) . 3♀ (including DEI-GISHym19229, 83551), NW Regensburg, Deuerling , 24.05.2004, leg. Lis- ton ( SDEI) . Italy: 1♀ 3♂ (BC-ZSM-HYM06414–06415, 07203–07204), 26 km SW Cuneo, Lago della Rovina , 17.06.2009 ( ZSM) . United Kingdom: 1♀ 1♂ (DEI-GISHym83574), England, Buckinghamshire, Aston Clinton , 06.06.1953, leg. R. B. Benson ( SDEI) .

Figures

FIGURES 77–82. Lancets: 77, alpina (DEI-GISHym83575), spurette arrowed. 78, ariae (DEI-GISHym83551). 79, crataegi (DEIGISHym83583). 80, phantoma (DEI-GISHym83552). 81, brevis (DEI-GISHym83557). 82, chamaemespili (DEI- GISHym11128).

FIGURES 94–107. Penis valves: 94 alpina (DEIGISHym20575). 95, crataegi (DEI-GISHym31784). 96, ariae (DEI- GISHym83574). 97, chamaemespili (BC-ZSM-HYM11307). 98–99, phantoma (DEI-GISHym83553): dorsal lobe intact, dorsal lobe destroyed during preparation. 100, flava (DEI-GISHym20595). 101, chrysorrhoea (DEI-GISHym83548). 102, fulvicornis (DEI-GISHym83782). 103, minuta (DEI-GISHym31782). 104, tadshikistanica [after Muche (1986), fig. 1]. 105, pectoralis (DEI-GISHym80337). 106, testudinea (DEI-GISHym83547). 107, plagiata (DEI-GISHym83556).