Pristiphora bifida ( Hellen , 1948), Hellen, 1948

Prous, Marko, Vikberg, Veli, Liston, Andrew & Kramp, Katja, 2016, North-Western Palaearctic species of the Pristiphoraruficornis group (Hymenoptera, Tenthredinidae), Journal of Hymenoptera Research 51, pp. 1-54: 22

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Pristiphora bifida ( Hellen , 1948)


Taxon classification Animalia Hymenoptera Tenthredinidae

Pristiphora bifida ( Hellen, 1948)  

Nematus (Pristiphora) bifidus   Hellén, 1948: 116-117. Lectotype ♀ (; here designated) in MZH, examined. Type locality: Malla, Kilpisjärvi, Enontekiö, Finland.

Similar species.

Externally, perhaps the most similar species is Pristiphora frigida   , from which it can be distinguished by having pale hind trochanters, trochantelli, and tibiae (black or brown in Pristiphora frigida   ). In addition, antennae of males have numerous and clearly visible stout black setae among finer paler ones (Fig. 36), while in Pristiphora frigida   there are only a few barely visible ones (Fig. 35). The lancets (Figs 70-71) and penis valves (87-88) are also different. Apical serrulae are somewhat shorter and more protruding and the tangium of the lancet tends to be longer and narrower (Fig. 70) than in Pristiphora frigida   (Fig. 71). The penis valve lacks (Fig. 87) a membranous fold near the tip of the ventro-apical spine (present in Pristiphora frigida   ; Fig. 88) and the pseudoceps has a distinct dorsal depression in the middle or basal part (absent in Pristiphora frigida   ).

Genetic data.

Based on COI barcode sequences, Pristiphora bifida   belongs to the same BIN cluster (BOLD:AAG3568) as Pristiphora aphantoneura   , Pristiphora confusa   , Pristiphora luteipes   , Pristiphora opaca   , Pristiphora pusilla   , Pristiphora staudingeri   , and Pristiphora subopaca   (Fig. 1). The nearest neighbour (BOLD:AAQ2302, Pristiphora armata   and Pristiphora leucopus   ) is 2.76% different. Only one partial TPI sequence (sequencing of the first exon and part of the following intron failed apparently because of intron length polymorphism) of Pristiphora bifida   is available, which can be distinguished from other species (Fig. 2).

Host plants.

Salix viminalis   L. ( Liston and Burger 2009). In Kilpisjärvi (Finland) some other species must be the host, as Salix viminalis   does not occur there.

Distribution and material examined.

Western Palaearctic. Specimens studied are from Finland, Germany, Norway, and Sweden. According to the BOLD database, this species may also be present in North America. The identifications of North American specimens falling within BIN cluster BOLD:AAG3568 are however uncertain.