Pristiphora cadma Wong & Ross, 1960,

Prous, Marko, Kramp, Katja & Liston 1, Veli VikbergAndrew, 2017, North-Western Palaearctic species of Pristiphora (Hymenoptera, Tenthredinidae), Journal of Hymenoptera Research 59, pp. 1-190: 83

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Pristiphora cadma Wong & Ross, 1960


Pristiphora cadma Wong & Ross, 1960  Figs 51, 331-337

Pristiphora cadma  Wong & Ross, 1960: 198. Holotype ♀ was not found in CNC. Type locality: Meadow Lake, Saskatchewan, Canada.

Similar species.

Females of P. cadma  could most likely be confused with P. bufo  or P. conjugata  . Completely or nearly completely pale mesepisternum (Fig. 336) and sometimes extensively pale dorsal part of thorax (Fig. 51) distinguish cadma  from conjugata  . Claws with large subapical tooth (Fig. 335) can be used to distinguish cadma  from bufo  (which has a small subapical tooth, Fig. 22). Additionally, the serrulae of lancet of cadma  are more protruding than in bufo  and conjugata  . Penis valves of cadma  (Fig. 337) are most similar to P. nigricans  and P. pallidiventris  , but completely or nearly completely pale mesepisternum (Fig. 336) of cadma  distinguishes it from the two species (mesepisternum is at most partly pale in some P. pallidiventris  ). The head and dorsal part of thorax of two studied European females (Estonia and Sweden) are distinctly paler than three studied Canadian females (which fit the original description). However, it is quite likely that these characters vary continuously, as for example in P. bufo  and P. paralella  . Small differences in the lancet (Figs 331, 333) (shape of the basal sutures of the annuli and tip of the lancet) are probably not reliable either. According to the original description, the holotype female is 8 mm long, but the studied females from Canada (5.9-6.5 mm) are in the same size range as the European specimens (6.1-6.5 mm).

Genetic data.

Based on a single COI barcode sequence (TUZ615726), P. cadma  forms its own cluster (no BIN number has been assigned yet) (Fig. 5). Based on nuclear data (one specimen and both genes combined), the nearest neighbour is 1.0% different ( P. testacea  ).

Host plants.

Betula papyrifera  Marshall (based on label data of five reared specimens from Canada) and probably some other Betula  species ( B. papyrifera  occurs naturally only in northern North America).

Distribution and material examined.

West Palaearctic, Nearctic. Specimens studied are from Canada, Estonia and Sweden.