Cyclorhipidion distinguendum (Eggers)

Barnouin, Thomas, Soldati, Fabien, Roques, Alain, Faccoli, Massimo, Kirkendall, Lawrence R., Mouttet, Raphaëlle, Daubree, Jean-Baptiste & Noblecourt, Thierry, 2020, Bark beetlesand pinhole borers recently ornewly introduced toFrance (Coleoptera Curculionidae, Scolytinae and Platypodinae), Zootaxa 4877 (1), pp. 51-74 : 56-59

- Cyclorhipidion distinguendum (Eggers)

( Fig. 1C )

Distribution. C. distinguendum , native to Southeast Asia, was recently detected in two eastern states of the United States, South Carolina and Georgia ( Hoebeke et al. 2018). France is the first European country where this species is reported. Detected for the first time in 2013 in the Dauphiné Pre-Alps ( Dodelin 2018), the species is currently known from five municipalities in two French departments. It was captured in moist alder mixed forest at low altitude and in beech-fir forests growing at low altitude. Thus, C. distinguendum is established in France but the point-of-entry remains unknown. It occupies a small geographical area stretching from the Chartreuse massif to south and from the Épine and the Chambotte mountains to the north. Its overall distributional range in France is unclear, however.

Literature records: SAVOIE – Brison-Saint-Innocent, interception trap, from 02.V. to 12.VII.2018, 4 ind. ( Dodelin 2018); La-Motte-Servolex, interception trap, 28.VI.2013, 2 ind. ( Dodelin 2018); Saint-Jean-de-Chevelu, interception trap, from 01.VIII. to 06.IX.2017, 4 ind. ( Dodelin 2018).

New records: ISERE – Pommier-la-Placette, unbaited interception trap, from 20.V. to 20.VI.2014, 1 ind., Janssen / Irstéa leg.; St-Pierre-de-Chartreuse, unbaited interception trap, 23.VI.2014, 1 ind. Janssen / INRAE leg .

Biology and ecology. Little information is available on the biology and ecology of this ambrosia beetle. Like many species belonging to this genus, C. distinguendum seem to be an oligophagous species with feeding preference for woody species of Fagaceae ( Hoebeke et al. 2018) .

Damage and infestation risk. To date, no phytosanitary problem related to this species has been observed in France or in the United States ( Hoebeke et al. 2018). However, like all Xyleborini , this insect carries symbiotic fungi some of which could be plant pathogens.

Figures

FIGURE 1. Amasa sp. near truncata (Erichson) (2.5 mm). A. dorsal view; B. lateral view. Cyclorhipidion distinguendum (Eggers) (2.9 mm). C. dorsal view. Dryocoetes himalayensis Strohmeyer (2.7 mm). D. dorsal view; E. lateral view. Length of specimens in brackets. (Photos: Olivier Denux, Fabien Soldati & Thomas Barnouin).