Canadian Forest Service Publications

Sexual dimorphism in the mandible shape of Neospondylis upiformis (Coleoptera: Cerambycidae). 2018. Hébert, C.; Dubuc, Y. Advances in Entomology 6: 226-234.

Year: 2018

Available from: Laurentian Forestry Centre

Catalog ID: 39280

Language: English

CFS Availability: PDF (request by e-mail)

Available from the Journal's Web site.
DOI: 10.4236/ae.2018.64018

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Sexes of adult Cerambycidae (Coleoptera) are usually discriminated by the greater length of male antennae. However, in Spondylidinae, adult antennae are short and the difference between sexes is negligible and difficult to appraise. Only two species belong to this subfamily in North America, one of these being Neospondylis upiformis (Mannerheim), a species rarely caught in eastern North America. Unexpectedly, we collected numerous specimens of Neospondylis upiformis on Anticosti Island, Quebec, which appears as a hotspot for this species in eastern Canada. We show that sexual dimorphism in the mandible shape of N. upiformis (Mannerheim) can be used to discriminate sexes. Females have robust mandibles with a sharp cutting inner edge while males have thin mandibles and a well-rounded inner edge. There was no overlap between sexes in all measures done on mandibles, showing that mandible shape was a reliable criterion for sexing N. upiformis. We also tested previously reported criteria using antennae, as well as other characteristics such as body size, and show that they can hardly discriminate between sexes in N. upiformis. We also present illustrations of male and female genitalia, which is rarely available for Cerambycidae.

Plain Language Summary

In this study, the researchers showed that the shape of the mandible (mouth piece) of Neospondylis upiformis (Mannerheim) could be used to differentiate between the two sexes. They also studied other criteria, such as antennas and body size, which are not effective factors by which to differentiate between the sexes of this species.

The authors also present illustrations of the genitalia of both sexes.

This insect is a longhorned beetle rarely observed in eastern North America.

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