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Cryptic Species Discrimination in Western Pine Beetle, Dendroctonus brevicomis LeConte (Curculionidae: Scolytinae), Based on Morphological Characters and Geometric Morphometrics

1
Prolongación de Carpio y Plan de Ayala, Laboratorio de Variación Biológica y Evolución, Zoología, Depto, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Col. Santo Tomas, Del. Miguel Hidalgo, Ciudad de México CP 11340, Mexico
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Facultad de Ciencias Forestales, Universidad Autónoma de Nuevo León, Carretera Nacional No. 85, Km. 145, Linares, Nuevo León CP 67700, Mexico
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United States Department of Agriculture, Forest Service, Rocky Mountain Research Station, 240 West Prospect, Fort Collins, CO 80525, USA
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United States Department of Agriculture, Forest Service, Southern Research Station, 2500 Shreveport Hwy, Pineville, LA 71360, USA
*
Author to whom correspondence should be addressed.
Current address: Instituto de Biología, Universidad Nacional Autónoma de México, Cto. Zona Deportiva 53, Ciudad Universitaria, Coyoacán CP 04510, Mexico.
Insects 2019, 10(11), 377; https://doi.org/10.3390/insects10110377
Received: 30 August 2019 / Revised: 30 September 2019 / Accepted: 3 October 2019 / Published: 30 October 2019
The western pine beetle (WPB), Dendroctonus brevicomis LeConte, is a major mortality agent of pines in North America. A total of 706 adults of WPB from 81 geographical sites were analyzed with traditional and geometric morphometric methods to evaluate the variation of discrete and quantitative morphological characters with particular attention to the antenna, spermatheca, and seminal rod. Principal coordinates and canonical variate analyses supported three geographical groups in WPB: (1) West, from British Columbia to southern California along the Pacific coast, Idaho, and Montana; (2) East-SMOC, including Nevada, Utah, Colorado, Arizona, New Mexico, Texas, Chihuahua, and Durango; and (3) SMOR, including Coahuila, Nuevo Leon, and Tamaulipas. The pubescence length on the elytral declivity was a robust character for separating West specimens from the other groups. Additionally, the genitalia shape both female and male in dorsal view was a reliable character for discriminating among groups. Based on these results, which agree with genetic and chemical ecology evidence, we herein reinstate Dendroctonus barberi Hopkins (East-SMOC group) and remove it from synonymy with D. brevicomis (West group). Differences in the spermatheca and seminal rod shape of SMOR specimens suggest that these populations might be a different species from D. barberi and D. brevicomis. View Full-Text
Keywords: Dendroctonus frontalis complex; taxonomy species delimiting; morphometrics Dendroctonus frontalis complex; taxonomy species delimiting; morphometrics
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Valerio-Mendoza, O.; García-Román, J.; Becerril, M.; Armendáriz-Toledano, F.; Cuéllar-Rodríguez, G.; Negrón, J.F.; Sullivan, B.T.; Zúñiga, G. Cryptic Species Discrimination in Western Pine Beetle, Dendroctonus brevicomis LeConte (Curculionidae: Scolytinae), Based on Morphological Characters and Geometric Morphometrics. Insects 2019, 10, 377.

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