Taxonomy of Ips calligraphus
In Canada a review of the taxonomy of the Ips calligraphus (EPPO A1 quarantine pest) group was carried out. According to the authors 4 taxa can be separated within the Calligraphus species group of the genus Ips according to karyological, morphological and ecological characteristics as well as breeding experiments and their distributions:
Ips calligraphus calligraphus occurs in the eastern USA and adjacent parts of Canada.
I. c. ponderosae occurs in the range of Pinus ponderosa in the Black Hills (South Dakota, US), eastern Rocky Mountains and in the northern Sierra Madre Oriental in Mexico.
I. c. interstitialis occurs in the Caribbean Archipelago but the homogeneity of populations on the islands of Hispaniola (Haiti and Dominican Republic) and Jamaica and the true type locality are uncertain.
Ips apache sp. nov. infests various pines at lower altitudes from southeastern Arizona (US) through Mexico. Populations south of the Isthmus of Tehuantepec in Caribbean pines (Pinus caribaea) on the east coast of Central America are provisionaly considered by the authors to be I. apache.
Lanier, G.N.; Teale, S.A.; Pajares, J.A. (1991) Biosystematics of the genus Ips in North America: review of the Ips calligraphus group.
Canadian Entomologist 123, 1103-1124.