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PUBLIC RELEASE DATE:
17-Dec-2013

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Contact: Richard Levine
rlevine@entsoc.org
301-731-4535
Entomological Society of America
@EntsocAmerica

Meet the beetles -- the Xyleborini of New Guinea

An incestuous, fungus-farming beetle tribe is the subject of a new book from the Entomological Society of America

IMAGE: Xyleborini is a morphologically diverse tribe from New Guinea. Clockwise, starting from top left: Immanus acanthurus, Webbia pabo, Eccoptopterus spinosus (montane form), Cryptoxyleborus subnaevus, Coptodryas bella, and Amasa schlichi....

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Xyleborini is one of the most diverse and abundant groups of scolytine beetles worldwide, and they are also becoming very important invasive insect pests around the globe. In the U.S., the redbay beetle is threatening the existence of the avocado industry in Florida, and Asian ambrosia beetles are replacing native fauna throughout the southeastern U.S. and are attacking trees in nurseries. However, despite their economic importance, very few comprehensive monographic works deal with xyleborine beetles.

Now a new book published by the Entomological Society of America, Xyleborini of New Guinea, a Taxonomic Monograph (Coleoptera: Curculionidae: Scolytinae), integrates the most comprehensive classification of Xyleborini with recent works to produce the first phylogenetic, fully character-based system. Authors Jiri Hulcr (University of Florida) and Anthony I. Cognato (Michigan State University) obtained representatives of almost all species known from Papua New Guinea and used DNA sequencing to test the generic classification of the group and, in some instances, species boundaries.

"This is probably the most invasive group of beetles in the world," said Dr. Hulcr. "Xyleborinus saxesenii is as common in your backyard as it is in New Caledonia or Japan -- and on top of that, many of them look like fuzzy teddy bears with big heads, big eyes, and pom-poms instead of antennae."

IMAGE: This is a Hadrodemius globus female and male -- the large, diploid female and the little haploid male (her brother) that will mate with her.

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Besides their strange appearances, two other things set them apart from others. All of the species in the Xyleborini tribe are fungus farmers, and they are haplo-diploid inbreeders.

"Xyleborini have one of the most fascinating and most prolific reproductive strategies in the animal kingdom," said Dr. Hulcr. "A female lays many female eggs and a single male egg. Then the male fertilizes all of his sisters, which go on to establish their own families. Thus, a single female has the ability to establish a whole new population on a newly colonized continent."

In addition to the book (ISBN: 978-0-9776209-7-5), two online resources are available as supplemental materials: (1) a comprehensive set of photographs of all available New Guinean Xyleborini species, and (2) a set of multiple-entry electronic keys for all genera and all recognized species (available at http://www.ambrosiasymbiosis.org/PNG_Xyleborini).

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For more information, and to purchase the book, visit http://www.entsoc.org/pubs/xyleborini-new-guinea-taxonomic-monograph

The Entomological Society of America is the largest organization in the world serving the professional and scientific needs of entomologists and people in related disciplines. Founded in 1889, ESA today has more than 6,500 members affiliated with educational institutions, health agencies, private industry, and government. Members are researchers, teachers, extension service personnel, administrators, marketing representatives, research technicians, consultants, students, and hobbyists. For more information, visit http://www.entsoc.org.



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