TitleA cretaceous palm bruchid, Mesopachymerus antiqua, N gen, N sp (Coleoptera : Bruchidae : Pachymerini) and biogeographical implications
Publication TypeJournal Article
Year of Publication2005
AuthorsPoinar, GO
JournalProceedings of the Entomological Society of Washington
Volume107
Pagination392-397
Type of ArticleJournal Article
ISSN0013-8797
Abstract

Mesopachymerus antiqua (Coleoptera: Bruchidae), a new genus and species of palm seed beetles, is described from Cretaceous Canadian amber. The new genus is characterized by its small size (under 3 mm in length with head deflexed), head prolonged into a short beak, coarse eye facets, non-existent ocular sinus, complete pronotal carina, pro- and metatarsi segment 1 well expanded at apices, metafemur incrassate, pecten with 6 denticles, prepectenal ridge with 8 spines and with the denticles and spines offset when the leg is flexed and metatibia positioned on the lateral side of the pecten and on the mesal side of the prepectenal spines. Based on this fossil, it is proposed that the Bruchidae arose in the Nearctic during the Jurassic or Early Cretaceous and then migrated to the Palearctic over the Beringia land bridge before the Oligocene. Movement into South America could have occurred at the end of the Cretaceous when the Proto-Greater Antilles formed a land bridge connecting North and South America. Palm seeds are suggested to be the ancestral hosts of the Bruchidae.

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