A leafcutter bee trace fossil from the Middle Eocene of Patagonia, Argentina, and a review of megachilid (Hymenoptera) ichnology

被引：24
|
作者：
Sarzetti, Laura C. [1 ]
Labandeira, Conrad C. [2 ,3 ]
Genise, Jorge F. [1 ]
机构：
[1] Consejo Nacl Invest Cient & Tecn, Museo Paleontol Egidio Feruglio, RA-9100 Trelew, Chubut, Argentina
[2] Smithsonian Inst, Natl Museum Nat Hist, Dept Paleobiol, Washington, DC 20013 USA
[3] Univ Maryland, Dept Entomol, College Pk, MD 20742 USA
来源：
PALAEONTOLOGY | 2008年 / 51卷
关键词：
trace fossil; leafcutter bee; plant-insect associations; Rio Pichileufu flora; Patagonia; Argentina;
D O I：
10.1111/j.1475-4983.2008.00787.x
中图分类号：
Q91 [古生物学];
学科分类号：
0709 ; 070903 ;
摘要：
The ichnospecies Phagophytichnus pseudocircus isp. nov. is described to include trace fossils characterized by leaf-margin excisions showing eccentricity values of 0.35-0.65 and more than 270 degrees of an arc, a non cuspate margin and vein stringers or necrotic flaps of tissue along the margin. A method for determining ellipse eccentricity was performed on leaf discs obtained from the nests of the modern leafcutter bee Megachile rotundata (Hymenoptera: Megachilidae), which provided objectively obtained values comparable to the trace fossil from the middle Eocene of Argentina and other world-wide ichnological records, historically and subjectively considered to be 'circular' trace fossils and attributed to leafcutter bees. The material described herein represents the first evidence for fossil Megachilidae from the Southern Hemisphere.
引用
收藏
页码：933 / 941
页数：9
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