NDLI: Origin of a complex key innovation in an obligateinsect

Content Provider	PubMed Central
Author	Olle, Pellmyr Krenn, Harald W.
Copyright Year	2002
Abstract	Evolutionary key innovations give organisms access to newecological resources and cause rapid, sometimes spectacular adaptiveradiation. The well known obligate pollination mutualism betweenyuccas and yucca moths is a major model system for studies ofcoevolution, and it relies on the key innovation in the moths ofcomplex tentacles used for pollen collecting and active pollination.These structures lack apparent homology in other insects, making them arare example of a novel limb. We performed anatomical and behavioralstudies to determine their origin and found evidence of a remarkablysimple mechanism. Morphological analyses of the tentacles and adjacentmouthparts in pollinators and closely related taxa showed that thetentacle appears abruptly in female pollinating yucca moths. Severalmorphological synapomorphies between the galeae, which constitute thecharacteristic lepidopteran proboscis, and the tentacle suggest thatthe tentacle evolved quickly through expression of the genetic templatefor the galea at an apical growth bud on the first segment of themaxillary palp. Behavioral data indicate that tentacle and proboscismovements are controlled by a shared hydraulic extension mechanism,thus no new mechanism was needed for tentacle function. Knowndevelopmental paths from other insects can explain the origin of thissex-specific key innovation in a few steps.
Related Links	http://dx.doi.org/10.1073/pnas.072588699
Ending Page	5502
Page Count	5
Starting Page	5498
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	8
Volume Number	99
Language	English
Publisher	National Academy of Sciences
Publisher Date	2002-04-16
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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