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Adaptations for gas exchange enabled the elongation of lepidopteran proboscises

Journal Article · · Current Biology
 [1];  [2];  [3];  [4];  [4];  [4];  [1];  [4]
  1. Southern University of Science and Technology (SUSTech), Shenzhen (China); Kent State Univ., Kent, OH (United States)
  2. Kent State Univ., Kent, OH (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Kent State University at Stark, North Canton, OH (United States)
The extensive biodiversification of butterflies and moths (Lepidoptera) is partly attributed to their unique mouthparts (proboscis [Pr]) that can span in length from less than 1 mm to over 280mm in Darwin's sphinx moths. Lepi-doptera, similar to other insects, are believed to inhale and exhale respiratory gases only through valve-like spi-racles on their thorax and abdomen, making gas exchange through the narrow tracheae (Tr) challenging for the elongated Pr. How Lepidoptera overcome distance effects for gas transport to the Pr is an open question that is important to understanding how the Pr elongated over evolutionary time. Here, we show with scanning electron microscopy and X-ray imaging that distance effects on gas exchange are overcome by previously unreported micropores on the Pr surface and by superhydrophobic Tr that prevent water loss and entry. We find that the density of micropores decreases monotonically along the Pr length with the maxima proportional to the Pr length and that micropore diameters produce a Knudsen number at the boundary between the slip and transition flow regimes. By numerical estimation, we further show that the respiratory gas exchange for the Pr predominantly occurs via diffusion through the micropores. In conclusion, these adaptations are key innovations vital to Pr elongation, which likely facilitated lepidopteran biodiversification and the radiation of angiosperms by coevolutionary processes.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2404972
Journal Information:
Current Biology, Journal Name: Current Biology Journal Issue: 14 Vol. 33; ISSN 0960-9822
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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