Journal
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 286, Issue 1895, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspb.2018.2352
Keywords
parasitoid; Brownian motion; morphological evolution; evolution rates; Ichneumonidae; geometric morphometrics
Categories
Funding
- National Science Foundation [1501802]
- Society of Systematic Biologists
- AMNH
- Academy of Natural Sciences of Drexel University
- UC Berkeley
- U.S. National Science Foundation [DEB-1555905]
- Richard Gilder Graduate School (AMNH)
- Peter Buck Postdoctoral Fellowship (Smithsonian Institution)
- Sackler Institute of Comparative Genomics (SICG) at the AMNH
- Labex BCDiv (Museum National d'Histoire Naturelle)
- Division Of Environmental Biology
- Direct For Biological Sciences [1501802] Funding Source: National Science Foundation
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Understanding phenotypic diversification and the conditions that spur morphological novelty or constraint is a major theme in evolutionary biology. Unequal morphological diversity between sister clades can result from either differences in the rate of morphological change or in the ability of clades to explore novel phenotype ranges. We combine an existing phylogenetic framework with new phylogenomic data and geometric morphometrics to explore the relative roles of rate versus mode of morphological evolution for a hyperdiverse group: cryptine ichneumonid wasps. Data from genomic ultraconserved elements confirm that cryptines are divided into two large clades: one specialized in the use of hosts that are deeply concealed under hard substrates, and another with a much more diversified host range. Using a phylomorphospace approach, we show that both clades have experienced similar rates of morphological evolution. Nonetheless, the more specialized group is much more restricted in morphospace occupation, indicating that it repeatedly evolved morphological change through the same morphospace regions. This is in agreement with our prediction that host use imposes constraints in the morphospace available to lineages, and reinforces an important distinction between evolutionary stasis as opposed to a scenario of continual morphological change restricted to a certain range of morphotypes.
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