Morphological disparity in elateriform beetles: patterns, trends and implications.

Area of Science:

• Evolutionary Biology
• Morphometrics
• Macroevolutionary Studies

Background:

• Morphological disparity, the variation in phenotypic traits within evolutionary clades, provides insights into evolutionary dynamics beyond species diversity.
• Elateriformia, a hyperdiverse beetle clade, presents an ideal system for studying macroevolutionary drivers of disparity and analytical challenges.

Purpose of the Study:

• To investigate disparity patterns within the Elateriformia beetle clade.
• To explore macroevolutionary drivers of morphological disparity.
• To address methodological challenges in disparity analysis.

Main Methods:

• Utilized a large discrete morphological character dataset for Elateriformia.
• Employed principal coordinates analysis to visualize morphospace occupation.
• Compared disparity reconstructions using extant-only data versus data incorporating fossils.

Main Results:

• Distinct morphospace occupation patterns were observed among Elateriformia superfamilies.
• Elateroidea showed concentrated disparity linked to soft-bodiedness and paedomorphosis; Dryopoidea exhibited more even disparity.
• Fossil-inclusive analyses closely matched extant-only reconstructions for historical disparity.

Conclusions:

• Extant data is biologically significant for inferring historical disparity.
• Anatomical region choice significantly influences observed disparity patterns.
• Integrative anatomical sampling is essential for accurate macroevolutionary dynamic reconstructions.