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<p>Genus <i>Keratella</i> comprises 55 species of rotifers, 53 of which possess a dome-shaped, dorsal plate divided by slightly raised ridges into a network of polyhedral units (facets). Thus, most species resemble an elongate, truncated, geodome, with facets defining their facet pattern (FP). Traditionally, FP morphospace has been categorized into groups based on their archetypical model: <i>K. cochlearis</i> (cFP); <i>K. quadrata</i> (qFP); <i>K. serrulata</i> (sFP). A previous study posited that <i>Keratella</i> FP provide functional significance of resisting physical stress, e.g., that may be incurred when caught in the brachial chambers of Cladocera. Using finite elemental analysis as applied by the architectural program (SkyCiv©), they tested whether a geodome resembling <i>K. cochlearis</i> could meet architectural code, i.e., a proxy for structural stability. Here we extended that study by testing the ability of 20 <i>Keratella</i>-like geodomes to meet architectural code. Of these, 14 met code at all stress levels, three failed at level 3, two failed at 4, and one failed at all levels. We posit that the three FP groups represent adaptive peaks that can resist physical stress that reside within the fitness landscape of <i>Keratella</i> FP morphospace. Morphological FP variants and the two species without FPs represent locally adapted sub-optima.</p>

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Does facet pattern morphospace affect structural stability in Keratella Bory de St. Vincent (Rotifera, Monogononta, Brachionidae)?

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Rachel Travis,
  • Eric Bailey,
  • Elizabeth J. Walsh,
  • Thiago Q. Araújo,
  • Rick Hochberg,
  • Robert L. Wallace

摘要

Genus Keratella comprises 55 species of rotifers, 53 of which possess a dome-shaped, dorsal plate divided by slightly raised ridges into a network of polyhedral units (facets). Thus, most species resemble an elongate, truncated, geodome, with facets defining their facet pattern (FP). Traditionally, FP morphospace has been categorized into groups based on their archetypical model: K. cochlearis (cFP); K. quadrata (qFP); K. serrulata (sFP). A previous study posited that Keratella FP provide functional significance of resisting physical stress, e.g., that may be incurred when caught in the brachial chambers of Cladocera. Using finite elemental analysis as applied by the architectural program (SkyCiv©), they tested whether a geodome resembling K. cochlearis could meet architectural code, i.e., a proxy for structural stability. Here we extended that study by testing the ability of 20 Keratella-like geodomes to meet architectural code. Of these, 14 met code at all stress levels, three failed at level 3, two failed at 4, and one failed at all levels. We posit that the three FP groups represent adaptive peaks that can resist physical stress that reside within the fitness landscape of Keratella FP morphospace. Morphological FP variants and the two species without FPs represent locally adapted sub-optima.