{
  "id": 18493160,
  "title": "Geometric Morphometrics of Pistillate Flowers in Astrocaryum sect. Huicungo (Arecaceae): Taxonomic Implications for the Peruvian Species",
  "url": "https://urgent.news/2026/11/06/geometric-morphometrics-of-pistillate-flowers-in-astrocaryum-sect",
  "topic": "science",
  "section": "Science",
  "published": "2026-11-06T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.11.04.764277v1?rss=1"
  },
  "original_language": "en",
  "account": "The classification of Amazonian palm group Astrocaryum sect. Huicungo has been a source of debate due to conflicting traditional classifications based on qualitative floral characteristics and recent phylogenomic findings. To resolve this issue, researchers employed landmark-based two-dimensional geometric morphometrics, analyzing the symmetric shape variation in calyx and corolla structures of 549 pistillate flowers from the 11 Peruvian species. While multivariate analyses, including PCA and CVA, demonstrated continuous morphological variation and considerable phenotypic overlap, they also found that perianth geometry maintained a significant diagnostic signal. When cross-validated, the corolla structure proved more effective for species differentiation than the calyx. Moreover, the combined analysis of calyx and corolla perianth components yielded the highest taxonomic assignment accuracy. Notably, the Mahalanobis distance-based clustering method failed to replicate the traditional subsections; instead, A. chonta and A. ulei were revealed to possess distinct architectures, while A. carnosum, A. faranae, and A. huicungo demonstrated profound geometric similarities. These findings underscore the potential of quantitative perianth morphometrics as an effective tool for refining species delineation within Astrocaryum, suggesting that a more integrative approach is needed to revise traditional taxonomic boundaries.",
  "summary": "The taxonomy of the Amazonian palm clade Astrocaryum sect. Huicungo remains controversial due to deep discordances between traditional classifications based on qualitative floral traits and recent phylogenomic evidence. To address this, landmark-based two-dimensional geometric morphometrics (4 landmarks, 16 semilandmarks) was applied to evaluate the symmetric component of shape variation in calyx…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}