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Three-Dimensional Reconstruction of Cephalopod Beaks: A 3D Modeling Workflow Combining Prism-Assisted Photogrammetry

Lele Xu1,2, Yongqin Li1, Jiechun Chen1

  • 1Life Science and Technology School Lingnan Normal University Zhanjiang China.

Ecology and Evolution
|July 14, 2026
PubMed
Summary

Accurate 3D cephalopod beak models are now achievable using prism-assisted photogrammetry. This cost-effective method aids ecological studies like diet reconstruction and population analysis.

Keywords:
3D model3D reconstructioncephalopod beakmicro‐CT validationphotogrammetryprism reflection

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Area of Science:

  • Marine Biology
  • Computational Biology
  • Paleontology

Background:

  • Cephalopod beaks offer valuable ecological data but are difficult to reconstruct in 3D due to size and dehydration sensitivity.
  • Existing methods for 3D reconstruction are often time-consuming and technically demanding, limiting large-scale analyses.
  • Accurate 3D models are crucial for understanding cephalopod ecology, evolution, and population dynamics.

Purpose of the Study:

  • To develop and validate a novel, efficient workflow for accurate 3D reconstruction of cephalopod beaks.
  • To assess the precision and accuracy of the developed 3D modeling technique compared to micro-CT scans.
  • To demonstrate the utility of the 3D models for species discrimination and ecological applications.

Main Methods:

  • Integration of prism-assisted photogrammetry for rapid image acquisition (five views in <1 min).
  • Application of digital sculpting techniques for refining 3D models.
  • Validation using micro-computed tomography (micro-CT) for precise dimensional and angular measurements.
  • Hierarchical cluster analysis for species-level discrimination using beak morphology.

Main Results:

  • The workflow produced accurate 3D models of cephalopod beaks with minimal deviation (<2% linear, <3° angular) from micro-CT data.
  • High coefficients of variation (3.5%-5.7%) across morphological parameters indicate robust model consistency.
  • Nearly 100% species-level discrimination was achieved between *Sepia pharaonis* and *Sepioteuthis lessoniana*.
  • Digital models, 3D prints, and original specimens showed high convergence in fine-resolution details.

Conclusions:

  • The prism-assisted photogrammetry workflow provides a cost-effective, portable, and accurate solution for 3D cephalopod beak reconstruction.
  • This method overcomes previous technical limitations, facilitating large-scale ecological analyses.
  • Applications include population structure inference, diet reconstruction, and demographic modeling in cephalopod research.