Overview
- A peer‑reviewed study published Thursday, September 10, 2026 used high‑resolution micro‑CT/XCT scans of the Field Museum holotype of Pseudocerastes urarachnoides to image the tail without damaging the specimen.
- The scans found the spider‑like appendage is produced by elongated, fused keratinous scales and surrounding soft tissue rather than by any unusual vertebrae or bony modification.
- Researchers describe the underlying tail vertebrae as ‘‘bizarrely normal,’’ meaning the dramatic external lure would not be apparent from bones alone.
- The non‑destructive imaging underscores the scientific value of museum collections and shows how reliance on skeletons can mislead paleontologists about an animal’s true appearance and behavior.
- Authors say the species remains poorly known in the field and recommend genetic surveys and ecological studies to assess population size, connectivity across western Iran’s mountaintops, and conservation needs.