Revisiting the scorpion central nervous system using microCT.

Area of Science:

• Zoology
• Neuroscience
• Evolutionary Biology

Background:

• The central nervous system (CNS) of Chelicerata is ancient and largely conserved.
• Limited research exists on the morphological variability of the scorpion CNS within different taxonomic groups.
• Understanding scorpion CNS structure is crucial for comparative studies in arachnids.

Purpose of the Study:

• To visualize and analyze the scorpion CNS using microCT technology.
• To investigate morphological variations within the scorpion CNS across different species and families.
• To establish a comprehensive understanding of scorpion CNS anatomy and its evolutionary implications.

Main Methods:

• Micro-computed tomography (microCT) scanning of six scorpion species.
• Detailed 3D rendering and morphological analysis of the prosomal ganglion and opisthosomal ventral nerve cord.
• Comparative analysis of scorpion CNS structures with existing literature and other arachnid taxa.

Main Results:

• High-resolution 3D rendering of the scorpion prosomal ganglion was achieved, particularly in Paruroctonus becki.
• The scorpion CNS, including major nerves and the first opisthosomal ganglion, demonstrated significant conservation across examined taxa.
• Observed variations included differences in prosomal ganglion shape and the positional variability of the first opisthosomal ganglion.

Conclusions:

• The scorpion CNS is largely conserved, supporting its ancient evolutionary history.
• MicroCT imaging provides a powerful tool for detailed CNS analysis in scorpions.
• Further research with more diverse and variable taxa is recommended to fully understand scorpion CNS evolution and variation.