A large-scale systematic framework of Chinese snakes based on a unified multilocus marker system

Area of Science:

• Herpetology
• Molecular Systematics
• Evolutionary Biology

Background:

• Snakes (approx. 3500 species) represent a highly diverse vertebrate group.
• Accurate snake phylogeny and taxonomy are essential for conservation efforts.
• Broad-scale phylogenetic studies require integrated data, necessitating compatible data sources.

Purpose of the Study:

• To propose and validate a unified multilocus marker system for snake systematics.
• To construct the most comprehensive snake phylogenetic framework for China.
• To investigate snake evolutionary histories and divergence times.

Main Methods:

• Developed a multilocus marker system combining 5 mitochondrial, 19 nuclear protein coding (NPC), and 72 snake-specific noncoding intron markers.
• Applied the marker system to over 440 snake samples.
• Constructed a comprehensive phylogenetic framework and estimated divergence times using nuclear data.

Main Results:

• The proposed multilocus marker system successfully recovered robust snake phylogenetic relationships at deep and shallow evolutionary levels.
• Comparison with mitochondrial-only data highlighted the necessity of using diverse markers for accurate evolutionary insights.
• The study generated a comprehensive snake tree for China, confirming previous findings and offering new phylogenetic perspectives.

Conclusions:

• The unified multilocus marker system is effective for snake systematics and evolutionary studies.
• Integrating multiple marker types is crucial for resolving complex snake evolutionary histories.
• The findings provide valuable insights for Chinese snake taxonomy and conservation.