Unveiling the early evolution of black corals.

Area of Science:

• Paleontology
• Marine Biology
• Evolutionary Biology

Background:

• Black corals (Anthozoa: Antipatharia) are deep-sea cnidarians with estimated Ediacaran or Cambrian origins.
• The fossil record of black corals is limited, with only the Early Ordovician Sinopathidae family previously documented.
• The classification of Sinopathidae has been debated due to morphological discrepancies.

Purpose of the Study:

• To describe new transitional species of Sterictopathes from the Middle Ordovician.
• To address the questioned affinity of the fossil family Sinopathidae.
• To provide new insights into the early evolution of Hexacorallia.

Main Methods:

• Paleontological excavation and description of fossil specimens.
• Morphological analysis of skeletal structures.
• Phylogenetic analysis to establish new family classifications.

Main Results:

• Two transitional species of Sterictopathes were identified from the Middle Ordovician of Shaanxi, China.
• The genus Sterictopathes was elevated to a new family, Sterictopathidae fam. nov.
• An evolutionary trend toward axial skeleton regularity in Antipatharia was observed.

Conclusions:

• The discovery confirms the presence of Ordovician black corals, expanding their fossil record.
• This research bridges gaps in understanding black coral evolution.
• The findings provide a foundation for future paleontological discoveries in Hexacorallia.