Groundbreaking Discovery: New Genus and Species of Large Appendage Arthropods Unveiled

A collaborative effort between Chinese and foreign researchers has led to the discovery of a new genus and species of large appendage arthropods from the Ordovician period. The team, comprising scientists from Yunnan University, the University of Oxford, Yale University, and the University of California, Berkeley, made the groundbreaking find in the Ordovician Beecher Trilobite Formation biota in New York State, USA.

The research, published in the esteemed academic journal Current Biology, utilized micro-CT equipment to conduct high-precision scans of the new species fossils. Computer three-dimensional reconstruction and virtual anatomy technology were then employed to reveal the first new genus and species of Lincholidae from the Ordovician, Lomankus edgecombei.

Phylogenetic analysis indicates that Lomankus edgecombei and Linchouli species are sister groups, situated at the end of the branch. The body length of this species ranges from 8 to 20 mm, with notable characteristics including a greatly reduced distal limb segment and a slender whip segment directly connected to the limb segment. This suggests that the species’ function is perception rather than hunting.

Additional features of Lomankus edgecombei include an inverted triangular front end of the tail, a tail spine longer than the animal’s body length, and a well-developed oral plate area preserved beneath the cephalon. The discovery of this species demonstrates that the dominant Lincholi arthropod from the Cambrian period survived in the Ordovician, with its large appendages evolving from a predatory function to a sensory function.

The lack of evidence of eyes and other morphological changes suggests that Lomankus edgecombei likely occupied benthic ecological niches. This study provides new insights into the evolution of apex carnivores in the Cambrian period and offers fresh evidence and theoretical support for understanding the evolution of early arthropods.