Some trilobites mated like extant horseshoe crabs

May 6, 2022
Some trilobites mated like extant horseshoe crabs
An adult male Olenoides serratus trilobite with its claspers, left, and its counterpart. Credit: Sarah Losso

Through careful study of exceptional specimens, graduate student Sarah Losso and faculty-curator Javier Ortega-Hernández show that some trilobites mated very much like extant horseshoe crabs thanks to their highly modified clasper-like limbs. 

"Claspers in the mid-Cambrian Olenoides serratus indicate horseshoe crab–like mating in trilobites", published in Geology
"Before There Were Birds or Bees, This Is How Trilobites Made Babies", New York Times