Unique pattern of injuries in Olenoides serratus from the Burgess Shale elucidate moulting process in trilobites
Ecdysozoans is one of the most abundant and diverse groups of metazoans and grow through moulting the rigid exoskeleton that provided protection. But the moulting process is often dangerous, resulting in malformations or death. Injuries have been well documented in the calcitic exoskeleton of trilobites, some of which have been attributed to moulting complications when long spines are deformed.…
Trilobites, members of the ecdysozoan group, grow through moulting their rigid exoskeletons for protection, yet this process can be perilous and lead to malformations or death. Injuries have been observed in the calcitic exoskeleton of trilobites, some linked to complications during moulting when long spines are deformed. Such injuries are typically found in the trunk rather than the cephalon, with abnormal genal spines rarely documented.
The researchers analyzed eleven specimens of Olenoides serratus from the Burgess Shale, a Cambrian site in Wuluian, and found a higher incidence of genal spine malformations compared to other trilobites. The unusual pattern of these malformations may be attributed to moulting injuries caused by the long and delicate genal spines in O. serratus.
Trilobites undergo moulting by curving ventrally to press their cephalon into the substrate and open the facial sutures, exerting force on the librigenae. To exit the exuvia, the genal spines need to bend as the old librigenae dips ventrally along the anterior edge, resulting in the injured genal spines seen in O. serratus. This process of moulting leading to injuries may also be observed in other early Euarthropods.
Written by urgent.news from bioRxiv's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
