AI Article Synopsis
- Researchers identified a new species of annelid worm from the early Cambrian Xiaoshiba biota in China, which is important due to the rarity of soft-bodied fossil records.
- The fossil features a unique cage-like structure formed by its front appendages, suggesting it lived underground (endobenthic lifestyle).
- This discovery marks the earliest evidence of burrowing behavior in annelids and indicates that the development of similar head structures in annelids likely occurred independently through convergent evolution.
Article Abstract
Soft-bodied fossils of annelids from the Cambrian are relatively rare but provide vital insights into the early evolution and diversification of annelids. Here we describe a new annelid, gen. et sp. nov., from the early Cambrian (Stage 3) Xiaoshiba biota of Kunming, Yunnan Provence, China. This worm is obliquely oriented in the sediment, and is characteristic of a cephalic cage-like structure formed by the anteriorly directed parapodia and long chaetae of chaetiger 1, strongly suggesting an endobenthic lifestyle. This first report of an annelid worm from the Xiaoshiba biota provides the earliest known plausible evidence of burrowing behaviour in Annelida. Phylogenetic analyses recover in the polytomy with other crown-group Annelida, indicating that the evolution of cephalic cage in Annelida is most likely convergent.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11461068 | PMC |
| http://dx.doi.org/10.1098/rsbl.2024.0357 | DOI Listing |
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