水龙是一种软壳动物，而不是寒武纪的软体动物

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-05-08

Jie Yang, Wei Li, Ai-lin Chen, Kun-sheng Du, Xiao Peng, Yu Wang, Xi-guang Zhang, Martin R. Smith

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引用次数: 0

摘要

寒武纪的进化辐射以其丰富的奇异和不熟悉的身体形式而闻名，其中许多阐明了主要动物群体的早期祖先。中国云南寒武纪第4期棘棘棘棘鱼化石被解释为软体动物和它们的浮游动物祖先之间的中间物。我们的新材料挑战了这种解释。我们提出了明显的软体动物特征的地形学解释，而不是从附近的地层中识别出与同时期的chancelloriids在解剖学上的显著相似性。我们将水螅虫重新解释为早期分化的总理体，有助于巩固这个长期存在问题的海绵样后生动物群体的早期进化模型。

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Shishania is a chancelloriid and not a Cambrian mollusk

The Cambrian evolutionary radiation is noted for its profusion of bizarre and unfamiliar body forms, many of which illuminate the early ancestry of major animal groups. The spine-covered fossil Shishania aculeata (Cambrian Stage 4, Yunnan, China) has been interpreted as intermediate between mollusks and their lophotrochozoan ancestors. Our new material challenges this interpretation. We propose taphonomic explanations for apparent molluscan features and instead identify prominent anatomical similarities to coeval chancelloriids from nearby strata. Our reinterpretation of Shishania as an early-diverging chancelloriid helps to consolidate a model for the early evolution of this enduringly problematic group of sponge-like metazoans.

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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