在三动物及其亲属的背部生殖的多种起源
Kun-Sheng Du1,2, Jin Guo2,3, Sarah R Losso4
1Research Center of Paleobiology, Yuxi Normal University, Yuxi, China.
eLife
|October 2, 2024
概括
欧类变部在Artiopoda早期进化,但它们的确切起源仍在争论中. 对Acanthomeridion的新分析表明,腹板可能与三动物的自由脸相同,这会影响进化解释.
科学领域:
- 古生物学的古生物学
- 进化生物学 进化生物学
- 节肢动物形态学 节肢动物形态学
背景情况:
- 欧类动物表现出显著的多样性,在外骨 sutures 沿着ecdysis (molting) 增长.
- 在古生物学期,包括三生物在内的类动物占主导地位;三生物沿脑部 sutures. molted.
- 在早期的类动物中存在类似的线,这引发了关于线进化的疑问:在群体内深处或多个融合的起源.
研究的目的:
- 为了研究早期类动物中生态的进化起源.
- 为了澄清Acanthomeridion的遗传位置及其与三虫的关系.
- 为了检查Acanthomeridion的腹板和三虫头骨结构之间的潜在同质性.
主要方法:
- 使用CT扫描对新的,保存良好的Acanthomeridion材料的详细描述.
- 对腹腔解剖学和附属物的分析,专注于腹腔板.
- 用三种编码策略进行植物遗传学分析,用于腹板同质化 (与三虫自由脸,头骨双重或独立衍生相比).
主要成果:
- CT扫描显示了以前未知的腹部解剖学和附件在阿坎托梅里迪翁.
- 编码腹板与三动物自由脸相同,将阿坎托梅里迪翁定位为三动物的姐妹,但在Artiopoda中,背部仍然分散.
- 将腹板编码为同类于双或独立衍生的编码并不能恢复Acanthomeridion作为三虫的姐妹,这表明腹板与三虫双/自由脸不同.
结论:
- 阿坎托梅里迪翁腹状板的同质性显著影响其在Artiopoda.
- 如果同类于自由脸,Acanthomeridion与三虫有密切的关系,但背部生殖的进化仍然复杂.
- 替代的同类学解释表明腹板是一个独特的特征,改变了对早期类动物进化和变策略的理解.
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