DISSERTATION RESEARCH: Assessing early molluscan evolution with emphasis on aplacophorans
DISSERTATION RESEARCH: Assessing early molluscan evolution with emphasis on aplacophorans
批准号:
1210518
负责人:
Kenneth Halanych
金额:
$1.47万
依托单位:
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
2012
资助国家:
美国
项目状态:
已结题
起止时间:
2012-06-01 至 2014-05-31
中文摘要
据估计,软体动物有20万个物种,是物种第二丰富的动物群体。许多软体动物具有重要的经济、生态或生物医学价值。此外,软体动物的身体规划也非常多种多样,从鼻涕虫到文蛤再到巨型鱿鱼。由于化石记录中软体动物的多样性、多样性和丰富性,近200年来,人们对确定该类群的原始状态一直很感兴趣。长期以来,人们一直认为这种类似蠕虫的软体动物群对理解早期软体动物的进化很重要。然而,人们对这个以深海为主的类群的进化史(系统发育)知之甚少。这项研究旨在利用传统和尖端的新一代DNA测序技术相结合来重建无足目动物的系统发育。将使用传统显微镜收集新的形态数据,并将特征映射到系统发育图上,以推断出拟步甲目以及整个软体动物的原始特征。对于古生物学家和无脊椎动物生物学家来说,了解这些动物是如何进化的将是非常有兴趣的,他们长期以来一直试图了解这个多样化和迷人的群体的早期进化。此外,由于软体动物是神经生物学和寄生虫学领域的重要模型,这项工作的结果将直接为生物医学研究提供信息。
英文摘要
With an estimated 200,000 living species, Mollusca is the second most species-rich animal group. Many molluscs are economically, ecologically, or biomedically important. Additionally, the molluscan body plan is extremely varied, ranging from slugs to clams to giant squid. Because of molluscs' variation, diversity and abundance in the fossil record, there has been great interest in identifying the primitive condition of the group for nearly 200 years. The worm-like mollusc group called Aplacophora (Latin for "without a shell") has long been thought to be important to understanding early molluscan evolution. However, little is known about the evolutionary history (phylogeny) within this mostly deep-sea group. This research aims to reconstruct aplacophoran phylogeny using a combination of traditional and cutting-edge, next-generation DNA sequencing technologies. New morphological data will be collected using traditional microscopy and characters will be mapped onto the phylogeny to infer primitive features of Aplacophora as well as Mollusca as a whole. Understanding how these animals have evolved will be of great interest to paleontologists and invertebrate biologists who have long sought to understand the early evolution of this diverse and fascinating group. Moreover, as molluscs are important models in the fields of neurobiology and parasitology, the results of this work will directly inform biomedical research.
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