Institute of Biology, Leiden University, Kaiserstraat 63, 2311GP Leiden, The Netherlands.
Biol Rev Camb Philos Soc. 2010 Feb;85(1):1-33. doi: 10.1111/j.1469-185X.2009.00092.x. Epub 2009 Nov 27.
Lampreys are a group of aquatic chordates whose relationships to hagfishes and jawed vertebrates are still debated. Lamprey embryology is of interest to evolutionary biologists because it may shed light on vertebrate origins. For this and other reasons, lamprey embryology has been extensively researched by biologists from a range of disciplines. However, many of the key studies of lamprey comparative embryology are relatively inaccessible to the modern scientist. Therefore, in view of the current resurgence of interest in lamprey evolution and development, we present here a review of lamprey developmental anatomy. We identify several features of early organogenesis, including the origin of the nephric duct, that need to be re-examined with modern techniques. The homologies of several structures are also unclear, including the intriguing subendothelial pads in the heart. We hope that this review will form the basis for future studies into the phylogenetic embryology of this interesting group of animals.
七鳃鳗是一类水生脊索动物，其与盲鳗和有颌脊椎动物的关系仍存在争议。七鳃鳗胚胎学引起了进化生物学家的兴趣，因为它可能有助于揭示脊椎动物的起源。出于这一原因和其他原因，来自不同学科的生物学家对七鳃鳗胚胎学进行了广泛的研究。然而，许多七鳃鳗比较胚胎学的关键研究对于现代科学家来说相对难以获取。因此，鉴于当前对七鳃鳗进化和发育的兴趣再次兴起，我们在这里对七鳃鳗发育解剖学进行了综述。我们确定了早期器官发生的几个特征，包括肾导管的起源，这些特征需要用现代技术重新检查。几个结构的同源性也不清楚，包括心脏中引人注目的内皮下垫。我们希望本综述将为未来研究这一有趣动物类群的系统发生胚胎学奠定基础。
