The Spiralia are a morphologically diverse clade of protostome animals, including within their number the molluscs, annelids, platyhelminths and other taxa. [3] The term Spiralia is applied to those phyla that exhibit canonical spiral cleavage , a pattern of early development found in most members of the Lophotrochozoa .

螺旋動物（学名： Spiralia ），又稱螺旋卵裂動物，是原口动物的一大分支，包括多種型態的动物门类，如软体动物门、环节动物门、扁形动物门等 [1] 。 其动物在早期發育的过程中，以经典的“螺旋式”卵裂进行，故得名“螺旋動物”。 一些冠輪動物的成員的早期卵裂，可以看做是螺旋式卵裂的 ...

2023年3月1日 · 第五节 旋裂动物(Spiralia) 2023-03-01. 旋裂动物是具有螺旋式卵裂动物的集合，是两侧对称动物的一大分支，与蜕皮动物和毛颚动物共同组成原口动物。旋裂动物包括三大分支： ...

蜕皮动物 （Ecdysozoa）和 螺旋动物 （Spiralia）都属于原口动物。其卵裂方式为螺旋式，因其不均匀分裂会导致中间有一个时期，出现四个大细胞（Macromere）和四个小细胞（Micromere）。该类动物若具有体腔，则体腔是由中胚层形成的。

2011年12月8日 · The Spiralia (Lophotrochozoa) is a clade consisting of five phyla or groups of phyla whose interrelationships have proved difficult to resolve: Schizocoelia, Platyhelminthes, Gastrotricha, Gnathifera, and Polyzoa. The presence of ciliated ectoderm and primary larvae in the Spiralia appears to be plesiomorphic. Compared to the Ecdysozoa, which ...

The Spiralia is an ancient and diverse clade of invertebrate protostome animals including molluscs, annelid worms, nemertean worms, flatworms and rotifers. One prominent trait in most spiralians are ciliary bands. These bands not only have important functions such as locomotion and feeding but also are key characters in phylogenetic and ...

2020年8月20日 · Spiralia is a large, ancient and diverse clade of animals, with a conserved early developmental program but diverse larval and adult morphologies. One trait shared by many spiralians is the ...

2019年8月22日 · Lophotrochozoa (also called Spiralia), the sister taxon of Ecdysozoa, includes animal taxa with disparate body plans such as the segmented annelids, the shell bearing molluscs and brachiopods, the colonial bryozoans, the endoparasitic acanthocephalans and the acoelomate platyhelminths. Phylogenetic relationships within Lophotrochozoa have been notoriously difficult to resolve leading to the ...

2023年3月2日 · 图6.23 旋裂动物Spiralia的系统发育(基于Struck等，2014;Nielsen，2012) 近年来的分子系统学研究结果几乎颠覆了关于无脊椎动物演化的传统认知，旋裂动物、冠轮动物等术语即是在分子系统发育分析基础上提出的，主要基于分子特征建立的系统发育关系如图6.23所示。

We are a recently formed coalition of scientists who study the beautiful and diverse group of animals known as the Spiralia. We invite everyone working with these animals to join our network, and to participate in planning future meetings, grants, and education efforts. Get involved by signing up for the Spiralia Slack Workspace, our list-serv ...