The phylum Cycliophora, only recently described in 1995, consists of at least three species of acoelomate, bilaterally symmetrical organisms that are obligate commensalists on the mouthparts of lobsters.

共生虫属 （學名： Symbion）是 环口动物门 （Cycliophora，又名 微轮动物门）、 真微轮动物纲 （Eucycliophora）、 共生虫目 （Symbiida）、 共生虫科 （Symbiidae）下唯一的一 屬，是一類微小的 水 生 动物，於1995年由 莱因哈特·克里斯滕森 （英语：Reinhardt Kristensen） 与 彼得·方奇 （英语：Peter Funch） 发现。 共生蟲的 身体 长度 小于0.5 毫米，普遍 附生 或 共生 于冷水 龙虾 体内。 其身体呈囊状，在 生命 周期的不同阶段具有不同的形态。 环口动物于1995年在 挪 …

They are peculiar microscopic animals, with no obvious close relatives, which were therefore given their own phylum, called Cycliophora. The phylogenetic position of Symbion is still not finally settled. Currently it is placed in the clade Polyzoa along with the phyla Ectoprocta and Entoprocta, based on genetic analysis. [6]

Cycliophora, new phylum Diagnosis. Acoelomate, marine metazoans with bilateral sym­ metry and differentiated cuticle. Compound cilia engaged in filter

环口动物门，又称微轮动物门，是一类水生 无体腔动物，寄生于 龙虾 的口部。 环口动物发现于 1995年，由于该类动物的特殊性，被列为单独的一个门。 环口动物与 轮形动物 可能是近亲。 体长347 微米，宽113微米， 两侧对称，无 体腔，营养体 口器 漏斗型顶端有一环发达的纤毛，消化道U形， 肛门 开口在 口环 外侧底部。 它们身体呈囊状，在生命周期的不同阶段具有不同的形态。

2011年12月8日 · The Cycliophora, a phylum of microscopic organisms that live on the mouth parts of lobsters, comprises only the genus Symbion with two described species, although molecular analyses suggest that there are more species.

2020年3月3日 · There are three to five known species of Cycliophora, but only two of them have been named so far. Characteristics of Cycliophora: Bilaterally symmetrical. Body has more than two cell layers and includes tissues and organs. Has a body cavity, and a U-shaped through gut. Body has a distinct head and trunk. Reproduction is both sexual and asexual.

The Cycliophora are a platyzoan phylum, based on a single genus Symbion. They are so different from other animals that they were put in their own phylum. They were discovered in 1995, and are the most recent new phylum. [1] So far, three species have been found. They live on the bodies of cold-water lobsters.

2023年11月26日 · Phylum Cycliophora are a microscopic invertebrate that exclusively inhabit marine waters located in the northern hemispheres of the world. They were first discovered in 1995 and are known to frequent the North American, European, and Scandinavian waters.

2001年5月30日 · The Cycliophora is the most recently described animal phylum and is based on a single species, Symbion pandora, which was discovered on the mouthparts of the Norway lobster Nephrops norvegicus.