门: 内肛亚门
纲: 未定
目: 未定
科: 未定
属：杯型虫属
种: 瘤状杯形虫
描述:
固着个体，由两部分组成，包括上部杯状结构和下部柄组成。柄部末端为一个膨大的盘状结构。个体周身被矿化或可能硬化的椭圆形的骨片覆盖。内部发育有U形消化道，由一个狭窄的前食管，与凹陷的口部开口相连的膨大胃，弯曲的狭窄的肠道以及肛门开口组成。嘴和肛门开口被包围在同一个触手环内；触须，纤细，从花萼的上边缘突出。长柄末端具一个盘状结构，多用于附着在坚硬的基底。
Phylum: Entoprocta
Class: uncertain
Order: uncertain
Family: uncertain
Genus：Cotyledion Luo & Hu in Luo, Hu, Chen, Zhang & Tao, 1999
Specie: Cotyledion tylodes Luo & Hu in Luo, Hu, Chen, Zhang & Tao, 1999
Description:
Sessile bipartite body, comprising an upper cup-shaped calyx and lower stalk terminated by an attachment disc, completely covered by mineralized or possibly sclerotized, oval sclerites; internal anatomy with U-shaped alimentary canal: comprising a narrow anterior esophagus, extending from a recessed mouth cavity and followed by an enlarged stomach and a recurved narrow intestine, terminating in an anal opening. Both mouth and anal opening are enclosed within the same tentacle ring. Tentacles, slender, protruding from the upper margin of calyx. Stalk variable in length and terminated by knob-shaped holdfast for attachment to hard substrates.
时代：寒武纪，第二统，第三阶
主要产地: 中国云南省澄江生物群
Age: Cambrian, Series 2, Stage 3 (~518 million years ago)
Principal localities: Chengjiang Lagerstätten, Yunnan Province, China
Zhang, Z.F. et al. 2013. A sclerite-bearing stem group entoproct from the early Cambrian and its implications. Sci. Rep. 3, 1066.