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A possible Cambrian stem-group gnathiferan-chaetognath from the Weeks Formation (Miaolingian) of Utah
Journal of Paleontology ( IF 1.4 ) Pub Date : 2020-03-03 , DOI: 10.1017/jpa.2020.4
Simon Conway Morris , Ru D.A. Smith , Jennifer F. Hoyal Cuthill , Enrico Bonino , Rudy Lerosey-Aubril

In recent years the plethora of ‘weird wonders,’ the vernacular for the apparently extinct major body plans documented in many of the Cambrian Lagerstätten, has been dramatically trimmed. This is because various taxa have been either assigned to known phyla or accommodated in larger monophyletic assemblages. Nevertheless, a number of Cambrian taxa retain their enigmatic status. To this intriguing roster we add Dakorhachis thambus n. gen. n. sp. from the Miaolingian (Guzhangian) Weeks Formation Konservat-Lagerstätte of Utah. Specimens consist of an elongate body that lacks appendages but is apparently segmented. A prominent feeding apparatus consists of a circlet of triangular teeth, while posteriorly there are three distinct skeletal components. D. thambus is interpreted as an ambush predator and may have been partially infaunal. The wider affinities of this new taxon remain conjectural, but it is suggested that it may represent a stem-group member of the Gnathifera, today represented by the gnathostomulids, micrognathozoans, and rotifers and possibly with links to the chaetognaths.UUID: http://zoobank.org/22113e6b-f79e-4d06-9483-144618a61327

中文翻译:

犹他州Weeks组(苗岭期)可能存在的寒武纪干群颚类-毛颚类

近年来,许多“奇怪的奇迹”,即在许多寒武纪Lagerstätten 中记录的明显已灭绝的主要身体计划的白话,已经大大减少。这是因为各种分类群要么被分配到已知的门中,要么被容纳在更大的单系组合中。尽管如此,一些寒武纪分类群仍然保持着神秘的地位。在这个有趣的名单中,我们添加达科哈奇n. 将军 n. sp。来自犹他州苗岭期(古章期)周组 Konservat-Lagerstätte。标本由一个细长的身体组成,没有附属物,但显然是分段的。一个突出的喂食装置由一个三角形齿圈组成,而后面有三个不同的骨骼成分。D. 桑布斯被解释为伏击捕食者,可能是部分动物。这个新分类群的更广泛的亲缘关系仍然是推测性的,但有人认为它可能代表了 Gnathifera 的茎组成员,今天由 gnathostomulids、micrognathozoans 和 rotifers 代表,并且可能与 chaetognaths.UUID 有联系:http://zoobank.org/22113e6b-f79e-4d06-9483-144618a61327
更新日期:2020-03-03
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