Tentaculate fossils from the Cambrian of Canada (British Columbia) and China (Yunnan) interpreted as primitive deuterostomes.
Tentaculate fossils from the Cambrian of Canada (British Columbia) and China (Yunnan) interpreted as primitive deuterostomes.
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加拿大（不列颠哥伦比亚省）和中国（云南）寒武纪的触手化石被解释为原始后口动物
DOI：
10.1371/journal.pone.0009586
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发表时间：
2010-03-08
期刊：
影响因子：
3.7
通讯作者：
Shu D
中科院分区：
文献类型：
--
作者：
Caron JB;Conway Morris S;Shu D
分子和形态学证据将半索动物和棘皮动物统一为Ambulacraria，但它们最早的历史几乎完全是史前的。这是因为步肢动物的形态差异和缺乏明显的茎群。本文描述了采自中寒武世Burgess页岩Lagerstätte的一个新分类群Herpetogaster collinsi gen. et sp. nov.。这种软体蠕虫状动物有一对细长的树突状口触角，一个灵活的匍匐茎与附着盘，和一个再弯曲的躯干与至少13节，是直接向右转。一个分化的但不成环的肠被包围在一个由肠系膜悬挂的囊中。它包括一个短咽，一个明显的豆状胃，其次是一个狭窄的肠长度相等。这个新的分类单元，与下寒武统的金雀花和迄今为止神秘的盘状eldoniids（寒武-泥盆纪）一起，形成了一个独特的分支（在此称为寒武纪）。虽然他们的关系的一个假设将期待lophotrochozoans（特别是内肛），我们认为，证据是更符合他们是原始的后口动物，与具体的比较进行了翼鳃半索动物和前辐射棘皮动物。在此基础上，一些最早的步足动物被解释为软体动物，有一个肌肉发达的茎，并拥有突出的触角。
Molecular and morphological evidence unite the hemichordates and echinoderms as the Ambulacraria, but their earliest history remains almost entirely conjectural. This is on account of the morphological disparity of the ambulacrarians and a paucity of obvious stem-groups. We describe here a new taxon Herpetogaster collinsi gen. et sp. nov. from the Burgess Shale (Middle Cambrian) Lagerstätte. This soft-bodied vermiform animal has a pair of elongate dendritic oral tentacles, a flexible stolon with an attachment disc, and a re-curved trunk with at least 13 segments that is directed dextrally. A differentiated but un-looped gut is enclosed in a sac suspended by mesenteries. It consists of a short pharynx, a conspicuous lenticular stomach, followed by a narrow intestine sub-equal in length. This new taxon, together with the Lower Cambrian Phlogites and more intriguingly the hitherto enigmatic discoidal eldoniids (Cambrian-Devonian), form a distinctive clade (herein the cambroernids). Although one hypothesis of their relationships would look to the lophotrochozoans (specifically the entoprocts), we suggest that the evidence is more consistent with their being primitive deuterostomes, with specific comparisons being made to the pterobranch hemichordates and pre-radial echinoderms. On this basis some of the earliest ambulacrarians are interpreted as soft-bodied animals with a muscular stalk, and possessing prominent tentacles.
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影响因子：
56.9
作者：
Clark, HL
通讯作者：
Clark, HL
影响因子：
9.2
作者：
Glenner, H;Hansen, AJ;Willerslev, E
通讯作者：
Willerslev, E
影响因子：
3.9
作者：
Anderson, FE;Córdoba, AJ;Thollesson, M
通讯作者：
Thollesson, M
DOI：
10.1073/pnas.1431177100
发表时间：
2003-07-08
影响因子：
11.1
作者：
Chen, JY;Huang, DY;Feng, M
通讯作者：
Feng, M
影响因子：
3.4
作者：
Bourlat SJ;Rota-Stabelli O;Lanfear R;Telford MJ
通讯作者：
Telford MJ