Evidence for Monophyly and Arthropod Affinity of Cambrian Giant Predators

  title={Evidence for Monophyly and Arthropod Affinity of Cambrian Giant Predators},
  author={Jun-yuan Chen and Lars Ramsk�ld and Gui-qing Zhou},
  pages={1304 - 1308}
The Chinese Early Cambrian Chengjiang fauna includes three different anomalocaridids, a globally spread, extinct marine group including the largest known Cambrian animals. Anomalocaridids were active predators, and their presence implies that a complex ecosystem appeared abruptly in the earliest Phanerozoic. Complete specimens display several sets of characters shared only with some other exclusively Cambrian forms. This evidence indicates that anomalocaridids, Opabinia, and Kerygmachela form a… 
Distinguishing anomalocaridids from arthropods and priapulids
The Chengjiang fossil lagerstatte has yielded four described species of dinocaridids, one of which appears to belong to a new large priapulid, described here as Omnidens amplus gen. et sp.
Direct evidence for predation on trilobites in the Cambrian
A fossil arthropod similar to Fuxianhuia and displaying an exceptionally well–preserved alimentary canal with in situ gut contents is reported from the lower Middle Cambrian of South China, augments the small number of previously described associations providing more or less direct evidence of predator–prey relationships in Cambrian epibenthic communities.
Origin, diversification, and relationships of Cambrian lobopods
Abstract As an extinct group, the origin, diversification and relationships of Cambrian lobopods have long been one of the most hotly-debated subjects. Lobopods used to be regarded as closely related
Cambrian Sphenothallus from Guizhou Province, China: early sessile predators
Abstract Two species of Sphenothallus (Cnidaria) from Cambrian rocks of eastern Guizhou, China, are reported. One species, Sphenothallus songlinensis n. sp., from the Niutitang Biota (Lower Cambrian:
Occurrence of the eudemersal radiodont Cambroraster in the early Cambrian Chengjiang Lagerstätte and the diversity of hurdiid ecomorphotypes
Abstract Radiodonts are a diverse clade of Lower Palaeozoic stem-group euarthropods that played a key role in the emergence of complex marine trophic webs. The latest addition to the group,
New anomalocaridids (Panarthropoda: Radiodonta) from the lower Cambrian Chengjiang Lagerstätte: Biostratigraphic and paleobiogeographic implications
Abstract Radiodonts are a morphologically and ecologically diverse clade of stem-group euarthropods that occupied numerous ecological niches in early animal ecosystems. Many Cambrian taxa are
Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah
In Cambrian fossil Lagerstätten like the Burgess Shale, exceptionally preserved arthropods constitute a large part of the taxonomic diversity, providing opportunities to study the early evolution of
Complexity and diversity of eyes in Early Cambrian ecosystems
The specimen represents the oldest microanatomical evidence confirming the occurrence of highly developed vision in the early Cambrian, over 2,000 ommatidia in each eye, and supports the hypothesis that the origin and evolution of ‘good vision' was a key trait that promoted preferential diversification and formed the foundation of modern benthic ecosystems in theEarly Cambrian ocean.
An onychophoran-like fossil animal, Paucipodia inermis gen. et sp. nov., is described from the Lower Cambrian Chengjiang lagerstatte in Yunnan, China. The animal was soft-bodied, and possessed six
A giant Ordovician anomalocaridid
Phylogenetic analyses support a position of anomalocaridids in the arthropod stem, as a sister group to the euarthropods, and confirm the presence of a dorsal array of flexible blades attached to a transverse rachis on the trunk segments.


Opabinia Anomalocaris, unique Cambrian 'arthropods'
Observations indicate that the two genera have important similarities, including scale-like structures arranged segmentally in transverse dorsal sets, which are separated by transverse tergal plates in Anomalocaris.
The occurrence of the giant arthropod Anomalocaris in the Lower Cambrian of southern California, and the overall distribution of the genus
The occurrence of Anomalocaris canadensis Whiteaves, 1892 in the Latham Shale of the Marble and Providence Mountains, San Bernardino County, California is described. The distribution of the genus is
The oldest arthropods of the East European Platform
Cassubia Lendzion 1977 and Liwia new name found in the subsurface Zawiszany formation of the basal Cambrian in NE Poland are identified as an anomalocarid and a ‘soft-bodied’ trilobite, respectively, each being the oldest representative of its group.
Evidence from 12S ribosomal RNA sequences that onychophorans are modified arthropods.
Parsimony analysis suggests that onychophorans form a sister group to chelicerates and crustaceans plus hexapods, but this relationship is not well supported by monophyly testing, which conflict with current hypotheses of evolutionary pathways within arthropods.
A Cambrian gilled lobopod from Greenland
The discovery of several 'Burgess Shale'-like faunas in the Cambrian has added significant new data to the debate about the nature of the 'Cambrian explosion', and the data from Kerygmachela may suggest a biphyletic origin for the arthropod grade of organization.
Composition and preservation of the Chengjiang fauna –a Lower Cambrian soft‐bodied biota
The Lower Cambrian Chengjiang fauna is reviewed and shown to be closely comparable with the younger Burgess Shale fauna. but with various differences in detail. A diverse group of more or less
New early Cambrian animal and onychophoran affinities of enigmatic metazoans
A new 'armoured lobopod' from the Chengjiang fauna is described and shows close affinity with the enigmatic Microdictyon, and soft-part anatomy suggests that the group has affinities with the Burgess Shale 'lobopod', Aysheaia.
A Burgess shale-like fauna from the Lower Cambrian of North Greenland
The 'Cambrian explosion' refers to the major adaptive radiation of the metazoans during the earliest Phanerozoic, an event that is best known by the abrupt appearance of hard parts near to the
The Largest Cambrian Animal, Anomalocaris, Burgess Shale, British Columbia
It is suggested that this animal, the largest known from Cambrian rocks, swam by using the series of closely spaced lateral lobes essentially as a lateral fin along which waves of motion were propagated.
Calibrating rates of early Cambrian evolution.
Uranium-lead zircon data from lower Cambrian rocks located in northeast Siberia indicate that the Cambrian period began at approximately 544 million years ago and that its oldest (Manykaian) stage lasted no less than 10 million years.