Middle Cambrian Arthropod Embryos with Blastomeres

  title={Middle Cambrian Arthropod Embryos with Blastomeres},
  author={X. G. Zhang and Brian R. Pratt},
  pages={637 - 639}
A phosphatized Middle Cambrian (∼510 million years ago) fauna from Duyun, southern China, has yielded fossil embryos that may be of arthropod affinity and could belong to the co-occurring eodiscid trilobite Pagetia sp. The shell was most likely flexible and possessed at least two thin layers. Four embryos reveal blastomeres, and two embryonic stages are represented. These embryos demonstrate that the basic paradigm for the growth of the invertebrate embryo has not changed in more than half a… 
New early Cambrian bilaterian embryos and larvae from China
New phosphatized eggs and embryos, partly indicating germ band formation, and the earliest known larvae of early bilaterians are described, indicating affinities with protostomes, most probably within an ancestral arthropodan lineage.
Phosphatized embryo fossils from the Cambrian explosion
The earliest Cambrian (Meishucunian) phosphatized metazoanOlivooides from the Yangtze platform is represented by dierent developmental stages: from blastula through possible gastrula to tissue
Fossilized Metazoan Embryos from the Earliest Cambrian
Small globular fossils known as Olivooides and Markuelia from basal Cambrian rocks in China and Siberia contain directly developing embryos of metazoans, which shows similarities to coronate scyphozoans and to their probable Paleozoic representatives, the conulariids.
Early Cambrian phosphatized blastula- and gastrula-stage animal fossils from southern Shaanxi
A nearly complete developmental sequence — from a fertilized egg, via blastodisc formation, blastula development, blastodISC enlargement toward gastrulae, to tissue differentiation — can be discerned in this collection.
Fossilized metazoan embryos—The historical testimony of the Cambrian explosion
  • C. Yin
  • Environmental Science
  • 1999
The palaeoembryology is a new field in palaeontology, and it has not been considered an important field before, because the invertebrates’ eggs or embryos are minute size and without mineralized envelope.
Embryonic Development of a Middle Cambrian (500 Myr Old) Scalidophoran Worm
This new material clarifies the affinity of the first fossilized invertebrate embryos ever described, from the same rocks, which were originally attributed to arthropods, presumably trilobites, and infers likely diversified cleavage patterns for stem members of this group, and yields fresh insight into the embryogenesis of early metazoans as a whole.
Lower Cambrian phosphatized Punctatus from southern Shaanxi and their ontogeny sequence
Phosphatized and three-dimensionally preserved embryos and spherical fossils of metazoan recovered from the Kuanchuanpu Member, Dengying Formation in southern Shaanxi, China provide nice
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Exceptionally preserved early Cambrian bilaterian developmental stages from Mongolia
Fossilized invertebrate embryonic and later developmental stages from the early Cambrian Salanygol Formation of Dzhabkan Microcontinent of Mongolia are identified as early post-embryonic developmental stages of camenellans, an early clade of stem-brachiopods, supporting the conjecture that molluscs and brachiopod are descended from an ancestral vermiform and slug-like bodyplan.
Cambrian Fossil Embryos from Western Hunan, South China
The exquisitely preserved fossil embryos of Markuelia recovered from the limestones of the Middle Cambrian Haoqiao Formation and Upper Cambrian Bitiao formation in western Hunan, South China are


Possible insect eggs in palynological preparations from the Aptian (Middle Cretaceous) of Brazil
A group of microfossils is described from Middle Cretaceous (Aptian) sediments of Brazil considered to have formed in a brackish-water, possibly deltaic environment. The microfossils have the form of
Fossilized Eggs in a Pennsylvanian Blastoid
A single specimen of Pentremites rusticus (Echinodermata, Blastoidea) from the Early Pennsylvanian of Oklahoma has hundreds of apparent eggs in one of its abnormal anal hydrospire groups. This rare
A Fossil Noctuid Moth Egg from the Late Cretaceous of Eastern North America
A moth egg assignable to the family Noctuidae (Lepidoptera) is described from 75-million-year-old sediments from Martha's Vineyard, Massachusetts, which may provide insight into the coevolution of moths and flowering plants, as well as have implications for the evolution of bats.
Embryonic development of the freshwater crayfish (Pacifastacus leniusculus Dana): A scanning electron microscopic study
The egg development of the freshwater crayfish under laboratory conditions is studied from spawning to hatching and the chronology of the different embryonic phases is established at one specific temperature (15.5°± 1°C).
A Cambrian gilled lobopod from Greenland
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  • Biology, Environmental Science
  • 1993
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.
The Early Radiation and Relationships of the Major Arthropod Groups
Cladistic analysis of characters of Cambrian and living representatives (excluding Uniramia) shows that trilobites and chelicerates are relatively advanced compared with "crustaceans," and there are doubts whether the latter constitute a national group.
Moult stages and dimorphism of Early Cambrian bradoriids from Xichuan, Henan, China
Five new species proposed are Monasterium bucerum, Houlongdongella xichuanensis, Ovaluta henanensis, Phaseolella dimorpha, and P. curvata, which may be the earliest (Lower Cambrian) record so far known in Bradoriida.
Macromolecular resolution of fossilized muscle tissue from an elopomorph fish
THE Santana Formation (Lower Cretaceous, Aptian/Lower Albian) of Ceara, Brazil, contains many exceptionally preserved fish fossils within carbonate concretions1,2. These concretions formed before
Konservat-Lagerstätten: cause and classification
A review of the processes required for exceptional preservation of soft-bodied fossils demonstrates that anoxia does not significantly inhibit decay and emphasizes the importance of early diagenetic
Phosphatization of soft-tissue in experiments and fossils
Soft-tissues phosphatized in laboratory experiments closely resemble fossil phosphatized soft-tissues, indicating that similar processes were involved. The smaller the aggregations of calcium