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Fossil Mini Trilobite (Changaspis elongate) - 7 mm

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Other item info
Item number:190340612288
Item location:Hong Kong, Hong Kong
Ships to:Worldwide
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Last updated on 08:24:46 PM PDT, Oct 26, 2009 View all revisions
Item specifics
Type: FossilOrigin: China

A nice fossil specimen of a mini trilobite (Changaspis elongate) from Guizhou province(Southwest) of China.

It is dated to the lower Cambrian period.

It measures 7x5 mm.

Total weight is 24.6 grams.

Rank

Name

Author

—

Panarthropoda

 

phylum

Arthropoda

Latreille 1829

class

Trilobita

Walch 1771

order

Corynexochida

Kobayashi 1935

genus

Changaspis

 

Ontogenies are described for the first time for three species of Early Cambrian oryctocephalid trilobites: the oryctocephaline Changaspis elongata Lee, in Chien and the oryctocarines Duyunaspis duyunensis Chang and Chien, in Zhou et al. and Balangia balangensis Chien from the Balang Formation in eastern Ghuizhou Province, south-west China. The complete protaspid to holaspid ontogeny for Duyunaspis duyunensis and incomplete meraspid to holaspid ontogenies for Changaspis elongata and Balangia balangensis are described. The relative degree of ontogenetic variation within the lineage Duyunaspis duyunensis–Balangia balangensis is analysed and indicates that Balangia may have evolved from Duyunaspis by paedomorphosis. Decrease in thoracic segment number and concomitant increase in pygidial segment number in the later genus mirrors the pattern seen in the evolution of another oryctocephalid genus, Arthricocephalus. In both cases, selection was probably targeting an increase in cephalic convexity. This resulted in the evolution of a larger pygidium due to increased elevation of the axis above the substrate. The ontogenetic development of Changaspis provides evidence supporting the view that the Oryctocarinae may be considered as paedomorphic descendants of the Oryctocephalinae.

I have a lot more fossil items in my ebay store(http://stores.ebay.com/Gao-Fu-Collectibles), you may log in my store to view the details.

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Buyer pays US$2.50 for shipping and handling worldwide. Goods will be sent by airmail from Hong Kong and it may take 7-14 days to arrive.

I can do combined shipping if buyer also buys other items in my store. Combine shipping cost for multiple items is calculated by weight. It is US$10 for the first 500g and US$8 for each additional 500 g.



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Buyer pays US$2.50 for shipping and handling worldwide. Goods will be sent by airmail from Hong Kong and it may take 7-14 days to arrive. I can do combined shipping if buyer also buys other items in my store. Combine shipping cost for multiple items is calculated by weight. It is US$10 for the first 500g and US$8 for each additional 500 g.
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