Cambrian Bradoriida of South China

中国南部寒武纪高肌虫

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Author: Huo Shicheng and Shu Degan
Language: Chinese with English summary
Published on: 1985-01
Hardcover

The Bradoriida include extinct marine small bivalve crustaceans, which seem to be limited to the Cambrian, only a few forms have been found in the Lower Ordovician. The fossils of Cambrian bradoriids are very abundant in South China, which may attain a half In the number of species of the world. The taxonomic position of Bradoriida in Crustacea has long been a debatable issue. The bradoriids were considered to be related to the Ostrathey came to be so widely accepted as the Ostracoda by Matthew, Ivanova, Sylvester0Bradley and Muller. Raymond and Opik assigned them to be related to the Phyllocarida, Adamczak made a comparison of them with egg cases of the Cladocera. On the basis of making a thorough investigation and study of taxonomic history of the Bradoriida and whole contents of bivalve crustaceans, after a full discussion of the corresponding relation between the soft body and carapace, the writers propose eight criteria for the classification of higher categories of the bivalve and bivalve-like crustaceans: 1. Presence or absence of valves gaping at the ends or along the ventral margin, 2. Number of valves, 3. Form and character of the hingement, 4. Position of the scars, 5. Composition of the valve, 6. With or without growth lines, 7. Size of the valve, 8. Number of body segments and structure of appendages. Based on these criteria bradoriids are a heterogeneous group of small bivalve crustaceans and the order Bradoriida can be divided into two suborders, namely Lipabdomina and Abdomina, the former is the ancestor of the Ostracoda and the latter is related to the Phyllocarida and consequently with the Malacostraca. Some bradoriids which have paragrowth lines on their valves show close affinity between them and conchostracans.
There are 245 species (including subspecies) in the systematic description of theis monograph, here the 24 species are briefly described and discussed.


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