Application of Discriminant Analysis in a Study of Ordovician-Silurian Brachiopod Genus Katastrophomena
详细信息
- 责任者：Huang Bing (State Key Laboratory of Palaeobiology and Stratigraphy ; Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China)
- 刊名：Acta Palaeontologica Sinica
- 出版年：2010
- 卷期：49(2)
- 关键词：扭月贝目 ; Strophomenida ; 判别分析 ; discriminant analysis
- 页码：p.196-209
- 图表：3 illus., 2 plates, 8 tables, 34 refs.
- 分类号：1103
- issnNo：ISSN0001-6616
- isbnNo：CN32-1188/Q
摘要
The two genera of Strophomenidae, Katastrophomena and Strohpomena have been assigned to Furcitellinae and Strophomeninae respectively. But, the characters of these two genera are so close that there exist many different opinions on their taxonomic assignments. In order to differentiate these two genera quantitatively, 31 species assigned to Katastrophomena and Strophomena are examined. There are 52 specimens（including 7 holotypes, 23 paratypes, 6 hypotypes, and 4 lectotypes）being compared. The result shows a significant difference between Katastrophomena and Strophomena which is represented by length ratio of ventral valve and muscle field. The discriminant function is built through the DA processed and its validity is tested. The significant validity of the function indicates that it can be used to differentiate Katastrophomena from Strophomena.