ON THE CAMBRIAN (SERIES 2)TRILOBITE GENUS USHBASPIS OF CHINA-APPLICATION OF CLUSTER ANALYSIS TO THE TAXONOMY OF USHBASPISSPECIES
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Abstract:
In the present paper，the method of“Q-mode cluster analysis”is used in a taxonomic study of 14 cranidia belonging to Ushbaspis trilobite species in the Series 2 of Cambrian．The statistical mea-surement of similarity is the incremental sum of error squares (△E)．Here，the author uses the variables in the ratio form (8)．The resemblance relation matrices of all specimens are formed through calculation of the increments of sum of error squares between those specimens(see Table II)．Finally，the two-dimen-sional dendrogram is drawn by stepwise calculation(see text-fig．3)．The dendrogram is divided into five groups by the line having a value of increments of sum of error squares 0．35．They correspond to：Species group of Ushbaspis granulata Pokrov-skaya，1965 (Species Group A)，which has only one choice for the type species of Ushbaspis (see text-fig．1．14)．Species group of Metaredlichioides hubeiensisLin，1978 (Species Group B)-contains four species including Metaredlichioides hubeiensis Lin，1978(see text-fig．1．2)；Metaredlichioides conicus Zhang，1981 (see text-fig．1．12)； Metared-lichioides tarimenensis Zhang，1981(see text-fig1．13)；Metaredlichioides kalpinensis Zhang，1981(see text-fig．1．11)．Species group of Metaredlichioides constrictus Chien and Yao，1974(Species Group C)-contains three species including Metaredlichioides const-rictus Chien and Yao，1974 (see text-fig．1．1)；Metaredlichioides sichuanensis Qian and Yao，1980 (see text-fig．1．7)；Metaredlichioides dan-zhaiensis Zhang and Lin ，1980 (see text-fig．1．10)．Species group of Metaredlichioides meizi-wanensis Yin，1978 (Species Group D) -contains five species：Metaredlichioides constrictus Qian and Yao (see text-fig．1．3)； Metaredlichioides szechuanensis Chien and Yao (see text-fig．1．4)；Metaredlichioides meiziwanensis Yin，1978 (see text-fig．1．5)including Metaredlichioides long-xiensis Zhang，Lin and Zhou，1980 (see text-fig．1．9)；Metaredlichioides elevatus Qian and Yao，1980(see text-fig．1．8)．Species group of Metaredlichioides shiqian-ensis Yin，1978 (Species Group E)has only one species(see text-fig．1．6)．Based on the application of cluster analysis of 14 Ushbaspis trilobites species in this study，the author proposed the opinion on the mergence and emendation of some species(see table III)．
