Яндекс.Метрика

Shan-chiPeng,Xue-jianZhu,L.E.Babcok, I.V. Korovnicov

Выпуск: 2 , Год издания: 2015
Сериальное издание: Guizhou Geology
Страницы: 83-89

Аннотация

The generic concept of Arthricocephalus is a matter of great confusion,and the confusion has been exacerbated by establishment of so- called lectotype for its monotypic type species Arthricocephalus chauveaui Bergeron,1899( Lane et al.,1988). In fact,a diagram of the exoskeleton illustrated by Bergeron for the type species was apparently based on a single exoskeleton that is easily identifiable among the specimens used to establish the type species,obviating the necessity for designation of a lectotype. This exoskeleton should be regarded as holotype of the type species that bears the generic concept of Arthricocephalus as revised. The slab that Bergeron studied contains four exoskeletons,one cranidium and one pygidium,all of which,as revised,do not belong to a single species but to species assigned to three separate genera,Arthricocephalus,Oryctocarella and Duyunaspis. The so-called lectotype selected by Lane et al.( 1988) for the type species of Arthricocephalus does not belong to Arthricocephalus chauveaui but to Oryctocarella. A specimen different greatly from the original illustration is selected as lectotype against author's original intention. Three taxa are regarded as junior synonyms of Arthricocephalus,i. e. Arthricocephalus( Arthricocephalites) Chien et Lin in Lu et al.,1974,Haliplanktes Blaker et Peel,1997,and Arthricocephalites Chien et Lin sensu Yuan et al.,2002
индекс в базе ИАЦ: 044330