泥盆纪双壳类假似栗蛤属(Pseudonuculana Pojeta,Zhang and Yang,1986)之修订

Taxonomic revision of the Devonian genus Pseudonuculana Pojeta,Zhang and Yang,1986(Bivalvia:Cucullellidae)

对Nuculoidearesupina Guo,1985、PseudonuculanazhaoiPojeta,Zhangand Yang,1986和Skyphoconcha beichuanensis Liu and Gu,1988这3个种进行比较后,确定了它们的同物异名关系,确认船形蛤属(Skyphoconcha Liu and Gu)是假似栗蛤属(Pseudonuculana Pojeta,Zhang and Yang)的次异名。澄清了此属的韧带性质,并对其属征进行修订。鉴于其无弹体窝,外套线完整,现将它改归至小帽蛤亚科(Cucullellinae)。根据"国际动物命名法规"第四版,作为首异名的NuculoidearesupinaGuo,虽享有优先权,却不可以被引证为本属的模式种;原始指定的模式种Pseudonuculana zhaoi仍保持其模式种携名者的地位不变。

After comparing Nuculoidea resupina Guo,1985,Pseudonuculana zhaoi Pojeta,Zhang and Yang,1986 and Skyphoconcha beichuanensis Liu and Gu,1988.There is no doubt that they belong to the same species.This confirms that the genus name Skyphoconcha Liu and Gu is a junior synonym of Pseudonuculana Pojeta,Zhang and Yang.The opisthodetic external ligament of the Pseudonuculana is fully confirmed and its generic diagnosis is revised.Without resilium and pallial sinus,Pseudonuculana is removed from the Nuculanidae and reclassified as a member of Cucullellinae.According to The International Code of Zoological Nomenclature(4 th Edition),Nuculoidea resupina Guo,as a senior synonyms,has priority over the other two junior synonyms but should not be cited as the type species of the genus.As the name-bearing type of the type species,the original designated type species Pseudonuculana zhaoi Pojeta,Zhang and Yang remains unchanged even though it is a junior synonym of Nuculoidea resupina Guo.