Abstract—

Small gastropods from the Jurassic deposits of the European Russia, united into the lower Heterobranchia or Allogastropoda, are described. The families of Ampezzanildidae, Cimidae, Cornirostridae, Ebalidae, and Stuoraxidae are distinguished, and a set of taxa is given without reference to a definite family. The family Ampezzanildidae from the Jurassic deposits is described for the first time on the basis of the mass material, ascribed to the new genus Zizipupa gen. nov. with the sole species of Z. costata sp. nov. The family Cimidae includes the genera of Cristalloella, Rotfanella, Urlocella, and Unzhispira gen. nov. with species C. spiralocostata (Gründel, 1998), R. gerasimovi sp. nov., R. reticulata sp. nov., Urlocella undulata sp. nov., and Unzhispira minuta sp. nov. The genus Heteronatica gen. nov. is included into the family Cornirostridae. This genus is the first siphonostomatous representative of the given family including the sole long-living species H. globosa sp. nov., which is subdivided into subspecies H. globosa globosa and H. globosapromota subsp. nov. The family Ebalidae is represented by the genus Ebala, shells of which are distributed from the Middle Oxfordian to the Middle Volgian. The family Stuoraxidae is described based on two genera Stuoraxis and Aneudaronia gen. nov., including species of S. crassa sp. nov. and A. elegans sp. nov. The genus Doggerostra, which fits into different families of Heterobranchia in terms of shell morphology is represented by the species D. riedeli Gründel, 1998, which was previously known from the Bathonian and Callowian deposits in Poland and Germany, as well as form the Upper Jurassic interval in the Russian Plate. The Middle Volgian subspecies D. riedeli affinis subsp. nov. is distinguished in the composition of this species. In addition, the genus Masaevia gen. nov. with the sole species of M. sinistra sp. nov. is described. Due to so specific shell morphology of this genus, its position in the Heterobranchia system is unclear. It is not improbable that we deal with small planktonic gastropods of protoconchs of unknown group of planktonic or benthic gastropods.

中文翻译：

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俄罗斯侏罗纪沉积物中的杂支菜（天麻）

摘要-

描述了来自欧洲俄罗斯侏罗纪沉积的小型腹足动物，它们被整合到下部的杂支支气管或Allogastropoda中。区分了pe科，Ci科，角线科，E科和and科，并且给出了一组分类单元，而没有提及确定的科。第一次根据侏罗纪沉积物中的Am虫科（Ampezzanildidae），是根据新的Zipzipupa属的大量物质进行描述的。十一月 与Z. costata sp。的唯一种。十一月 Cimidae家族包括Cristalloella，Rotfanella，Urlocella和Unzhispira gen的属。十一月 与C. spiralocostata物种（Gründel，1998），R. gerasimovi sp。nov。，R. reticulata sp。十一月，Urlocella undulata sp.。十一月，和Unzhispira minuta sp.。十一月 Heteronatica gen属。十一月 包括在角Corn科中。该属是给定家族的第一个虹吸口代表，包括唯一的长寿物种H. globosa sp。nov。，分为亚种H. globosa globosa和H. globosa promota亚种。十一月 家庭Ebalidae由属代表Ebala，其中壳由中东牛津期至中东Volgian分布。Stuoraxidae科是根据两个属描述的Stuoraxis和Aneudaronia gen。十一月，包括S. crassa sp。十一月 和A.线虫属。十一月 Doggerostra属，根据壳的形态适合不同的杂种亚科，由D. riedeliGründel，1998物种代表，该物种先前从波兰和德国的巴东期和卡洛期矿床中知道，并形成上侏罗世间隔在俄罗斯板块。沃尔格中亚种D. riedeli affinis亚种。十一月 在这个物种的组成上很出众。此外，Masaevia属。十一月 与M. sinistra的唯一物种sp。十一月 描述。由于该属的壳形态如此特殊，其在杂支气管系统中的位置尚不清楚。我们不可能处理未知种类的浮游或底栖腹足类动物的原生海螺的小型浮游腹足类动物。