【摘要】 <正> 锥石类化石的生物系统分类位置还不十分肯定,但目前多数人认为应该归入腔肠动物门真水母纲。据目前所知,我国发现的锥石化石主要产于晚古生代。本文所描述的锥石化石,产于四川省江油县马鞍塘车站附近的晚三叠世卡尼期地层。与该化石共生的主要是双壳类Myophoria(Co-更多还原

【Abstract】 In this paper two new species and one indeterminable species of Conularida are described, namely, Conularia sichuanensis sp. nov., C. maantangensis sp. nov. and Conulariopsis sp.. All of them were found from the Carnian of Late Triassic in the Maantang district, Jiangyou County, Sichuan Province. As far as known, the Carnian in this region is the highest Conularida-bearing horizon in China. This discovery is of both theoretical and practical significance in studying the fauna and stratigraphic correlation of this region.Description of new species Family Conulariidae Walcott, 1886Genus Conularia Sowerby, 1821Conularia sichuanensis sp. nov. (P1. Ⅰ, figs. 1, 2)Material: Only two specimens representing this species.Diagnosis: Pyramid large, rhomboidal in transverse section, with shallow corner grooves or longitudinal ridges; faces bearing simple small transverse ridges, with 5—7 of them in a distance of 10 mm, mostly opposite to each other on beth sides of furrow; ridges and furrow with small transverse line; mid-line lacking.Comparison: This species is similar to Conularia niagarensis Hall (Moore, 1956, p. 59, fig. 46-3), but the latter is quadrangular in section with more transverse ridges, and net-like tubercles.Age and Distribution: Corniah, Late Triassic, Hanwang Formation. North-western parts of Sichuan Basin.Conularia maantangensis sp. nov. (P1. Ⅰ, fig. 3)Material: Only one specimen representing the species.Diagnosis: Pyramid medium-sized; rhombic in transverse section; face bearing uniform transverse ridges, with 10—11 in a distance of 10 mm.Comparison: This species is similar to C. sichuanensis sp. nov., but the former is rhombic in transverse section and lacks a small transverse line.Age and Distribution: Carnian, Late Triassic, Hanwang Formation. Northwestern parts of Sichuan Basin.更多还原