摘要
本文报道新藻属(Nuia)在我国的发现。标本采自天津蓟县雾迷山组二十里铺亚组。该亚组广泛发育条带状黑色燧石,其中富含保存完好和形态多样的新藻属(Nuia)。经鉴定,计1属,1新种:Nuia pelucidus sp. nov.,这一发现为我们提供了关于Nuia属地质和地理分布的新的古生物学资料。
The present paper is a report of the discovery of Nuia in China. The specimens were collected from the Ershilipu Subformation of The Wumishau Formation in Jixian County, Tianjin. Black banded cherts extensively developed in this Subtormation contain abundant Nuia which is well preserved and variable in form. Nnia pelucidus sp. nov. is identified.
The present discovery provides new data about the geological and geographical distribution of this genus.
Chlorophyta
Chlorophyceae
Siphonales
Cordiaceae
Nuia Maslov, 1954, emend, Toomey et Klement, 1966 Type species Nuia siberica Maslov, 1954
Nuia pelucidus sp. nov, Zhang (Plate Ⅰ, figs. 1—7)
Diagnosis Curved siliceous tubes, having a distinctive dark central canal. Central canal composed of cryptocrystalline quartzin, wall composed of hyaline microquartz, radially arranged around the central canal, Walls two-layered, arranged concentri-cally or eccentrically. Tubes across are ovoid, spindle, and subspherical. Tube 1000μm in length; outer walls have a short diameter of 80—280μm, averaging 196μm(N=10)and a long diameter of 163—415μm, averaging 276μm(N=10). Central canal has a short diameter of 35-150μm averaging 79μm(N=10)and a long diameter of 50—300μm, averaging 159μm(N=10).
Comparison In general morphology, the specimen is similar to that of Nuia siberica Maslov, 1954, from the Ust'Suite(Lower Ordovician)of Irkutsk Provinces Siberia, U. S. S. R. But as the central canal is large in size and outer walls are thinner. it is different from the known species of the genus.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第2期183-185,共3页
Geological Review
