新疆准噶尔盆地西缘晚泥盆世一种新的石松类植物  

A NEW LYCOPSID CONE FROM THE UPPER DEVONIAN OF WESTERN JUNGGAR BASIN, XINJIANG, CHINA

作　　者：徐洪河[1] 王怿[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》2002年第2期251-258,共8页Acta Palaeontologica Sinica

基　　金：国家重点基础研究发展规划项目 (No .G2 0 0 0 0 7770 0 );国家自然科学基金 (Nos.49972 0 0 5 ;49972 0 0 8)

摘　　要：描述新疆和布克赛尔晚泥盆世洪古勒楞组中的一种石松类孢子囊穗 ,该孢子囊穗二歧分叉一次 ,长纺锤形叶座紧密螺旋排列于穗轴上 ,每轮 6枚 ;孢子叶披针形 ,具叶柄 ,单脉 ,叶缘具细齿 ;孢子囊近轴处着生 ,长椭球形 ,囊内有 4枚大孢子 ;大孢子圆球形 ,表面光滑 ,直径为 90 0— 12 0 0 μm。通过对比研究 ,将当前孢子囊穗定为新属、新种 ,即Hefengistrobusbifurcusgen .etsp .nov .,同时讨论该孢子囊穗在石松类演化上的意义。The late Middle and Late Devonian is a transitional period between the first appearance of lycoposid (Late Silurian and Early Devonian) and the acme of the diversity and evolution (Carboniferous). The study on the lycopsid, especially cones, in the Upper Devonian is significant. In China, the lycopsid is a dominant fossil plant group during Middle and Late Devonian. In this paper, a new fossil cone of lycopsid is described. The fossil plants were collected from the Hongguleleng Formation at the Gannaren, Hobuksar Menggol Autonomous County, the western Junggar Basin, Xinjiang, China. Based on the study of fossil plants, brachipods, acritarchs and spores, the geological age of the plant bearing bed is likely to be Upper Devonian (Famennian). The description of this new fossil cone is as follows: Division Lycopsida Order, Family Incertae sedis Genus Hefengistrobus gen. nov. Derivation hefeng the Chinese spelling, referring to the former name of the locality Hobuksar. strobus Latin, the cone. Type species Hefengistrobus bifurcus gen. et sp. nov. Diagnosis Heterosporous lycopsid plant. Cone dichotomizing at least one time. Sporophyll bases tightly and helically arranged at cone axis, long fusiform in outline. Each whorl with 6 sporophylls. Sporophyll, lanceolate, with a short stalk and single vein, consisting of a lamina with dentate margins, associated with a single adaxial sporangium. Megasporangia elliptic in outline and without pedicel. Each sporangium with four megaspores. Occurrence Late Devonian, Junggar Basin, Xinjiang, China. Hefengistrobus bifurcus gen . et sp. nov . (Pl. Ⅰ, figs.1—9; Pl. Ⅱ, figs.1—10) Holotype PB19245, Plate Ⅰ, fig. 6. Paratypes PB19244A, PB19244B, Plate Ⅰ, figs. 2, 3; PB19247A, PB19247B, Plate Ⅱ, figs. 1, 2. Derivation bifurcus Latin, bifurcate, referring to the cone dichotomizing at least one time. Diagnosis As stated in the diagnosis of the genus. Cone dichotomizing at least one time at angle of 45°—65°, a

关 键 词：石松植物 孢子囊穗 晚泥盆世 新疆 准噶尔盆地 

分 类 号：Q914[天文地球—古生物学与地层学]