摘要
本文描述的新笔石——多枝中华反向笔石(Sinodiversograptus multibrachiatus gen.etsp.nov.),是最近笔者之一(陈旭)同曹瑞骥、刘第墉、张太荣等同志调查四川北部地层时,在南江县桥亭附近的下志留统Spirograptus turriculatus带中采得的。这种笔石的标本很多,保存在风化退色的黑色页岩中。页岩大都变成浅棕色或粉红色,而笔石则保存为黑色碳质薄膜,相当清楚。从一系列不同发育阶段的标本,可以看出此种笔石的发育过程。这种笔石体的发育过程,不论对研究单笔石科的幼枝发育问题,或者对于研究这个新属及其相近的属如反向笔石属(Diversograptus)和捲笔石属(Streptograptus)等的演化关系,都是相当重要的。
The new graptolite Sinodiversograptus multibrackiatus gen.et sp.nov.described in the present paper was recently secured by Messrs.R.J.Cao,T.Y.Liu,T.Y.Zhang and one of the writers(Chen)from the Spirograptus'turriculatus zone of the Lower Silurian at Qiaoting of Nanjiang district during their geological excursion to northern Sichuan(Szechuan)province.This species is represented by numerous specimens preserved in a bleached black shale.Based on a series of specimens in various stages in development of rhabdosome,the developmental process of this new graptolite may be recognized.This dcvelopmental process is of considerable importance to the mode of development.of the sicular and thccalcladiaand to thc evolutionary relation betweer'the new genus Sinodiversograptus and its related genera such as Diversograptus and Streptograptus.
作者
穆恩之
陈旭
A.T.MU;X.CHEN(Institute of Geology and Palaeontology,Academia Sinica)
出处
《古生物学报》
1962年第2期143-157,共15页
Acta Palaeontologica Sinica
