【摘要】 <正> 标本很多,保存完好。笔石体细长,呈圆柱形,两侧平行,始端在正面较圆;反面则较尖削。笔石体长达30毫米以上;宽仅0.1—0.3毫米。在立体标本中宽度较窄,保存为薄膜的标本则宽一些。缝合线清楚而相当完整。微呈波形的中轴伸出体外4毫米。在有的标本上,中轴及缝合线呈现出三条清楚的纵线。更多还原

【Abstract】 Diplograptidae Lapworth,1873Pseudoclimacograptus Pribyl,1947Pseudoclimacograptus demittolabiosus Geh(sp.nov.)(Pl.Ⅵ,figs.21—24;Pl.Ⅲ,figs.1—8)The specimens of this new species are very well preserved.The rhabdosome is about 18 mm in length and 1-1.1 mm in width. The proximal end is rounded and possessesa short virgella and two basal spines. The sicula is small, measuring 0.75 mm in lengthand 0.1 mm in width. Its apex reaches to the level of the third pair of the thecae.The proximal thecae are very slender, only ! mm long, 6 times as long as wide. Thedistal ones arelarger. They are measured 1.47 mm in length, 9 times as long as wide.The thecae number 11-12 in 10 mm. They overlap one-third to two-fifths. Thegeniculum of the ventral wall forms a lip-like structure.’更多还原