贵州关岭地区三叠系竹杆坡组顶部及"瓦窑组"底部的牙形刺

贵州关岭地区三叠系“瓦窑组”以N.polygnathiformis繁盛为特征,关岭新铺巴毛林至小洼一带“瓦窑组”一段与杨守仁等（1995）Neogondolella polygnathiformis带的下部相当,相当于卡尼阶。“瓦窑组”中N.polyg-nathiformis(Budurov et Stefanov)的幼年期个体丰富,为研究这一晚三叠的重要属种的个体发育提供条件,在该区竹杆坡组上部发现的Celsigondolella baiyunensis sp.nov.和Neogondolella parafoliata sp.nov。为研究Celsigon dolella与Neogondolella这间的演化关系提供新材料。     

TRIASSIC CONODONTS FROM ZHUGANPO AND “WAYAO” FORMATIONS OF GUANLING, SOUTHWEST CHINA

ＳＹＳＴＥＭＡＴＩＣＰＡＬＥＯＮＴＯＬＯＧＹＧｅｎｕｓＣｅｌｓｉｇｏｎｄｏｌｅｌｌａＫｏｚｕｒ ,196 8　　Ｔｙｐｅｓｐｅｃｉｅｓ　Ｇｏｎｄｏｌｅｌｌａ (Ｃｅｌｓｉｇｏｎｄｏｌｅｌｌａ)ｗａｔｚｎａｕｒｉＫｏｚｕｒ ,196 8Ｃｅｌｓｉｇｏｎｄｏｌｅｌｌａｂａｉｙｕｎｅｎｓｉｓｓｐ .ｎｏｖ .(ＰｌａｔｅⅠ ,ｆｉｇｓ .1— 5 )　　Ｅｔｙｍｏｌｏｇｙ　ＮａｍｅｄｆｒｏｍｉｔｓｏｃｃｕｒｒｅｎｃｅｉｎＢａｉｙｕｎｓｅｃｔｉｏｎ ,Ｇｕｉｚｈｏｕ .Ｄｉａｇｎｏｓｉｓ　ＡｒｅｐｒｅｓｅｎｔａｔｉｖｅｏｆＣｅｌｓｉｏｇ…     

Observations on the surface microreticulation of platform elements of Neogondolella (Conodonta) from the Upper Permian, Meishan, China

Specimens of the platform element of Neogondolella from the Upper Permian of the Meishan section show well-developed polygonal microsculpture on their oral surfaces, attributable to the imprints of secreting cells. In all populations studied, there is a small but significant increase of mean polygon size with element size, but no variation in polygon size related to position on the element. There is a difference in mean polygon size between the two species N. changxingensis and N. deflecta , but this appears merely to reflect the larger mean size of elements of the latter species. No evidence for periodicity of polygon size during ontogeny is detected. The population of N. changxingensis in Bed 24e is dominated by small specimens with a mean polygon size smaller than on equivalent-sized elements in the normal population of Bed 24d; this suggests that the 'dwarf' population reflects a combination of high juvenile mortality and retarded cell growth.