贵州关岭生物群海百合Traumatocrinus的再研究

在前人的研究基础上,通过对大量新发掘的贵州关岭地区晚三叠世海百合化石标本的再研究,肯定了Trauma-tocrinus的有效性。根据目前的材料,认为该属只有1个有效种,即Traumatocrinushsui;而根据化石的埋藏学特征,认为幼年体Traumatocrinushsui营假浮游生活,成年体是否能够适应底栖生活环境尚需进一步证实。

许氏创孔海百合Traumatocrinus hsui的形态定量分析和个体发育过程

Traumatocrinus hsui Mu,1949是关岭生物群的重要组成成员,以数量众多、保存精美、营假浮游生活闻名于世。笔者等通过对5件群体保存标本中的127个大小不同个体的系统描述和形态定量分析,认为T.hsui萼部与整个冠部存在异速生长的特征,个体发育过程中腕的级数和数目逐渐增加;T.hsui的个体发育可分为3个时期6个阶段,即幼年期(Ⅰ、Ⅱ)、少年期(Ⅰ、Ⅱ、Ⅲ)、成年期;幼年期:个体较小,冠高小于26 mm,腕分枝至4级;少年期:个体中等,冠高26~130 mm,腕分枝至7级;成年期:个体较大,冠高大于130 mm,腕分枝至8级。前人在关岭生物群中研究命名的Traumatocrinus hsui enormis Mu,1949,Traumatocrinus kueichouensis Mu,1949,Traumatocrinus uniformis Mu,1949,Traumatocrinus sp.Mu,1949,Traumatocrinus guanlingensis Yu et al.,2000和Traumatocrinus xinpuensis Wang et al.,2002等均为T.hsui的同种异名,其命名标本为个体发育的不同阶段或局部特征。

Ontogeny of the Traumatocrinus hsui

It is suggested that the characters of Traumatocrinus hsui Mu infants change remarkably in different ages;however,the characters of adult individuals are comparatively stable.The present study examined specimens of infant and adult individuals of T.hsui.Based on these observations,the authors divided the ontogeny of T.hsui into four infant stages（infant stageⅠ-Ⅳ）and one adult stage.In addition,the characters of the anal pyramid are supplemented and the infrabasal plates of T.hsui are confirmed in the present paper for the first time.