贵州凯里生物群中软舌螺的初步研究

本文描述了采自贵州台江县革东镇八郎中寒武世凯里生物群中的软舌螺化石，计有1种，3相似种和1个未定种。即：Ambrolinevitus cf.ventricosus,Glossolites?sp..Haplophrentis?cf.carinatus,Linevitus opimus,Hyolithes?cf.cariniferus.凯里生物群中软舌螺特点是：1)壳体通常较大，呈宽锥形；2)背、腹壳区分明显，常具中槽或中脊；3)特别是以软舌螺目中的软舌螺科和线带螺科的软舌螺保存数量最多。完全与欧洲、北美相当层位中出现的软舌螺组合面貌相似；并与澄江动物群中的软舌螺在演化特征上是可衔接的。凯里生物群中的软舌螺除具有世界性属种外。还具地区特有的属种。这对研究软舌螺的地理分布、演化进程以及与凯里生物群组合关系有重要意义。

PRELIMINARY RESEARCH ON HYOLITHIDS FROM THE KAILI BIOTA, GUIZHOU

The present paper deals with the hyolithids collected from the Kaili Biota of the Middle Cambrian at the Miaobanpo section in Taijiang County, Guizhou. The hyolithid fossils described here belong to 4 families and 5 genera, including 1 species, 3 affiliated species and 1 indeterminate species: Ambrolinevitus cf. ventricosus, Glossolites ? sp., Haplophrentis? cf. carinatus, Linevitus opimus, Hyolithes? cf. cariniferus . Most hyolithid conchs are large and broad cone like with large divergence angles. Abundant Haplophrentis ? cf. carinatus and Hyolithes ? cf. cariniferus occur in the Kaili Biota, constituting the most important part of the hyolithids in the fauna. Most hyolithids from the Kaili Biota are similar to those in North America and Europe. The hyolithids of the Kaili Biota not only include worldwide genera and species but also contain local ones. They can provide important material for studying geographical distributions and evolution of the Middle Cambrian hyolithids.