对宜昌黄花场大湾组下段牙形石Oepikodus evae带至Baltoniodus triangularis 带系统采集与分析几丁虫样品,共发现几丁虫6属12种,其中包括1个相似种、1个未定种,它们是Conochitina raymondii, C. ordinaria, C. primitiva, C. langei, C. brevis, C. poumoti, C. decipiens, Belonechitina cf. micracantha, Lagenochitina esthonica, L. sp., Eremochitina baculata和Cyathochitina dispar等.根据上述几丁虫的地质和地理分布特征,自下而上可划分为Conochitina langei带和Eremochitina baculata带,讨论并指出了他们与相关笔石、牙形石生物带的关系.