【摘要】 对陕南西乡化石库发现的马哈螺类化石和棱管壳类化石做了统计和描述,补充了马哈螺类新的属征,建立新种西乡拟鳞锥Ramentoides xixiangensis sp. nov.。马哈螺和棱管壳表面装饰存在差异,并非同一物种上掉落的骨片,本文展示的马哈螺新的特征与"骨针壳"假说存在矛盾,马哈螺在形态上表现出软体动物单板类最原始的特征,而棱管壳则与halkieriids存在密切的亲缘关系。本文报道了马哈螺类化石的新形态,丰富了对马哈螺类和棱管壳类的认识,对确立马哈螺和棱管壳的亲缘关系和分类位置提供了新的材料。更多还原

【Abstract】 The fossils of maikhanellid and siphogonuchitids found in the Cambrian Xixiang Lagerst?tten in South Shaanxi Province, China were statistically described, and the new characteristics of maikhanellid genera was added. A new species Ramentoides xixiangensis sp. nov. is described in this paper. The surface decoration of maikhanellid and siphogonuchitids is different and they are not the fallen bone slices from the same species. The new characteristics of maikhanellid are contradictory to the "spicule-shell" hypothesis. The maikhanellid exhibits the most primitive characteristics of molluscs in morphology, while the siphogonuchitids has close affinity with halkieriids. This paper reports the new morphology of maikhanellid, enriches the knowledge of maikhanellid and siphogonuchitids, and provides new material for establishing the relationship and systematic position of maikhanellid and siphogonuchitids.更多还原