论Finospirifer的形态源流

来源期刊：中南大学学报(自然科学版)1987年第3期

论文作者：区元任 尹仲科

文章页码：237 - 242

关键词：古生物学； 动物化石； 石燕目； 腕足动物； 遗传变差； 物种类源； 分类学； 形态特征；鳍石燕；赵氏弓石燕；中槽壳线程式

Key words：paleontology； animal fossil； spiriferida； brachiopoda； genetical variance； sources of species； taxonomy； morphological characteristics；Finospirifer；Cyrtospirifer chaoi；formulae of sinual costae

摘    要：本文叙述腕足动物石燕类Finospirifer(鳍石燕)属的特殊性状在分类中的意义,并试用中槽壳线程式、生成顺序及其它特性分析比较Cyrtospirifer chaoi(赵氏弓石燕)与Finospirifertaotangensis(陶塘鳍石燕)的形态特征,阐述两者在形态演变中的遗传与变异的关系,认为前者可能是后者的直系亲型。

Abstract: Since 1931, Amadeus W. Grabau convinced that the nature, the formality and the appearing order of the sinual costae are the striking characteristcs for taxonomy about his so called "Spirifer (Sinospirifer)". And then he proposed to use his sinual formulae to classify the species and mutations for his subgenus. Here, we adopt A. W. Grabau’s viewpoint to trace the morphological derivation of genus Finospirifer. It is quite interesting to note that the sinual formulae of Finospirifer laolancjeusis (type species of Finosirifer) and Cyrtospirifer chaoi are much alike. The basic sinual formulae of both are 2+I+2, 3+I+3, 4+I+4 and etc. Furthermore, after we studied the other characteristcs, the ontogenesis of both and examined the references about their geological ranges, their distributive localities, we have drawn the following pertinent inference: Finospirifer taotangensis is assumed to be the heredity of Cyrtonpirifer chaoi morphologically.