REVIEW OF THE CLASSIFICATION OF THE FAMILY AFROGRAPTIDAE (CRUSTACEA: CONCHOSTRACA)
REVIEW OF THE CLASSIFICATION OF THE FAMILY AFROGRAPTIDAE (CRUSTACEA: CONCHOSTRACA)
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发表时间：
2003
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通讯作者：
Shen Yan
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作者：
Shen Yan
叶肢介化石生长线上的锯齿状结构被认为是叶肢介科的一个重要特征。一些活体的扫描电镜照片表明，在生长线上有一排刚毛。生长线的刚毛关节被折断，而它们的插入物仍然存在，这形成了一个明显的锯齿边缘沿着外部模具中的化石标本的生长线。生长线上的刚毛为环状，无刚毛，可能起感觉作用。这种结构在现生叶肢介3科7属32种和化石22属中发现。在非洲笔石科中，多条放射状肋和瓣上的粗瘤比锯齿状结构更重要，在分类学上具有较高的地位。本文提出了非洲笔石科的一个订正系统。这个科可以更好地放在亚目Estherielliina，而不是在Estheritina。
Serration structure on the growth lines of the fossil conchostracans was considered as a key character for the family Afragraptidae. SEM micrographs of some living forms indicate that there is a row of setae on the growth lines. Setal articulations of the growth lines are broken off while their insertions remain, which form an apparently serration margin along the growth lines for the fossil specimens in the external mold. The setae of the growth lines belong to annulate type without setules and probably played in sensory function. This structure was found from about 32 species in seven genera of three families for the living conchostracans and 22 fossil genera. Multi radiating costae and stout tubercles on the valves are much more important than that of serration structure in high taxonomic status for the family Afrograptidae. An emended scheme of the Afrograptidae is presented herein. This family can be better placed in the suborder Estherielliina, rather than in the Estheritina.