CAJ | 학술논문

叶肢介化石生长线下缘锯齿状构造曾作为非洲叶肢介科(Afrograptidae)分类的主要特征, 通过扫描图像, 从比较解剖学研究入手, 揭示了现生与化石叶肢介壳瓣的锯齿构造是由于分布于生长线的一排刚毛, 基部关节脱落而形成的; 分析了生长线刚毛的形态是属于长针形的轴刚毛, 主要司触角功能; 在5科18属现生叶肢介中, 至少3科7属32种具有生长线刚毛, 22属化石叶肢介有锯齿构造; 作者认为这一构造被视为非洲叶肢介科分类的主要依据是不合适的,壳瓣的放射褶或粗瘤构造在高级分类上更重要, 进而对该科的含义进行了厘定; 从壳瓣具有多条放射褶这一构造特征来看, 它与小叶肢介超科(Estheriellioidea)的成员在发生关系上比较密切, 小叶肢介超科可提升为亚目(Estheriellina), 包括小叶肢介超科和非洲叶肢介超科, 是中生代初兴起的一个类群, 在白垩纪中期消失.
협지개화석생장선하연거치상구조증작위비주협지개과(Afrograptidae)분류적주요특정, 통과소묘도상, 종비교해부학연구입수, 게시료현생여화석협지개각판적거치구조시유우분포우생장선적일배강모, 기부관절탈락이형성적; 분석료생장선강모적형태시속우장침형적축강모, 주요사촉각공능; 재5과18속현생협지개중, 지소3과7속32충구유생장선강모, 22속화석협지개유거치구조; 작자인위저일구조피시위비주협지개과분류적주요의거시불합괄적,각판적방사습혹조류구조재고급분류상경중요, 진이대해과적함의진행료전정; 종각판구유다조방사습저일구조특정래간, 타여소협지개초과(Estheriellioidea)적성원재발생관계상비교밀절, 소협지개초과가제승위아목(Estheriellina), 포괄소협지개초과화비주협지개초과, 시중생대초흥기적일개류군, 재백성기중기소실.
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.