中国科学院南京地质古生物研究所机构知识库

Re-examination of the type specimens of the conchostracan genus Abrestheria using a scanning electron microscope (SEM) has revealed details of carapace features of important taxonomic value, which have not been described hither-to. The new characteristics include: (1) small-sized reticulations on growth lines near the umbo; (2) serrated lower margins of growth lines; (3) punctae in the even lurnina of reticulations; and (4) tubercles at the lower ends of the claviform radial lirae on the growth bands of the lower parts of the carapace. Consequently, the diagnosis of Abrestheria is revised, and a discussion is also made concerning relationships between Abrestheria and closely related genera, such as Eosestheriopsis, Eosestheria and Orthestheria, which have important biostratigraphic implications.