Discovery of important taxonomic characters of the type species of the Late Triassic clam shrimp Anyuanestheria (Crustacea: Spinicaudata) from Jiangxi
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Abstract:
Re-examination of the type specimens of the clam shrimp type species Anyuanestheria subquadrata Zhang and Chen in Zhang et al., 1976 using a scanning electron microscope (SEM) has revealed details of carapace characters that are of important taxonomic value. These characters have hitherto never been documented. The new characters include medium to large polygonal reticulations on growth bands on the dorsal part of the carapace. Two types of ornaments are present on the growth bands of the ventral and posterior parts of the carapace: fine and widely spaced radial lirae on the upper part and medium to large reticulations on the lower part of each growth band. The walls of the polygonal reticulations are thin with shallow depressions, resulting in flat polygonal protrusions on the external mould. This ornamentation pattern is different from the original description. Based on these observations, the diagnosis of Anyuanestheria is emended.
