A new maikhanellid genus, Totornatus gen. nov., from the Lower Cambrian(Fortunian Stage) of Zhangjiagou section at Xixiang County, southern Shaanxi Province, South China, is based on a new taxon T. strigatus gen. et s...A new maikhanellid genus, Totornatus gen. nov., from the Lower Cambrian(Fortunian Stage) of Zhangjiagou section at Xixiang County, southern Shaanxi Province, South China, is based on a new taxon T. strigatus gen. et sp. nov. Although showing similar morphology with a cap-shaped shell and an oval aperture to other members of the family, the new species differs from previous maikhanellids in its smooth apex. The apical field consists of dense, small, round or oval granules, which gradually merge to bigger, elongated, scale-like protrusions toward the apertural margin. On this basis, we establish Totornatus strigatus, which shows a transverse groove in two-ninths of its shell. This result enriches the diversity of the earliest mollusks and maikhanellids.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 41872014, 41572007 and 41572009)the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No.XDB26000000)+3 种基金the State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences (Grant No.193123)the Basic Research Plan of Natural Science of Shaanxi Province (Grant No.2018JM4002)the Student Innovation Project of Chang’an University (No.202010710458)the 12th ‘Challenge Cup’ competition of Chang’an University (No.D-P-B-1)。
文摘A new maikhanellid genus, Totornatus gen. nov., from the Lower Cambrian(Fortunian Stage) of Zhangjiagou section at Xixiang County, southern Shaanxi Province, South China, is based on a new taxon T. strigatus gen. et sp. nov. Although showing similar morphology with a cap-shaped shell and an oval aperture to other members of the family, the new species differs from previous maikhanellids in its smooth apex. The apical field consists of dense, small, round or oval granules, which gradually merge to bigger, elongated, scale-like protrusions toward the apertural margin. On this basis, we establish Totornatus strigatus, which shows a transverse groove in two-ninths of its shell. This result enriches the diversity of the earliest mollusks and maikhanellids.
