Parvibellus is an extinct genus of panarthropod animal known from the Cambrian of China. It is known from only a single species, P. atavus, found in the Cambrian Stage 3 aged Chengjiang Biota of Yunnan, China.
In the original description, The trunk appendages were interpreted as swimming flaps, which suggest a nektonic life style and close relationship with stem-group such as the "gilled " Kerygmachela and Pambdelurion, opabiniids and radiodonts. However, recent research suggests it may instead be a larval Lobopodia, a group of benthic lobopodian nest within arthropod stem-group, and the trunk appendages were re-interpreted as stout lobopods. Since it may represent the larva of any described siberiids from the same strata (e.g. Megadictyon, Jianshanopodia) and cannot be accurately identified, Parvibellus is considered to be a nomen dubium.
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