Parvibellus

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.

Morphology

Parvibellus is small panarthropod with length of around. The head bore a pair of small frontal appendages and ventrally directed circular mouth. There is no evidence that Parvibellus had eyes. The elongated trunk possesses 11 pairs of lateral appendages and a pair of terminal projections.
In the original description, The trunk appendages were interpreted as swimming flaps, which suggest a nektonic life style and close relationship with stem-group arthropods such as the "gilled lobopodians" Kerygmachela and Pambdelurion, opabiniids and radiodonts. However, recent research suggests it may instead be a larval siberiid, a group of benthic lobopodians nested 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 and cannot be accurately identified, Parvibellus is considered to be a nomen dubium.