Data from: The bivalved arthropod Tuzoia from the Balang Formation (Cambrian Stage 4) of Guizhou, China, and new observations on comparative species

Tuzoia is a large, bivalved Cambrian arthropod having a widespread
distribution in shallow-shelf to deeper marine Lagerstätten;
stratigraphically it ranges from Cambrian Series 2 through the Miaolingian
Series. In the present study, three species are recognized from relatively
deep-water deposits of the Balang Formation (Cambrian Stage 4) of Guizhou,
South China: Tuzoia sinensis Pan, 1957, T. bispinosa Yuan et Zhao, 1999
and T. lazizhaiensis sp. nov. The new species is unique in having 6-10
small marginal spines on the dorsal margin, an inflated anterior margin
with 3 short, closely spaced marginal spines. These remains, which usually
occur as disarticulated valves, are inferred to be parautochthonous. One
new specimen of T. lazizhaiensis shows a stalked eye and antenna. New
Tuzoia material from the Kaili Biota (Cambrian: Wuliuan Stage) of Guizhou,
and from the Guanshan Biota (Cambrian Stage 4) of Yunnan, China, provide
additional comparative information about the genus. Some new specimens of
T. bispinosa from the Kaili Biota provide information on valve morphology
and palaeoecology. One specimen of T. sinensis from the Guanshan Biota
provides information on the appendages, and one specimen of T. tylodesa,
from the Guanshan Biota adds provides information on the trunk and
appendages.