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The biggest species in the assemblage, with the large specimens of this
trilobite get to be 25 cm (10 inches) long. Redlichia takooensis is
also found in the Lower Cambrian of South China. Scale bar = 2 cm. |
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Occasionally, some specimens preserve appendages. This fossil has the left
antenna preserved. The left lateral cephalic border runs from top right corner
to bottom left corner. The crescent-shaped structure on the right hand margin,
near the bottom, is the eye. A pleuron can be seen bottom right. Field of view
= 4 cm. |
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Hsuaspis is the most common element of the fauna. This trilobite is
also found in the Flinders Ranges of South Australia, in New South Wales and in
Antarctica. The genus was first described from the Lower Cambrian of South
China.. It appears to have affinities with Xystridura from the Middle
Cambrian based on ontogenetic studies. This specimen shows abundant iron oxide,
some of which has altered to limonite. Scale bar = 5 mm. |
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This is a juvenile specimen (Meraspid 10 - of 12). By finding several meraspid
stages it has been possible to measure the growth patterns during ontogeny and
compare them to other otogenetic patterns. Using this, is appears that Hsuaspis
is ancestral to Xystridura. The meraspids possess a pair of long genal
spines on the head and a pair of long pleural spines on the second thorasic
segment - which are greatly reduced in the adult. Scale - width of image = 4
mm. |
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Naraoia is a soft bodied trilobite in which the body covering has not
subdivided, resulting in a two part exoskeleton composed of the cephalic and
thoracic shields. Specimen is 2 cms long. |
