Secondary shell units make up the outermost of these zones and also fill many of the pore canals.
2.
"Polyclonoolithus " is distinctive for having branching shell units, with irregular pore canals between them.
3.
Its pore canals are lined with parallel filaments; the morphology of the pore canal is a key trait used to delineate species within the genus.
4.
Its pore canals are lined with parallel filaments; the morphology of the pore canal is a key trait used to delineate species within the genus.
5.
The two oospecies are primarily distinguished by their pore structure . " P . zhuangqianensis " has pores which all connect to each other in irregular patterns; the walls of the pores are separated into disconnected blocks . " P . xiaxishanensis ", on the other hand, has well-separated pore canals which look like a honeycomb in cross-section.
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