Assertion: lobe's surface | /r/HasProperty | dorsal
Facets:
Source sentences:
text: The exoskeleton is composed of calcite and calcium phosphate minerals in a lattice of chitin that covers the upper surface (dorsal) of the trilobite and curled round the lower edge to produce a small fringe called the "doublure".Three distinctive tagmata (sections) are present: cephalon (head); thorax (body) and pygidium (tail).