Hyoliths are abundant and globally distributed ‘shelly’ fossils that appear early in the Cambrian period and can be found throughout the 280 million year span of Palaeozoic strata. The ecological and evolutionary importance of this group has remained unresolved, largely because of their poorly constrained soft anatomy and idiosyncratic scleritome, which comprises an operculum, a conical shell and, in some taxa, a pair of lateral spines (helens).
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/hyoliths-are-palaeozoic-lophophorates
[2] http://admin.indiaenvironmentportal.org.in/category/author/joseph-moysiuk
[3] http://admin.indiaenvironmentportal.org.in/category/author/martin-r-smith
[4] http://admin.indiaenvironmentportal.org.in/category/author/jean-bernard-caron
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossils
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/life-science
