Triplicatella opimus: Redescription of a Orthothecid Hyolith from the early Cambrian Chengjiang Lagerstätte.
[sciencythoughts.blogspot.com]
Hyoliths are a group of extinct Palaeozoic marine animals, which possessed distinct conical calcareous shells and range in age from the early Cambrian through to the Permian. The group was one of the first Bilaterians to acquire shells and rapidly became one of the most abundant and cosmopolitan biomineralising animals in Cambrian strata. Hyoliths are subdivided into two distinct groups, Hyolithida and Orthothecida, based on a number of morphological differences. Typical Hyolithids have a four-part external skeleton, including a conical conch with a ligula, an externally fitting operculum, and a pair of curved helens that resemble oars. Orthothecids on the other hand only have two parts, a conch without a ligula and a retractable operculum. Well-preserved Hyoliths with articulated opercula are abundant in the Chengjiang Lagerstätte. Seven species of Hyoliths have been previously recorded; however, these species are difficult to define based on previous descriptions.
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