Hedstroemia (trilobite)

Hedstroemia is a genus of trilobites in the order Proetida known from the Silurian period of Europe, Asia, and North America.
Taxonomic history.
The genus "Hedstroemia" was named in 1978. The type species designated was "Hedstroemia delicatus", which had originally been described as "Proetus delicatus" in 1923. In 1990 the subgenus "Pachyproetus" was proposed to accommodate a single species, "P. pachydermata." In 1994, the genus "Milesdavis" was proposed based on incomplete fossils consisting of the pygidium (rear segment) of three individuals. The genus was named after musician Miles Davis, and the type species, "Milesdavis eldredgei", was named in honor of the paleontologist Niles Eldredge. In 1997, "Milesdavis" and the subgenus "Pachyproetus" were recognized as junior synonyms of "Hedstroemia", by paleontologist Jonathan Adrain, who regarded the type species of both as ingroup "Hedstroemia". 
Species.
Several species of "Hedstroemia" are recognized, and other species are questionably assigned to the genus. Species names with the authority in parentheses were originally described as a different genus.
Questionable species