Hedstroemia (trilobite)

Hedstroemia is a genus of trilobites in the order Proetida known from the Silurian period of Europe, Asia, and North America.[1]

Hedstroemia
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Proetida
Family: †Proetidae
Genus: †Hedstroemia
Pribyl and Vanek, 1978
Type species
Proetus delicatus
Hedström, 1923
Synonyms

Milesdavis Lieberman, 1994 Pachyproetus Lutke, 1990

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.[2] 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.[1]

Species

Several species of Hedstroemia are recognized, and other species are questionably assigned to the genus.[1] Species names with the authority in parentheses were originally described as a different genus.

  • H. delicatus (Hedström, 1923)
  • H. eldredgei (Lieberman, 1994)
  • H. kulchini Ludvigsen & Tripp, 1990
  • H. pachydermata (Barret, 1878)
  • H. planedorsata (Schmidt, 1894)
  • H. sourdoughi Ludvigsen & Tripp, 1990
  • H. sugiharensis (Kobayashi & Hamada, 1974)
  • H. weedoni Adrain, 1997

Questionable species

  • ?H. channahonensis (Weller, 1907)
  • ?H. zlichovianus (Pribyl, 1966)
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gollark: These are continuous distributions, so there's technically an infinitesimal probability that it's any particular value (handwavily) but you can integrate over a region of it to determine the probability that a sample falls within that region.
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References
  1. Adrain, Jonathan M. "Proetid trilobites from the Silurian (Wenlock-Ludlow) of the Cape Phillips Formation, Canadian Arctic Archipelago". Palaeontographia Italica. 84: 21–111.
  2. Lieberman, B. S. (1994). "Evolution of the trilobite subfamily Proetinae Salter, 1864, and the origin, diversification, evolutionary affinity, and extinction of the Middle Devonian proetid fauna of eastern North America". Bulletin of the American Museum of Natural History (223): 1–176.


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