Balizoma

Balizoma is a genus of trilobites from the family Encrinuridae established by David J. Holloway in 1980.[1] It has only been found in rocks of Silurian age. Its type species, B. variolaris (Brongniart, 1822), is currently the only named species of the genus, and is found in England. The neotype of B. variolaris was collected from the Much Wenlock Limestone Formation at Dudley, West Midlands.[2] That specimen was first illustrated in Sir Roderick Impey Murchison's classic book, The Silurian System.[3] B. variolaris was the original "strawberry-headed" trilobite of Dudley, so-named because of its nodular glabellar tubercles, and well known to early trilobite collectors.[4] Additional species were originally assigned to Balizoma, but were subsequently placed in other encrinurine genera.[5][6]

Balizoma
Temporal range: Silurian
Balizoma variolaris fossil; neotype of the type species
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Trilobita
Order:
Phacopida
Family:
Encrinuridae
Genus:
Balizoma
Species
  • †B. variolaris

References
  1. Holloway, David J. (1980). "Middle Silurian trilobites from Arkansas and Oklahoma, U.S.A." Palaeontographica Abteilung A. 170: 1–85.
  2. Tripp, R. P.; Temple, J.T.; Gass, K.C. (1977). "The Silurian trilobite Encrinurus variolaris and allied species, with notes on Frammia". Palaeontology. 20 (4): 847–867.
  3. Murchison, Roderick Impey (1839). The Silurian System. London: John Murray. p. 726.
  4. Tripp, R. P.; Temple, J.T.; Gass, K.C. (1977). "Calymene variolaris Brongniart, 1822 (Trilobita): Proposed use of the plenary powers to designate a neotype in harmony with current use. Z.N.(S.) 2189" (PDF). Bulletin of Zoological Nomenclature. 33 (3&4): 250–252.
  5. Ramskold, Lars (1986). "Silurian encrinurid trilobites from Gotland and Dalarna, Sweden" (PDF). Palaeontology. 29 (3): 527–575.
  6. Edgecombe, Gregory D.; Chatterton, Brian D. E. (1993). "Silurian (Wenlock-Ludlow) encrinurine trilobites from the Mackenzie Mountains, Canada, and related species". Palaeontographica Abteilung A. 229: 75–112.


  • Balizoma in the Paleobiology Database
  • Listing of Balizoma variolaris neotype in Online Collections at University of Birmingham registry.
  • Listing in Official Lists and Indexes of Names and Works in Zoology, 1987 (page 307)]
  • Listing in Official Lists and Indexes of Names and Works in Zoology, Supplement 1986-2000 (page 131)



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