Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Reconstruction of the Fossil Mud Shrimp Callianopsis Clallamensis

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

This Article is currently unavailable for purchase.
Add to Favorites
You must be logged in to use this functionality

Cover image Placeholder

AbstractCheliped parts of the fossil mud shrimp Callianopsis (Callianassa) clallamensis (Thalassinidea) were first recovered in the mid-nineteenth century from Oligocene marine rocks at Clallam Bay on the northern coast of the Olympic Peninsula, Washington State and described in 1924 as Callianassa clalllamensis. A second species, C. twinensis, was identified in 1926 from cheliped pieces found in rocks of similar age in the Twin Rivers area 20 kilometers southeast of Clallam Bay. Both fossil localities are in the Pysht formation of the Twin River Group. In 1997 these two species were reassigned to Callianopsis, and C. clallamensis is now recognized as the male and C. twinensis as the female of that species. An extensive collection of this fossil thalassinidean at the Burke Museum, University of Washington, particularly in calcite-cemented concretions, and commonly as disassociated parts, contains almost all anatomical hard-parts of the species. Study of this collection has made it possible to render a nearly complete morphological reconstruction of both the male and female of the species and to compare these specimens to the holotype, as well as photographs and original diagrams of varied specimens. This composite confirms sexual dimorphism and close morphological similarity to the extant species Callianopsis goniophthalma that lives at slope depths from the Gulf of Alaska to Baja California, Mexico. Sedimentary and paleontological features indicate that the fossil mud shrimp-bearing strata were deposited in upper slope to bathyal water depths.

Affiliations: 1: The Burke Museum of Natural History and Culture, University of Washington, Box 353010, Seattle, Washington 98195-3010, U.S.A. (


Full text loading...


Data & Media loading...

1. Berglund R. E., Goedert J. L. 1992 "A new species of Cancer (Decapod: Brachyura) from the Miocene Astoria Formation in Washington." Thomas Burke Memorial Washington State Museum Contributions in Anthropology and Natural History Vol 9 1 11
2. Brown R. D.Jr., Gower H. D. 1958 "Twin River Formation (redefinition), northern Olympic Peninsula, Washington." American Association of Petroleum Geologists Bulletin Vol 42 2492 2512
3. de Saint Laurent M. 1973 "Sur la systématique et la phyogénie des Thalassinidea; Définition des families des Callianassidae et des Upogebiidae, cinq genres nouveaux (Crustacea Decapoda)." Comptes Rendus Hebdomadaires des Seances de l'Académie des Sciences, Paris, série D Vol 277 513 516
4. Dragovich J. D., Logan R. L., Schasse H. W., Walsh T. J., Lingley W. S.Jr., Norman D. K., Gerstel W. J., Lapen T. J., Schuster J. E., Meyers K. D. 2002 "Geologic Map of Washington – Northwest Quadrant." Washington Division of Geology and Earth Resources Geologic Map GM-50, 72 p. 3 sheets, scale 1: 250,000
5. Hart J. F L. 1982 "Crabs and their relatives of British Columbia." British Columbia Provincial Museum Handbook Vol 40 54 55
6. Manning R. B., Felder D. L. 1991 "Revision of the American Callianassidae (Crustacea: Decapoda: Thalassinidea)." Proceedings of the Biological Society Washington Vol 104 764 792
7. Rathbun M. J. 1902 "Descriptions of new decapod crustaceans from the west coast of North America." Proceedings of the United States National Museum Vol 24 885 905
8. Rathbun M. J. 1904 "Decapod crustaceans of the northwest coast of North America." pp. 154-156, and pl. VIII. In, Vol. 10, Crustaceans. Harriman Alaska Expedition. Doubleday, Page, and Company
9. Rathbun M. J. 1926 "The fossil stalk-eyed Crustacea of the Pacific slope of North America." United States National Museum Bulletin Vol 138 114 117 Pl. 26-27
10. Rau W. W. 1964 "Foraminifera from the Northern Olympic Peninsula, Washington." Geological Survey Professional Paper Vol 374-G G1 G33
11. Schweitzer Hopkins C., Feldmann R. M. 1997 "Sexual dimorphism in fossil and extant species of Callianopsis de Saint Laurent." Journal of Crustacean Biology Vol 17 236 252
12. Snavely P. D.Jr., Niem A. R., Pearl J. E. 1978 "Twin River Group (upper Eocene to lower Miocene)–Defined to include the Hoko River, Makah, and Pysht Formations, Clallam County, Washington." U.S. Geological Survey Bulletin Vol 1457-A 111 120
13. Withers T. H. 1924 "Some decapod crustaceans (Callianassa and Ranina) from the Oligocene of Washington State, U.S.A." Annals and Magazine of Natural History Vol 14 121 127

Article metrics loading...



Can't access your account?
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation