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

Epilogue to the tale of the Triassic amphipod: Rosagammarus McMenamin, Zapata and Hussey, 2013 is a decapod tail (Luning Formation, Nevada, USA)

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

M. A. S. McMenamin and colleagues described a unique crustacean fossil from the Triassic Luning Formation in west-central Nevada as a new genus and species of amphipod, Rosagammarus minichiellus McMenamin, Zapata and Hussey, 2013. The amphipod identity caused an over-150-million-year ghost range connecting R. minichiellus with the next-oldest fossil amphipods in Eocene amber. The amphipod identity nevertheless failed to stand up to closer scrutiny. Additional preparation of the fossil, coupled with examination using polarized light and electron microscopy revealed that many podomere boundaries of the original interpretation were either artifacts of incomplete exposure of the fossil, or they represented places where the fossil arthropod cuticle had flaked off. The polarized light showed the weathered remnants of the cuticle to be more extensive than originally realized. Examination with a scanning electron microscope and energy-dispersive X-ray analysis showed the cuticle to be at least partially replaced with silica in stark contrast to the calcium carbonate matrix. Elemental mapping revealed that some supposed boundaries between adjacent legs actually had a strong silica signal, suggesting that the silica-replaced cuticle continues beneath the matrix connecting the two legs laterally. The amphipod identity for R. minichiellus is therefore rejected. The fossil is instead proposed to represent the right half of a tail belonging to a lobster-like decapod, with two broad, flat, uropods preserved. Other decapods are known from the Luning Formation, but none with enough detail to meaningfully compare with R. minichiellus. The relatively broad ecological distribution of decapods does not shed any new light on the unique paleoecology of the Luning Formation.

Affiliations: 1: 1Department of Geology, Western Illinois University, Macomb, IL 61455, USA ; 2: 2Department of Geology and Geography, Mount Holyoke College, South Hadley, MA 01075, USA

*Corresponding author; e-mail:

Full text loading...


Data & Media loading...

1. Ahyong S. T. 2009. "The polychelidan lobsters: phylogeny and systematics (Polychelida: Polychelidae)", pp.  369-396. In, Martin J. W. , Crandall K. A. , Felder D. L. (eds.), Decapod Crustacean Phylogenetics. CRC Press, Boca Raton, FL.
2. Audo D. , Charbonnier S. , Schweigert G. , Saint Martin J.-P. . 2014. "New eryonid crustaceans from the Late Jurassic Lagerstätten of Cerin (France), Canjuers (France), Wattendorf (Germany) and Zandt (Germany)". Journal of Systematic Palaeontology Vol 12: 459-479.
3. Bottjer D. J. 2002. "Berlin-Ichthyosaur: preserving some of the Earth’s largest marine vertebrates", pp.  243-250. In, Bottjer D. J. , Etter W. , Hagadorn J. W. , Tang C. M. (eds.), Exceptional Fossil Preservation. Columbia University Press, New York, NY.
4. Bousfield E. L. 1977. "A new look at the systematics of gammaroidean amphipods of the world". Crustaceana (Supplement) Vol 4: 282-316.
5. Charbonnier S. , Garassino A. . 2012. "The marine arthropods from the Solnhofen Lithographic Limestones (Late Jurassic, Germany) in the collections of the Muséum national d’Histoire naturelle (Paris)". Geodiversitas Vol 34: 857-871.
6. Charbonnier S. , Garassino A. , Schweigert G. , Simpson M. . 2013. A Worldwide Review of Fossil and Extant Glypheid and Litogastrid Lobsters: (Crustacea, Decapoda, Glypheoidea). Publications Scientifiques du Muséum national d’Histoire naturelle, Paris.
7. Förster R. 1967. "Die reptanten dekapoden der trias". Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen Vol 128: 136-193.
8. Garassino A. , Bravi S. . 2003. " Palaemon antonellae new species (Crustacea, Decapoda, Caridea) from the lower Cretaceous “Platydolomite” of Profeti (Caserta, Italy)". Journal of Paleontology Vol 77: 589-592.<0589:PANSCD>2.0.CO;2
9. Garassino A. , Teruzzi G. . 1993. "A new decapod crustacean assemblage from the Upper Triassic of Lombardy (N. Italy)". Paleontologia Lombarda (Nuova Serie) Vol 1: 1-27.
10. Garassino A. , Teruzzi G. . 1995. "Studies on Permo-Trias of Madagascar. 3. The decapod crustaceans of the Ambilobè region (NW Madagascar)". Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano Vol 134: 85-113.
11. Garassino A. , Teruzzi G. , Dalla Vecchia F. M. . 1996. "The macruran decapod crustaceans of the Dolomia di Forni (Norian, Upper Triassic) of Carnia (Udine, NE Italy)". Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano Vol 136: 15-60.
12. Hogler J. A. 1992a. Community structure, paleoecology, and depositional environments within the Upper Triassic Luning Formation of Nevada. Ph.D. Thesis, University of California at Berkeley, Berkeley, CA.
13. Hogler J. A. . 1992b. "Taphonomy and paleoecology of Shonisaurus popularis (Reptilia: Ichthyosauria)". Palaios Vol 7: 108-117.
14. Macdonald K. S. III , Yampolsky L. , Duffy J. E. . 2005. "Molecular and morphological evolution of the amphipod radiation of Lake Baikal". Molecular Phylogenetics and Evolution Vol 35: 323-343.
15. McMenamin M. A. S. , Orr L. , Minichiello R. , Zapata L. P. , Hussey M. C. . 2013a. "Supergiant Triassic crustacean from Nevada: the oldest known amphipod". Geological Society of America Abstracts with Programs Vol 45: 845.
16. McMenamin M. A. S. , Zapata L. P. , Hussey M. C. . 2013b. "A Triassic giant amphipod from Nevada, USA". Journal of Crustacean Biology Vol 33: 751-759.
17. Schram F. R. 1971. " Litogaster turnbullensis (sp. nov.): a Lower Triassic glypheid decapod crustacean from Idaho". Journal of Paleontology Vol 45: 534-537.
18. Van Straelen V. 1936. "Sur des crustacés décapodes triasiques du Nevada". Bulletin du Musée Royal d’Histoire Naturelle de Belgique Vol 12: 1-7.
19. Weitschat W. , Wichard W. . 2010. "Baltic amber", pp.  80-115. In, Penney D. (ed.), Biodiversity of Fossils in Amber From the Major World Deposits. Siri Scientific Press, Manchester.

Article metrics loading...



Can't access your account?
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation