Mazon Creek Fossil Fauna
Arthropods
Spiders and Spider-like Arachnids
Paratarbus carbonarius - Petrunkevitch, 1945
Paratarbus carbonarius, Field Museum collection
Field Museum collection
Phalangiotarbus lacoei - Scudder, 1890
Phalangiotarbus lacoei - R.Rock Collection, Figure 44.2 The Mazon Creek Fossil Fauna 2012
Above and below: Phalangiotarbus lacoei, Pit 3, Wilmington, IL - D.Pond collection
Above and below: Phalangiotarbus lacoei, Pit 2, Wilmington, IL - A.Young collection
Architarbus rotundatus - Scudder, 1868
Architarbus rotundatus, Mazon River, Morris, IL - P.Anderson collection (photo by P.Anderson)
Above: Architarbus rotundatus, showing details, Mazon River, Morris, IL - P.Anderson collection
Hadrachne horrobilis
Geralinura carbonaria - Scudder, 1884
Whip Scorpion
Geralinura carbonaria, Mazon River, Morris, IL - K.Robitschek collection
Geralinura carbonaria (positive and negative halves)
Graephonus carbonarius - Scudder, 1876
Graeophonus carbonarius, Pit 3, Wilmington, IL - R.Holm collection (photos by R.Holm)
Amarixys (Curculiodes) sulcata - Melander, 1903
Above and below: Amarixys (Curculiodes) sulcata - R.Rock collection
R.Rock collection
Amarixys (Curculiodes) sulcata - Field Museum collection
Amarixys (Curculiodes) sulcata, Mazon River, Morris, IL - D.Douglass collection
Polichera glabra - Petrunkevitch, 1913
Arthrolycosa antigua - Harger, 1874
True Spider
Arthrolycosa antigua, a true spider having spinnerets for producing silk - D.Douglass collection
Anthracomartus trilobitus - Scudder, 1884
Above and below: Anthracomartus trilobitus, showing abdomen geometry, Pit 3, Wilmington, IL - A.Young collection
Below: full concretion showing peculiar shape and almost septarian-like splitting. It opened upon washing after collection.
Pleophrynus ensifer - Petrunkevitch, 1945
Nemastomoides longipes - Petrunkevitch, 1913
Daddy Longlegs
Unnamed Anthracomartid
Unnamed anthracomartid abdomen, Pit 11, Braidwood, IL - A.Young collection
Douglassarachne acanthopoda - Selden and Dunlop, 2024
Above and below: Douglassarachne acanthopoda, Pit 15, Essex, IL - Field Museum and the David and Sandra Douglass Collection.
A new species of spiny arachnid (2024), its exact placement in an arachnid Order is uncertain. One half of the fossil concretion is on view at the Douglass Collection Prehistoric Life Museum in Evanston, Illinois.
A new species of spiny arachnid (2024), its exact placement in an arachnid Order is uncertain. One half of the fossil concretion is on view at the Douglass Collection Prehistoric Life Museum in Evanston, Illinois.