Eurypterid-associated fauna of Wilhelmi Fmn. at Essex, Illinois (Silurian of the United States)

Where: Illinois (41.2° N, 88.2° W: paleocoordinates 22.2° S, 55.4° W)

• coordinate based on nearby landmark

When: Wilhelmi Formation, Llandovery (443.4 - 433.4 Ma)

Environment/lithology: open shallow subtidal; argillaceous dolomite

• "The formation is considered to be peritidal by Droste & Shaver (1983) [Ind. G.S.Spec.Rept.32]. The brachiopods suggest a BA 3 Janius Community Group assignment, i.e. subtidal, photic zone. It is not known, however, whether the eurypterid was associated with the brachiopods or interbedded in strata that may represent another environment."

•SEP environmental call based on given information and regional context

• "Dolomite, commonly argillaceous"

Primary reference: R. E. Plotnick. 1999. Habitat of Llandoverian-Lochkovian eurypterids. In A. J. Boucot, J. D. Lawson (eds.), Paleocommunities - a case study from the Silurian and Lower Devonian 106-136 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 13853: authorized by Michael Foote, entered by Michael Foote on 29.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita indet. Walch 1771 trilobite
 Xiphosurida - Onychopterellidae
? Onychopterella pumilis eurypterid
"According to E. Kjellesvig-Waering (oral comm., 1979) this may be a Drepanopterus."
 Lophophorata -
Tentaculitida indet. Ljaschenko 1955
 Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
 Athyridida - Rhynchospirinidae
Homoeospira sp. Hall and Clarke 1893
 Athyridida - Meristellidae
Whitfieldella sp. Hall and Clarke 1893
 Pentamerida - Gypidulidae
Gypidula sp. Hall 1867
 Atrypida - Atrypidae
Atrypa sp. Dalman 1828
 Rhynchonellida - Trigonirhynchiidae
Rhynchotreta sp. Hall 1879
 Rhynchonellida - Camarotoechiidae
Camarotoechia sp. Hall and Clarke 1893
 Rhynchonellida - Rhynchonellidae
Rhynchonella sp. Fischer 1809
Given as "Rhynchonella"
 Orthida - Rhipidomellidae
Rhipidomella sp.
Given as "Rhipidomella"
 Orthida - Dalmanellidae
Dalmanella sp. Hall and Clarke 1892
 Orthida - Plectorthidae
Hebertella sp. Hall and Clarke 1892
 Craniopsida - Craniopsidae
Craniops sp. Hall 1859
Bivalvia indet. Linnaeus 1758 clam
Gastropoda indet. Cuvier 1797 snail
 Cornulitida - Cornulitidae
Cornulites sp. Schlotheim 1820
Anthozoa indet. Ehrenberg 1834