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LATEST EARLY TO EARLY MIDDLE DEVONIAN TRILOBITES FROM THE ERBENOCHILE BED, JBEL ISSOUMOUR, SOUTHEASTERN MOROCCO
BRIAN D. E. CHATTERTON and STACEY GIBB
Journal of Paleontology
Vol. 84, No. 6 (NOVEMBER 2010), pp. 1188-1205
Published by: Paleontological Society
Stable URL: http://www.jstor.org/stable/40925991
Page Count: 18
You can always find the topics here!Topics: Exoskeletons, Paleontology, Thorax, New species, Tridents, Emsian age, Eifelian age, Eyes, Holotypes, Geology
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A bed on Jbel Issoumour, near Alnif in southeastern Morocco, contains numerous complete trilobites. The bed is located stratigraphically at the base of the El Otfal Formation, immediately above a cliff-forming resistant unit known to local trilobite miners as the 'grand calcaire', and is latest Emsian or early Eifelian in age. The fauna exhibits an alpha trilobite diversity of at least eight species, including Erbenochile issoumourensis n. sp., Acanthopyge (Lobopyge) bassei n. sp., and Walliserops lindoei n. sp. The absence of lateral palpebrai extensions in E. issoumourensis but their presence in the type species of Erbenochile, E. erbeni, when considered with other differences in the exceptionally large eyes of both species, supports the hypothesis that these palpebrai structures functioned as eyeshades in E. erbeni but not in E. issoumourensis. Walliserops lindoei has a short, stout haft at the base of the trident anterior cephalic projection, which is the most characteristic feature of Walliserops. This projection in Walliserops primarily functioned as a deterrent to predators.
Journal of Paleontology © 2010 Paleontological Society