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Medientyp:
E-Artikel
Titel:
Additional Garden City (Early Ordovician) Trilobites
Beteiligte:
Ross,, Reuben James
Erschienen:
Society of Economic Paleontologists and Mineralogists and the Paleontological Society, 1953
Erschienen in:Journal of Paleontology
Sprache:
Englisch
ISSN:
0022-3360;
1937-2337
Entstehung:
Anmerkungen:
Beschreibung:
<p>Continued study on the silicified trilobites of the Garden City formation of Utah has resulted in the discovery and description of the new genus Psalikilopsis and of the new species P. cuspidicauda Ross, Scinocephalus quadrihastatus Ross, Menoparia lunalata Ross, Pseudohystricurus orbus Ross, and Licnocephala ovata Ross. The derivation of Menoparia from Apatokephalus is suggested by the change in its dorsal furrows throughout its stratigraphic range, and problematical meraspid pygidia are described for the genotype. The presence of a peculiar rostral structure in Dimeropygiella is established. Bathyurid affinities of Licnocephala are suggested by the presence of a rostral plate and elongate, dorsally directed appendifers on the hypostome; the concept of this genus is broadened to include three species showing considerable variation in cranidial features.</p>