Entomaspis

Entomaspis is an extinct genus of harpetid trilobite from Upper Cambrian to Early Ordovician marine strata of the United States. Species are typified by their proportionally large, vaulted, croissant-shaped or bonnet-shaped cephalons that have the cheeks freed to become elongated, curved librigenial spines, and by their comparatively large, crescent-shaped eyes (in comparison with other eyed harpetids).

Entomaspis
Temporal range: Upper Cambrian-Earliest Ordovician
E. radiata
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Harpetida
Family: †Entomaspididae
Genus: †Entomaspis
Ulrich, 1931
Type species
Entomaspis radiata
Ulrich, 1931
Species
  • E. bridgei Rasetti 1952
  • E. clarki Raymond 1937
  • E. radiata Ulrich, 1931
  • E. rawi (Ross, Jr. 1951)

Species

E. bridgei

E. bridgei is a species found in marine strata of Missouri.

E. clarki

E. clarki is a species found in Lower Ordovician marine strata of Vermont.[1]

E. radiata

E. radiata is the type species, and is found in Uppermost Cambrian and Lowermost Ordovician marine strata of Utah. It coexisted sympatrically with E. rawi.

E. rawi

E. rawi was originally described as Hypothetica rawi, and coexisted with E. radiata in Lowermost Ordovician marine strata of Utah.[2]

References
  1. Shaw, Alan B. "Paleontology of Northwestern Vermont. XII. Fossils from the Ordovician Highgate Formation." Journal of Paleontology (1966): 1312-1330.
  2. Moore, R.C. (1959). Arthropoda I - Arthropoda General Features, Proarthropoda, Euarthropoda General Features, Trilobitomorpha. Treatise on Invertebrate Paleontology. Part O. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. pp. 1–560, 419. ISBN 0-8137-3015-5.

Sources


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