Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Nanorthis
Classification
Phylum:
Brachiopoda
Class:
Rhynchonellata
Order:
Orthida
Superfamily:
Orthoidea
Family:
Nanorthidae
Formal Genus Name and Reference:
Nanorthis Ulrich & COOPER, 1936b, p. 621
Type Species:
Orthis hamburgensis WALCOTT, 1884, p. 73, OD
Images
(Click to enlarge in a new window)
Fig. 537, 1a-d. *N. hamburgensis (Walcott), Tremadoc, western USA, $a$, dorsal exterior, $\\mathbf{X}_{3}$, $b$, ventral exterior, $\\mathbf{X}_{3}$, $c$, dorsal interior, $X_{4}$, $d$, ventral interior, $X_{4}$ (Ulrich & Cooper, 1938).
Synonyms
Evenkinorthis
Geographic Distribution
cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Lower Ordovician (Tremadoc)
Ending International Stage:
Tremadocian
Fraction Up In Ending Stage:
100
Ending Date:
477.08
Description
Subcircular with obtuse cardinal extremities, ramicostellate, short, bladelike brachiophores, notothyrial platform rudimentary, lacking cardinal process.